Freelancer UK
  • All Jobs
  • Outside IR35
  • Agencies
  • Post a Job
  • Pricing
  • Guides
  • Sign in
  • Sign up
  • All Jobs
  • Outside IR35
  • Agencies
  • Post a Job
  • Pricing
  • Guides

Email me jobs like this

Email me jobs like this
Refine Search
Refine by Categories
Engineering 19 Construction 5 Information Technology 4 Other 1
Outside IR35 Contractor senior systems engineer

28 senior systems engineer jobs found

CL
Jun 06, 2026  
Senior Electrical Engineer - CONTRACT Outside IR35
Senior Electrical Design Engineer / Senior Electrical Engineer - CONTRACT Outside IR35 Surrey, UK Shape the Future of Clean Energy ARCA Resourcing is partnering with a pioneering clean energy technology company developing next-generation integrated power solutions. As part of a rapidly growing engineering team, we have a requirement for a Senior Electrical Design contractor to work on highly advanced electrical systems that are driving the future of sustainable power. We’re looking for a talented Senior Electrical Engineer / Senior Electrical Design Engineer with strong industrial electrical design expertise and a passion for solving complex engineering challenges. The Role You’ll conduct electrical engineering activities across innovative, high-impact projects — taking concepts from feasibility and architecture through to integration, testing, commissioning, and operational support. Working within a multidisciplinary environment, you’ll collaborate with engineers and scientists to...
IR35 Status:
Outside IR35

CV-Library GU2, Artington, Surrey Contractor
CL
Jun 06, 2026  
Senior Software Developer
Senior Software Engineer (Contract) 3-Month Engagement | Outside IR35 | Up to £475 per day | Hybrid (London / Ipswich) A rapidly expanding SaaS company is seeking an experienced Senior Software Engineer to support their agile delivery team on an initial 3-month contract. This position offers a strong mix of hands-on development and strategic input, with the opportunity to shape system architecture, influence engineering practices, and contribute directly to product evolution. You'll play a key role in designing, building, and improving scalable cloud-native applications, while also guiding team members and promoting high standards across the development lifecycle. Core expertise required: Advanced experience with C# and .NET (Framework and Core) Frontend development using TypeScript, HTML, CSS, and either React or Vue Proven track record with AWS, ideally including serverless architectures (e.g., Lambda) Experience with CI/CD pipelines and Infrastructure as Code (Terraform or...
IR35 Status:
Outside IR35

CV-Library Ipswich, Suffolk Contractor
CL
Jun 05, 2026  
Commissioning Manager
Commissioning Manager  I am currently looking for an experienced Commissioning Manager to support the installation and commissioning of a major grid stability infrastructure project in South Wales. You will be responsible for overseeing commissioning activities associated with control, instrumentation, and electrical systems, ensuring all works are completed safely, efficiently, and in accordance with project specifications and programme requirements. The role will play a key part in delivering a smooth handover into operations. Requirements Proven experience in a Commissioning Manager or Senior Commissioning Engineer role Strong background in energy projects such as power generation, substations, grid infrastructure, or heavy industrial projects An electrical background is preferred This is initially a 3-month contract with potential for extension, offering competitive day rates on an Outside IR35 basis
IR35 Status:
Outside IR35

CV-Library Pembroke SA71, UK Contractor
CL
Jun 05, 2026  
Senior Project Engineer
Job Title: Project Engineer / Senior Project Engineer (MEP - Building Services) Location: Birmingham area (min. 3 days office-based) Duration: to 31/03/2027 Role Overview We are seeking a Project Engineer and Senior Project Engineer with strong MEP / Building Services experience to support a major infrastructure programme on a client-side Integrated Project Team. The role focuses on assurance and oversight of contractor-led design and delivery, not hands-on design work. You will support the integration and verification of building services across tunnel portal buildings, shafts, and pumping stations. Key Responsibilities Oversee contractor MEP design assurance and integration Review self-assurance, testing, commissioning, and certification Ensure coordination of HVAC, electrical, mechanical, lighting, and fire systems Support delivery of multi-discipline infrastructure assets Requirements Strong MEP / building services background Experience in assurance, client-side, or...
IR35 Status:
Outside IR35

CV-Library Birmingham, West Midlands Contractor
CL
Jun 05, 2026  
Senior Civil Design Engineer
Senior Civil Design Engineer - Water Location: Old Trafford Manchester Work Type: Outside IR35 Contract Our client, a leading Design House, are seeking an experienced Senior Civil Design Engineer to join their team. In this role, you will develop high-quality, safe, and efficient engineering designs across a range of infrastructure and non-infrastructure projects within the regulated water sector, covering both clean water and wastewater systems. You will also support project delivery, mentor junior team members, and ensure all work complies with relevant safety, quality, and industry standards. Key Responsibilities * Provide design deliverables that satisfy safety and quality requirements. * Identify efficient design solutions from scopes and site visits and communicate these to client and project team * Direct and develop CAD technicians and more junior designers and graduates. * Prepare design risk assessments, reports and specifications. * Design in compliance with...
IR35 Status:
Outside IR35

CV-Library Greater Manchester, UK Contractor
CL
Jun 04, 2026  
Contract Senior Electrical Design Engineer
Contract Senior Electrical Design Engineer Outside IR35 London  An excellent opportunity has arisen for an experienced Electrical Design Engineer to join a well-established building services consultancy in London on a contract basis, operating outside IR35. This hybrid position involves working within a multidisciplinary building services engineering team, contributing to the delivery of electrical design solutions across a diverse portfolio of projects. The successful candidate will play a key role in developing electrical building services designs, producing technical documentation, and supporting coordinated BIM models. Based in the London office with flexible hybrid working, this role offers the opportunity to be involved in high-quality projects alongside a team of experienced engineers and consultants. Key Responsibilities As an Electrical Design Engineer, your duties will include: Delivering electrical building services designs across a range of projects Producing...
IR35 Status:
Outside IR35

CV-Library London, UK Contractor
CL
May 29, 2026  
Mechanical Engineer
Job Title: Intermediate/Senior Mechanical Engineer - 12 Month Contract or Permanent Location: Mostly remote (occasional travel to London) Contract Rate: £45-£53 per hour outside IR35 or Permanent Salary: £50-£60k About the Role: We are seeking an experienced Mechanical Engineer to join a dynamic team focused on innovative engineering solutions in the water and environmental sector. This role offers the flexibility of primarily remote work, with occasional visits to the London office, and provides the opportunity to work on cutting-edge projects in a collaborative environment. Key Responsibilities: Design, develop, and optimise mechanical systems and components. Prepare detailed engineering drawings, specifications, and documentation. Work closely with project teams to deliver solutions from concept through to installation and commissioning. Support project planning, risk assessment, and troubleshooting mechanical issues. Ensure compliance with relevant industry standards,...
IR35 Status:
Outside IR35

CV-Library London, UK Contractor
CL
May 16, 2026  
Senior Electrical Design Engineer
An excellent opportunity has arisen for an experienced Electrical Design Engineer to join a well-established building services consultancy in London on an contract basis outside IR35. This hybrid role will involve working as part of a multidisciplinary building services engineering team, supporting the delivery of electrical design solutions across a range of building projects. The successful Electrical Design Engineer will contribute to the development of electrical building services designs, technical documentation and coordinated BIM models. This role is based in the London office with hybrid working available, offering the chance to work on high-quality building services projects alongside experienced engineers and consultants. Key Responsibilities · As an Electrical Design Engineer, your responsibilities will include: · Producing electrical building services designs for a variety of building projects · Developing electrical schematics, layouts and...
IR35 Status:
Outside IR35

CV-Library London, UK Contractor
CL
Apr 16, 2026  
Senior Electrical Design Engineer
An excellent opportunity has arisen for an experienced Electrical Design Engineer to join a well-established building services consultancy in London on an contract basis outside IR35. This hybrid role will involve working as part of a multidisciplinary building services engineering team, supporting the delivery of electrical design solutions across a range of building projects. The successful Electrical Design Engineer will contribute to the development of electrical building services designs, technical documentation and coordinated BIM models. This role is based in the London office with hybrid working available, offering the chance to work on high-quality building services projects alongside experienced engineers and consultants. Key Responsibilities · As an Electrical Design Engineer, your responsibilities will include: · Producing electrical building services designs for a variety of building projects · Developing electrical schematics, layouts and...
IR35 Status:
Outside IR35

CV-Library London, UK Contractor
CL
Jan 21, 2026  
Senior HVAC Design Engineer
We are working with this leading multi national data centre and mission critical specialist who are working on schemes across UK and europe. With data centres being crucial components of today's infrastructure, supporting everything from business to public services. Operators must ensure the longevity, efficiency, and sustainability of their sites while optimizing them for mission-critical tasks. The teams are at the forefront of designing innovative and energy-efficient data centres, ensuring that our clients meet their goals of performance, cost-efficiency, and sustainability. The Opportunity Join our international and multidisciplinary team of passionate design engineers and help us create high-quality, sustainable, and innovative data centre structures. You will work on medium to large-scale mission-critical projects, covering all stages of design - from concept to construction supervision and handover. As part of an interdisciplinary team of architects, advisors &...
IR35 Status:
Outside IR35

CV-Library London, UK Contractor
CL
Jun 05, 2026  
Requirements Engineer
Requirements Engineer Location: Berkshire (Hybrid) Type: Contract (Outside IR35) Security Clearance: SC clearance required About the Opportunity We are working with a well-established engineering and project delivery organisation operating within the UK nuclear sector. They support major programmes across the full project lifecycle, delivering engineering, design, consultancy, refurbishment, installation, and decommissioning services within highly regulated and high-hazard environments. With a strong reputation for technical expertise and collaborative project delivery, they work across some of the UK’s most complex nuclear sites and infrastructure programmes. This position would suit a Mechanical Engineer or EC&I Engineer who has practical experience undertaking requirements capture and requirements management activities within complex engineering environments. This is not a traditional Systems Engineering or “stereotypical” Requirements Engineering role. The successful...
IR35 Status:
Outside IR35

CV-Library Berkshire, UK Contractor
CL
Jun 05, 2026  
Security Systems Engineer - Reading / London Area
Security Systems Engineer Reading / London Area + Nationwide Travel Rate: From £260 per day + Overtime 6 Month Rolling Contract Weekly Pay Door-to-Door Pay Outside IR35 – Ltd Company or Self-Employed/Sole Trader Payments Available V7 are looking for experienced Installation Project / Service Engineers on behalf of a leading electronic security systems specialist operating across the commercial sector. This is an excellent opportunity for an experienced engineer looking for long-term contract work with competitive rates and consistent projects. The role will involve the installation, commissioning, servicing and maintenance of integrated electronic security systems across commercial sites throughout the west london and M4 corridor area. Key Responsibilities Installation and commissioning of CCTV, Access Control, Intruder Alarm, AV and integrated security systems Service and maintenance works across commercial sites Working with networked systems including routers, switches and...
IR35 Status:
Outside IR35

CV-Library Slough, UK Contractor
CL
Jun 05, 2026  
Fire & Security Systems Engineer - Midlands
Fire & Security Systems Engineer East Midland Rate: From £260 per day + Overtime Contract: 6 Month Rolling Contract Weekly Pay | Door-to-Door Pay | Outside IR35 V7 are looking for experienced Fire & Security Systems Engineers on behalf of a leading specialist within the electronic security and life safety sector. This is an excellent opportunity for experienced contractors looking for long-term contract work across the East Midlands and wider Midlands region. The role will involve the installation, service and maintenance of integrated fire and security systems across commercial sites. Engineers must be comfortable working independently while maintaining high standards of workmanship and client communication. Key Responsibilities Installation and servicing of CCTV, Access Control, Intruder and Fire Alarm systems Fault finding and maintenance on commercial sites Small works and reactive call-outs Working with TCP/IP and networked systems Liaising with clients and site...
IR35 Status:
Outside IR35

CV-Library Nottinghamshire, UK Contractor
CL
Jun 05, 2026  
Lead Java Tech Role- 3 month Contract
I'm looking for a Lead Backend Software Engineer to shape backend architecture, drive engineering excellence, and guide teams building high‑performance digital products used at scale. This is a hands‑on leadership role where you’ll influence technical strategy, mentor engineers, and ensure backend systems are robust, secure, and future‑ready. What you’ll be doing Lead backend architecture – Define and evolve scalable, secure, high‑performance backend systems Set engineering standards – Champion best practices, secure coding (OWASP), and high‑quality delivery Hands‑on technical contribution – Support critical backend work and review complex code Guide teams & mentor engineers – Facilitate design discussions, code reviews, and technical decision‑making Improve tooling & CI/CD – Enhance pipelines, build processes, and operational workflows Drive continuous improvement – Reduce technical debt and introduce modern backend approaches Support compliance – Ensure systems align...
IR35 Status:
Outside IR35

CV-Library London, UK Contractor
CL
Jun 05, 2026  
Project Engineer
Project Engineer Opportunity (COMAH SITE) - Contract Role in Loughborough About the Role We are seeking an experienced Project Engineer to join our client's team on a key project based in Loughborough. This opportunity will involve working on a challenging and complex programme involving cooling towers, including removal, installation, and decommissioning activities. This contract role extends until 2027 and offers a day rate of £425 (outside IR35, no expenses). Work is required on site 5 days a week. Key Skills and Experience COMAH Site Experience: Proven ability to operate in high-hazard environments adhering to stringent safety and compliance regulations. Cooling Towers and Legionella Training: Hands-on knowledge in the removal, installation, and management of cooling towers, with an understanding of legionella control procedures. Mechanical Expertise: Competence in mechanical systems applied to the programme specifics. Safety and Compliance: Familiarity with CDM...
IR35 Status:
Outside IR35

CV-Library Loughborough, Leicestershire Contractor
CL
Jun 05, 2026  
Electrical Design Engineer
Contract Electrical Design Engineer Cambridge Up to £55/hr Outside IR35 We are working with an innovative engineering business developing advanced industrial systems used in high-performance manufacturing environments. Their technology helps customers reduce energy consumption, improve process reliability and introduce cutting-edge production methods across sectors including food & beverage and advanced composites. Due to continued growth and new product development, they are looking for a contract Electrical Design Engineer to support the team developing next-generation products. The Role: Electrical Design Engineer * This is a broad and hands-on engineering role combining electrical design, problem-solving, system development and customer interaction. * You’ll be involved throughout the full project lifecycle from concept and panel design through to build support, fault finding, commissioning and ongoing product improvement. Key responsibilities include:...
IR35 Status:
Outside IR35

CV-Library Cambridge, Cambridgeshire Contractor
CL
Jun 05, 2026  
Electrical Design Engineer
Location: Crawley Contract Length: 9-12 months (Likely to be a rolling contract) IR35 Status: Outside IR35 Start Date: ASAP   Our market leading client is seeking an experienced Electrical Design Engineer to join their organisation within the power and utilities sector on a long-term contract basis. This role will focus on producing designs up to 132kV across the DNO network, with a strong emphasis on primary substations and protection & control systems. This is a hybrid contract role (3 days in office, 2 from home). This position falls OUTSIDE IR35. A standard D&A medical and site pass is required.   The Role   As an Electrical Design Engineer, you will be responsible for delivering high-quality electrical designs for HV infrastructure projects, supporting network upgrades and new connections across the DNO environment. This is an excellent opportunity for someone with strong 132kV design experience who is looking to work on technically challenging projects...
IR35 Status:
Outside IR35

CV-Library Crawley, UK Contractor
CL
Jun 04, 2026  
FPGA & DSP Engineer
A Contract position Outside IR35 2 days pw on site in Cambridgeshire Our client is seeking an experienced FPGA & DSP Engineer for a contract role. This exciting opportunity involves working on cutting-edge medical and sensing applications. The successful candidate will possess robust skills in HDL and the AMD Vivado toolchain, with solid experience in digital signal processing. Key Responsibilities: Deliver high-quality FPGA/DSP designs and implementations with minimal supervision Contribute to technical discussions, design reviews, and project planning Engage with clients on a technical level, including pre-contract scoping discussions Potentially lead and mentor junior colleagues Work effectively within multidisciplinary project teams Identify and raise technical risks or concerns in a timely manner Communicate progress clearly and maintain appropriate technical documentationCandidate will need to be up-to-speed in some of the areas below: - JESD204C implementation...
IR35 Status:
Outside IR35

CV-Library Cambridgeshire, UK Contractor
CL
May 31, 2026  
Manufacturing Engineer
We are supporting a leading engineering and manufacturing business that delivers specialist solutions across the aerospace, power generation, rail, and oil & gas sectors. Due to continued growth, they are looking for an experienced Manufacturing Engineer to join the team on an initial 8-month contract basis. This is an excellent opportunity to work within a highly technical electro-mechanical manufacturing environment, supporting both existing production and new product introduction activities while driving Lean and Continuous Improvement initiatives across the business. The Role Working closely with Operations, Supply Chain, and Design Engineering, you will provide hands-on manufacturing engineering support across production cells, helping improve process efficiency, reduce waste, and support the introduction of new products and manufacturing methods. Key Responsibilities Support production and manufacturing cells with day-to-day engineering activities Drive Lean...
IR35 Status:
Outside IR35

CV-Library Ashford, Surrey Contractor
CL
May 31, 2026  
Principle Electrical Engineer
Principle Electrical Engineer - Low Carbon Remote (Remote with occasional visits to the office for project meetings) Up to £65 per hour (Umbrella) Overview: You'll be part of a multidisciplinary team delivering cost-effective, efficient and innovative engineering solutions to complex challenges, helping to shape practical, high-quality designs across a wide range of energy projects. This role involves contributing to projects at all stages of maturity, including Feasibility Studies, Concept Design, FEED, Value Engineering and Detailed Design. You'll take a lead role in developing electrical engineering deliverables and supporting the assessment, optimisation and safe operation of electrical systems across the energy sector. Key Responsibilities: Lead and support the development of practical, cost-effective and innovative engineering solutions in collaboration with wider project teams. Deliver engineering work across multiple project phases, from early-stage feasibility...
IR35 Status:
Outside IR35

CV-Library Manchester, Greater Manchester Contractor
  • Follow us on:
  • Facebook
  • Twitter
  • Instagram
  • LinkedIn
  • Home
  • Contact
  • About Us
  • Terms & Conditions
  • Employer
  • Post a Job
  • Search Resumes
  • Sign in
  • Job Seeker
  • Find Jobs
  • Outside IR35
  • Create Resume
  • Sign in
© 2008-2026 Powered by SmartJobBoard Job Board Software