Total 4,942 field engineer job vacancies in Engineering category in Singapore

About the role

We are hiring a Senior Site Reliability Engineer to help make k-ID reliable at scale.

This role sits in the middle of our production backbone. You will own and improve the systems that keep our platform available, observable, secure, and resilient as traffic grows and our client base expands globally. You will work across infrastructure, tooling, deployment workflows, incident response, and systems design to make sure we can scale without breaking.

This is not a ticket closing operations role. We want someone who can look at a system, find the weak points, and harden it. Someone who cares about failure modes, blast radius, deployment safety, recovery time, cost discipline, and the realities of running production systems under pressure. You should be comfortable writing code, automating away toil, and partnering closely with engineers to improve reliability through better architecture and better operating practices.

Responsibilities

• Own the reliability, availability, and performance of the systems behind k-ID’s platform and public APIs

• Design and improve scalable infrastructure on AWS and Kubernetes that can support high growth, uneven traffic, and global production workloads

• Build and maintain strong observability across logs, metrics, tracing, alerting, and service health so issues are caught early and investigated quickly

• Improve deployment safety through better CI and CD workflows, release controls, rollback paths, and environment consistency

• Drive incident response and production readiness practices, including runbooks, on call hygiene, postmortems, capacity planning, and resilience testing

• Reduce operational toil by automating repetitive work and improving internal tooling for developers and operators

• Partner with engineering teams to embed reliability and operability into service design from the start, not after something fails in production

• Strengthen platform security and infrastructure hygiene across access controls, secrets handling, system hardening, and production safeguards

• Continuously improve system performance, resource efficiency, and cost awareness without compromising reliability

Qualifications

• 5+ years of experience in infrastructure, platform engineering, site reliability engineering, or software engineering with meaningful production ownership

• Strong experience running production systems in AWS

• Strong hands on experience with Kubernetes and container based workloads

• Experience with infrastructure as code, preferably Terraform

• Experience designing and operating observability stacks using tools such as Prometheus, Alertmanager, Grafana, OpenTelemetry, or equivalent systems

• Strong understanding of distributed systems, failure modes, service reliability, and production debugging

• Experience building or improving CI and CD systems and release workflows in modern engineering environments

• Ability to write code and automation in one or more languages such as Go, Python, or TypeScript

• Good judgment during incidents and a practical mindset around tradeoffs, risk, and recovery

• Clear written and verbal communication skills with the ability to work effectively in a remote team

• Startup experience is a plus, especially in environments where systems and processes are still being built

About the Role 

We are seeking a meticulous and technically competent Site Engineer to support our project delivery team in a role centred on Deviation and Anomaly Report (DAR) submissions, site inspections, and close liaison with LTA Qualified Persons Supervising (QPS) and site teams. The ideal candidate brings solid site engineering experience, a thorough understanding of LTA's regulatory and submission frameworks, and a proactive approach to quality and compliance management on active civil infrastructure projects. 

Key Responsibilities 

• Prepare, coordinate, and submit Deviation and Anomaly Reports (DARs) to LTA in a timely, accurate, and well-documented manner in accordance with LTA's submission protocols and requirements.

• Monitor and track all open DARs throughout their lifecycle — from initial identification and submission through to LTA review, response, and formal close-out.

• Compile and organise all supporting documentation for DAR submissions including photographs, drawings, calculations, method statements, and inspection records.

• Liaise with the design team, QPS, and LTA representatives to obtain necessary technical inputs, clarifications, and endorsements required for DAR submissions.

• Conduct regular and systematic site inspections to monitor construction activities, verifying conformance with approved drawings, specifications, method statements, and LTA requirements.

• Prepare and maintain detailed site inspection records, non-conformance reports (NCRs), and corrective action logs in accordance with the project quality management system.

• Administer and manage Inspection and Test Plans (ITPs), coordinating hold points and witness points with LTA's QPS and Employer's Representative (ER) for timely review and sign-off.

• Ensure all inspection and site activities are conducted in full compliance with Workplace Safety and Health (WSH) regulations and the project's Safety Management Plan. 

Requirements 

• Bachelor's degree in Civil Engineering, Structural Engineering, Construction Engineering, or a related engineering discipline.

• Professional registration with PEB Singapore or working towards PE registration is an advantage.

• Demonstrated site engineering experience on construction or civil infrastructure projects, with a focus on quality management, regulatory submissions, and authority liaison.

• Hands-on experience preparing and managing DAR submissions, NCRs, and ITP administration on LTA or equivalent infrastructure projects is strongly preferred and will be a significant advantage.

• Prior experience in direct liaison with LTA QPS, ER teams, or equivalent statutory authority representatives on active construction projects.

• Experience on LTA projects (e.g., MRT, LRT, road, tunnel, underground infrastructure, or bus interchange) is strongly preferred.

• Strong working knowledge of LTA's DAR submission processes, quality management systems, and regulatory compliance frameworks.

• Proficiency in reading and interpreting civil, structural, and architectural construction drawings and specifications.

• Familiarity with ITP administration, holdpoint and witness point management, and NCR close-out processes in an LTA project context.

  If interested, please submit your application to cvs@jdawms.com with your expected salary and resume.

  We regret that only short-listed candidates will be contacted shortly. By submitting your application or resume, you agree to the collection, use, retention, and sharing of your personal information with potential employers for their assessment.

  JDA WMS Pte Ltd | EA Personnel: Pham Thi Tuyet Mai

  EA License No: 23S1595 | EA Registration No: R25127838

  
  

About ST Engineering

ST Engineering is a global technology, defence, and engineering group with offices across Asia, Europe, the Middle East, and the U.S., serving customers in more than 100 countries. The Group uses technology and innovation to solve real-world problems and improve lives through its diverse portfolio of businesses across the aerospace, smart city, defence, and public security segments. Headquartered in Singapore, ST Engineering ranks among the largest companies listed on the Singapore Exchange.

Our history spans more than 50 years, and our strategy is underpinned by our core values – Integrity, Value Creation, Courage, Commitment and Compassion. These 5 core values guide every aspect of our business and are embedded in our ST Engineering culture – from the people we hire, to working with each other, to our partners and customers.

About our Line of Business – Cloud & Data Centre Solutions

ST Engineering Cloud and Data Centre Solutions Pte Ltd provide all aspects of cloud management, services, and solutions, from initial setup and migration to ongoing operations and optimization. Services include engineering works to design, build and provide facility management service for mission critical environments such data centres, disaster recovery, and business continuity sites.

Together, We Can Make A Significant Impact

This position involves being responsible for providing deep technical expertise to ensure the safety, reliability, and optimal performance of electrical infrastructure within the data centre. This role establishes engineering standards, supports operations teams, oversees preventive and corrective maintenance, and ensures all electrical systems meet performance and regulatory requirements. The individual will need to work effectively as part of a team and communicate professionally with colleagues, supervisors and customers.

Be Part of Our Success 

• Serve as the primary technical authority for all electrical systems in the data centre.
• Establish and maintain electrical engineering standards, technical guidelines, and best practices.
• Provide technical consultancy during design reviews, upgrades, troubleshooting, and incident investigations.
• Conduct risk assessments, system performance reviews, and technical audits.
• Oversee and validate maintenance programs for electrical equipment such as:
• High/Low Voltage switchgear
• UPS systems and batteries (VRLA/Li-ion)
• Generators and fuel systems
• PDU/RPP/STS/busway systems
• Earthing, bonding, and lightning protection
• Ensure accurate preventive and corrective maintenance execution by in-house teams and vendors.
• Monitor system health, capacity, performance trends, and operational risks.
• Drive improvements in electrical system uptime, resilience, and redundancy.
• Lead root cause analyses (RCA) for electrical incidents and develop corrective/preventive action plans.
• Maintain Single-Line Diagrams (SLDs), asset documentation, and operating procedures.
• Support electrical load studies, failure mode analysis, and lifecycle management.
• Participate in electrical design reviews and approve engineering drawings, schematics, and test plans.
• Support construction, fit-out, and system upgrade projects as the electrical technical expert.
• Lead or participate in FAT, SAT, IST, and system validation activities.
• Ensure all new installations meet technical, safety, and uptime requirements.
• Ensure compliance with applicable standards and codes (e.g., IEEE, IEC, NFPA, local electrical regulations).
• Conduct safety reviews and enforce electrical safety requirements including LOTO and PTW systems.
• Maintain up-to-date documentation, reports, electrical studies, and audit records.

Qualities We Value

• Bachelor’s Degree in Electrical Engineering or equivalent.
• At least 5 years of experience in data centre, mission-critical, or industrial electrical engineering.
• Expertise in UPS, switchgear, generators, power distribution, grounding, and protection systems.
• Experience with redundancy models (N, N+1, 2N) and Tier requirements.
• Strong analytical, diagnostic, and problem-solving skills.
• Ability to interpret electrical schematics and engineering drawings.
• Strong vendor management and project coordination capabilities.
• Excellent communication and technical documentation skills.

Our Commitment That Goes Beyond the Norm

• An environment where you will be working on cutting-edge technologies and architectures.
• Safe space where diverse perspectives are valued, and everyone’s unique contributions are celebrated.
• Meaningful work and projects that make a difference in people’s lives.
• A fun, passionate and collaborative workplace.
• Competitive remuneration and comprehensive benefits.

This is a full-time, on-site Designer role based in Singapore. The Designer will support related projects by interpreting drawings, preparing detailed design layouts, and translating technical requirements into practical solutions for building materials and systems. Day-to-day tasks include reviewing project specifications, coordinating with project managers and sales teams, and proposing design details that optimize the use of glazing sealants, fire-stop systems, and related products. The role involves producing clear drawings and sketches, recommending suitable materials and finishes, and collaborating with contractors and site teams to resolve design issues during installation. The Designer will also assist in site measurements, mock-ups, and quality checks to ensure designs are feasible, safe, and aligned with client requirements and company standards.

Qualifications

• Diploma or equivalent in Architecture, Engineering, Construction, or related field; relevant certificates are an advantage.
• Familiarity with construction materials, building systems, and site practices; experience with glazing or fire-stop systems is a plus.
• Proficiency in design or drafting software (e.g., AutoCAD or similar) and basic MS Office skills.
• Strong attention to detail, problem-solving skills, and the ability to coordinate with cross-functional teams and external stakeholders.
• Ability to work on-site and occasionally attend site visits, measurements, and inspections across Singapore.

At LionsBot, we build autonomous robots that combine perception, localization, and decision-making to operate safely and intelligently in real-world environments. Our embodied AI systems go beyond simulation, delivering robust autonomy that interacts seamlessly with people and dynamic surroundings.

The Role

Join our Autonomy team to design and deploy perception and visual SLAM pipelines that power our next generation of robots. You’ll work across sensor calibration, algorithm development, and embedded optimization, collaborating with navigation, mapping, and hardware engineers to deliver integrated autonomy stacks for fleet deployment.

Key Responsibilities

• Design, develop, and deploy autonomy stacks for mobile robots.

• Build and improve SLAM, localization, mapping, path planning, and navigation systems
• Work with ROS / ROS 2 to integrate autonomy pipelines across perception, planning, and control
• Develop and tune robot behavior in real-world indoor and outdoor environments
• Integrate sensors such as LiDAR, IMU, depth cameras, wheel encoders, and GPS where applicable
• Improve robustness in dynamic, cluttered, and partially observable environments
• Debug autonomy issues related to mapping drift, localization loss, obstacle handling, and route planning
• Collaborate with mechanical, electrical, and software teams to bring robots from prototype to deployment
• Evaluate system performance through testing, field trials, and continuous iteration

Requirements

● Bachelor’s in Computer Science, Robotics, Electrical Engineering, or related field.

● 0–3 years’ robotics/computer vision experience or exceptional academic projects.

● Proficient in C++17+ and Python on Linux.

● Experience with ROS/ROS2 and sensor calibration.

● Hands-on with perception or SLAM pipelines.

● Familiarity with OpenCV, PCL, and basic deep learning frameworks.

Nice to Have

● Embedded/ARM optimization experience.

● Knowledge of GTSAM, Ceres, or g2o.

● Experience with semantic mapping or modern tracking frameworks.

Why Join Us

At LionsBot, you won’t just write code —you’ll put intelligence into machines that move through and understand the real world. You’ll see your work come alive on fleets of robots, solving problems no one has tackled before. Here, you’ll shape the future of embodied AI, grow alongside some of the brightest minds in robotics, and build technology that redefines what autonomous systems can do.

Job Description:

1. Meeting technical specification requirement, interpretation of class rules to address to review comment, testing procedure, short-circuit verification, familiar with elect standard compliance for oil and gas and knowledge in Integrated Automation System (IAS).

2. Document preparation and review for single line drawing, evaluation of electrical load analysis, power plant, switchboards, Variable frequency drive, starters panel, power distribution, alarm monitoring, Fire protection, PAGA, navigation, communication and others for diesel electric vessel.

3. Develop drawing list, cable termination drawing, cable list , cable tray sizing , breakers sizing, control console and preparing of testing protocol according to building schedule.

4. Require system integration skills to liaise among vendors of electrical power management systems, power plant, propulsion, IAS, equipment suppliers while meeting FMEA compliance for dynamic positioning and check on harmonic distortion.

5. This position is required to be full-time based in Indonesia, Batam.

Requirements:
1. Bachelor degree in electrical engineering or diploma in marine engineering
2. At least 5 years relevant working experience in shipyard or in marine electrical field
3. Proficiency in AutoCAD
4. Good computer skills
5. Understand shipbuilding and project processes. Able to comprehend the technical specification and discuss projects with customers.
6. Analytical ability
7. Communication skills
8. Interpersonal skills
9. Able to work in Batam, Indonesia Full time

Job Description

• Responsible for integration and implementation of both hardware and software engineering work
• Carry out proper planning, execution and supervision of the integration work and do QA technical checks throughout the project execution
• Handle application programme change management, hardware deployment management and documentation
• Implementation of PLC/SCADA project from concept to design and programming
• Interface with SCADA and PLC programming
• Meeting with clients, doing reports and documentation
• Perform troubleshoot independently

Requirements

• Min Nitec in Mechatronics, Electrical or Electronics
• Possess a Singapore Class 3 or 3A Driving License
• knowledge in PLC and SCADA

To submit your application, please apply online apply@rn-care.com or call +(65) 6514 9838 for private and confidential discussion.

Your interest will be treated with the strictest of confidence. We regret that only shortlisted candidates will be notified or contacted.

RN Care Pte. Ltd
EA License No: 17C8900

We are seeking a highly skilled Senior Process Integration Engineer to lead the development and optimization of Indium Phosphide (InP) based Edge Emitting Lasers (EELs). In this role, you will be the bridge between design and manufacturing, ensuring that our high-performance optoelectronic devices transition from concept to high-volume production with world-class reliability and yield.

You’ll be working at the frontier of photonics, handling complex material systems and sophisticated fabrication sequences to power the next generation of optical communications and sensing technologies.

Core Responsibilities

• Process Flow Ownership: Design, implement, and manage the full end-to-end fabrication flow for InP-based EELs (e.g., Fabry-Pérot, DFB, and DBR lasers).
• Yield & Performance Optimization: Identify and resolve integration bottlenecks. Use Statistical Process Control (SPC) and Design of Experiments (DOE) to improve device electro-optical performance (threshold current, wall-plug efficiency, and slope efficiency).
• Cross-Functional Collaboration: Partner with Epitaxy (MOCVD) teams to optimize regrowth interfaces and with the Design team to ensure Layout-to-Mask integrity.
• Advanced Fabrication Management: Oversee critical steps including dry/wet etching (ICP/RIE), dielectric deposition (PECVD/ALD), metallization etc.
• Failure Analysis: Coordinate Root Cause Analysis (RCA) on fabrication failures using SEM, TEM, and FIB diagnostics to drive continuous improvement.

Key Technical Requirements

• Materials Expertise: Deep understanding of III-V compound semiconductors, specifically the GaAs/InP/InGaAsP/material systems.
• Device Physics: Strong grasp of semiconductor laser physics
• Fabrication Proficiency: Hands-on experience or good understanding on photolithography, etching, thin film
• Characterization:  Understanding laser characterization data and correlating results back to specific process modules.

Qualifications

• Education: PhD or Master’s degree in Electrical Engineering, Physics, Materials Science, or a related field.
• Experience: 5+ years of direct experience in III-V semiconductor processing
• Software: Proficiency in JMP, or Python for data analysis;
• Mindset: A methodical troubleshooter who thrives in a cleanroom environment and enjoys the "detective work" of process integration.

Description

We are seeking an AI Engineer with strong hands-on experience in Microsoft Azure AI services to design, develop, and deploy AI-powered solutions. The role focuses on leveraging Azure-native AI capabilities, data services, and machine learning tools to build scalable and production-ready intelligent systems.

Key Responsibilities

Design and implement AI solutions using Azure AI services

Build and deploy machine learning / AI models on Azure cloud

Develop APIs and services to integrate AI capabilities into enterprise applications

Work with structured and unstructured data for model training and inference

Collaborate with business and technical teams to define AI requirements

Deploy, monitor, and optimize AI solutions in Azure environments

Ensure performance, scalability, and reliability of AI systems

Support troubleshooting and enhancement of existing AI solutions

Required Skills & Experience

Hands-on experience with Microsoft Azure AI / Azure Machine Learning

Strong understanding of AI/ML concepts and model lifecycle

Experience deploying and consuming models via APIs

Strong programming skills in Python / Java / similar languages

Experience working with data pipelines and data processing

Knowledge of REST API integration and system design

Good to Have

Experience with Azure services (App Service, Functions, AKS, Data Factory)

Familiarity with ML frameworks (Scikit-learn, TensorFlow, PyTorch)

Exposure to MLOps practices (CI/CD for ML models)

Experience with cloud monitoring and logging tools

Understanding of model evaluation and performance tuning

Soft Skills

Strong analytical and problem-solving skills

Good communication and collaboration abilities

Ability to work in Agile teams

Eagerness to learn and adapt to new cloud AI technologies

• Well Established Security Inspection Solutions Company

• Salary: $2500 - $2800 (Basic) + $300 Transport Allowance

• Working Hour: Monday - Friday (8.30am – 5.30pm)

• Company Location: Jurong East (Based on Project Site)

• Variable bonus + Excellent Wellfare

• Training Provided

Job Scope:

• Assist Engineers in the maintenance, repair, and installation of equipment. Diagnose errors and technical issues and determine appropriate solutions.
• Support Engineers in project management, including planning, execution, and monitoring.
• Assist with the installation of new equipment and systems.
• Conduct routine troubleshooting of mechanical and electrical equipment to ensure smooth operations.
• Produce timely and detailed reports regarding maintenance activities, project status, and any issues or delays.
• Follow all company field processes and protocols to ensure safety and efficiency.
• Perform basic housekeeping duties to ensure a clean and safe work environment.
• Perform any other engineering-related tasks as assigned by senior engineers or management.

Requirement:

• Diploma in Electrical / Mechanical Engineering or equivalent
• 0 - 2 years of relevant working experience in similar position

Candidates are encouraged to apply this position via Apply Now button with the following information in the resume:

• Work experiences and job responsibilities
• Current and Expected salary
• Reason for leaving
• Date of availability
• Education background

We regret that only shortlisted candidates will be contacted.

YEOW CHANG FU (R23118759)

EA Recruitment Pte Ltd

EA License No: 21C0492

Key Responsibilities

• Evaluate machinery and equipment specifications to ensure they meet technical requirements; interpret classification rules and respond to review comments.

• Familiar with equipment specifications and installation requirements for main engines, generators, propulsion systems, gearboxes, hydraulic equipment, HVAC, refrigeration, and related systems.

• Knowledgeable in marine piping systems including bilge, ballast, tank gauging, cooling, fuel oil, sanitary, fire protection, and others. Capable of selecting appropriate pump types, compressors, pipe materials, thicknesses, valves, and fittings that meet pressure ratings and functional needs.

• Coordinate with designers and vendors to develop pipe schematic diagrams, machinery space equipment layouts, and equipment installation plans.

• Review mechanical interfaces for major equipment such as main engines, gearboxes, and propeller shafting.

• Collaborate with a team of engineers to develop detailed 3D ship models for production, including interfacing and clash checks on pipe routing, HVAC, electrical installations, and other systems; generate material take-offs (MTO) for pipe routing, fittings, and pipe spools.

Requirements

• Bachelor's degree or Diploma in Marine Engineering.

• Minimum 5 years of relevant experience in a shipyard environment.

• Proficiency in AutoCAD.

• Good overall computer skills.

• Solid understanding of shipbuilding and project processes; ability to comprehend technical specifications and engage in project discussions with clients.

• Strong analytical, communication, and interpersonal skills.

• Willing to travel to Batam or other countries for technical meetings as required.

Our esteemed client in the ICT industry is seeking an Audio Engineer to join their dynamic team:

• Employment Type: Permanent
• Position: Audio Engineer / Audio Specialist
• Location: West
• Working Hours: Monday to Friday, office hours
• Salary Package: Up to $4,000 + Bonus

Job Responsibilities:

• To support the design, setup, and maintenance of audio solutions across various projects.
• To install and configure audio systems.
• To program and fine-tune sound equipment.
• Ensure all audio setups meet required standards and function properly.
• Handle wiring, testing, and commissioning of audio setups.
• Support system design and provide technical assistance.

Job Requirements:

• At least Diploma in Electrical/ Electronic Engineering or a related discipline.
• Minimum 1 year of relevant working experience.
• Hands-on skills in audio setup, troubleshooting, and system integration.

Ready to apply? Here’s how:

• Click the APPLY button, or
• Email your resume (in MS Word or PDF format) to adelin@intuitrecruitment.com. Include the job title in your email subject line for prompt processing.

Only shortlisted candidates will be notified.

By submitting your application, you consent to the collection and use of your personal data under Personal Data Protection Act (PDPA).

Adelin Chong | EA Personnel Reg No.: R1875641

Intuit Recruitment Pte Ltd | EA License No.: 25C2793

An award-winning full service law firm, Allen & Gledhill LLP has been providing legal services to premier clients since 1902. One of the largest law firms in Singapore, Allen & Gledhill counts among its clients some of the most well-known local and multinational companies and financial institutions. We have positions for highly motivated and committed individuals to join our Firm:

AI Engineer

Job Description:

This role will be part of the Information Systems team, focusing on the development and deployment of intelligent applications and Large Language Model (LLM) solutions.

The candidate should possess a passion for creating intelligent applications, proven full-stack development experience, strong communication and organizational skills, be self-motivated and have an eye for details.

This job description will be subject to periodic review and amendment in accordance with the needs of the Firm.

Key responsibilities:

• Design, develop, and deploy intelligent applications and LLM-based solutions.
• Maintain, test, and debug existing code; refactoring code to ensure readability and maintainability.
• Perform full-stack development using Python, React, and TypeScript.
• Deploy and manage applications on both on-premise and cloud platforms, utilizing Kubernetes for orchestration.
• Integrate machine learning models into production environments.
• Ensure security best practices are embedded in the application lifecycle.
• Collaborate with cross-functional teams to define and implement innovative solutions.
• Keep abreast of current and emerging trends in artificial intelligence

Job Requirements:

• Possess at least a Bachelor's Degree/Post Graduate Diploma/Professional Degree in Computer Science/Information Technology/Engineering, or equivalent.
• Minimum of 2 years of working experience in full-stack development and AI/ML engineering roles.
• Proven proficiency in Python, React, and TypeScript.
• Demonstrable experience in deploying LLM-based solutions.
• Strong working knowledge of container orchestration, specifically Kubernetes.
• Demonstrated ability to learn new skills and technologies swiftly.
• Proficiency in critical thinking and problem-solving skills.
• Experience working with security infrastructure and compliance standards in a legal tech context is an added advantage.

Job Scopes:

• Supervise and coordinate site construction activities for PUB projects.
• Ensure works are completed according to specifications, schedule, and safety requirements.
• Liaise with consultants, subcontractors, and authorities on technical matters.
• Prepare project documentation e.g. method statements, reports, and submissions.
• Monitor site progress and resolve technical issues.

Requirements (Qualifications & Experience):

• Degree/Diploma in Civil Engineering, Mechanical Engineering, Construction Management, or related field.
• Experience in PUB/ infrastructure projects preferred.
• Good knowledge of construction processes and site coordination.
• Able to work independently in a fast-paced environment.
• Project is located in the West of Singapore

About the Role

We are looking for a hands-on Mechanical Engineer to design and deliver precision mechanical systems for advanced semiconductor and automation equipment.

In this role, you will be involved in the full engineering lifecycle — from concept and design to system integration and deployment — working on high-performance equipment used in real-world manufacturing environments. You will collaborate with cross-functional teams and play a key role in bringing innovative engineering solutions to life.

What You’ll Work On

• Precision mechanical systems for semiconductor and high-precision automation equipment
• Motion systems, tolerance-critical assemblies, and system-level integrations
• End-to-end product development — from concept design to manufacturing and customer deployment

Key Responsibilities