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Outside IR35 senior software developer

8 senior software developer jobs found

CL
May 27, 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
May 31, 2026  
Civil / Structural Engineer
Civil / Structural Engineer Remote working (occasional visits to project offices) Up to £65 per hour (Umbrella) Overview: We're looking for a Civil & Structural Engineer who's ready to apply their technical expertise to some of the most exciting and meaningful projects in the Energy Transition space. If you want to work on low-carbon, first-of-a-kind and next-generation energy technologies, this is your opportunity to make a real impact. The role: You'll work closely with the Civil & Structural Group Lead to develop cost-effective, efficient and innovative engineering solutions for complex energy projects. Your role will span concept through to detailed design, using tools such as Revit, Tekla, Robot, AutoCAD and Civil 3D to turn ideas into practical, buildable designs. Your responsibilities will include: Developing Civil & Structural solutions across Feasibility, Concept, FEED, Value Engineering and Detailed Design stages. Producing deliverables including...
IR35 Status:
Outside IR35

CV-Library Manchester, Greater Manchester Contractor
CL
May 31, 2026  
DV Cleared DevOps Engineer
Location: Worcester (Site based) Duration: 6 month initial contract Rate: £82ph LTD (Outside IR35) Role details: Our client, a leader in the Defence & Security sector, is currently seeking a DV Cleared Software / DevOps Engineer for an initial 6-month contract, based on-site in Worcester. Key Responsibilities: Collaborating with coworkers to conceptualise, develop, and release software. Conducting quality assurance to ensure that the software meets prescribed guidelines. Rolling out fixes and upgrades to software, as needed. Securing software to prevent security breaches and other vulnerabilities. Collecting and reviewing customer feedback to enhance user experience. Suggesting alterations to workflow in order to improve efficiency and success. Pitching ideas for projects based on gaps in the market and technological advancements. Job Requirements: Active MOD DV Clearance. Strong proficiency with CI/CD tools such as Gitlab CI, Terraform, Ansible, Helm Charts, Python,...
IR35 Status:
Outside IR35

CV-Library Worcestershire, UK Contractor
CL
May 30, 2026  
Electrical Design Engineer
A Contract position Outside IR35 Hybrid working - 3 days on site Our client, a pioneering company in the aerospace sector, is currently seeking an Electrical Design Engineer to join their team on a contract basis. This role supports the design and development of an electromechanical High Voltage (HV) Power Distribution Unit (PDU) for a groundbreaking hydrogen propulsion system, making it a unique opportunity within the aerospace industry. Key Responsibilities: Supporting the design and development of an electromechanical HV PDU for the ZA200-B hydrogen propulsion system. Preparing, maintaining, and reviewing power distribution documentation, records, and reports to support the development of the ZA200 hydrogen propulsion system. Engaging with external partners and suppliers to develop and mature high-voltage power distribution units for the ZA200-A hydrogen propulsion system. Planning and building test plans to support power distribution commissioning activities. Providing...
IR35 Status:
Outside IR35

CV-Library Gloucestershire, 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 29, 2026  
Senior Designer
An established engineering and infrastructure delivery organisation is seeking an experienced Senior EC&I Designer to support the delivery of complex industrial and energy-sector projects across the UK. This is a contract role and can be outside ir35. Suited to a motivated designer with strong experience in Electrical, Control & Instrumentation (EC&I) design, capable of producing high-quality technical deliverables while supporting junior team members and collaborating across multidisciplinary engineering teams. Key Responsibilities Produce safe, practical and cost-effective EC&I design solutions in line with project and company procedures Develop design deliverables including: Loop diagrams Block cable diagrams Schematic diagrams 3D models Prepare associated documentation such as: Bills of materials Cable schedules Design packs Material requisitions Support proposal and project activities as assigned by the Lead or Chief Engineer Mentor and support less...
IR35 Status:
Outside IR35

CV-Library Manchester, UK Contractor
CL
May 27, 2026  
Senior Aerothermal Engineer
A Contract position - Outside IR35 Hybrid working - 3 days pw on site Our client, a leading company in the aerospace sector, is currently seeking a Senior Aerothermal Engineer to lead the aerothermal design and development of air delivery systems for hydrogen fuel cell powertrains. This role is ideal for an experienced aerospace engineer with deep expertise in air system architecture, turbomachinery, and thermo-fluid analysis, who can take full technical ownership from concept generation through certification-ready design, testing, and supplier integration. Acting as a subject matter expert, the successful candidate will work across multidisciplinary teams and the supply chain to develop, analyse, and validate fuel cell cathode and air delivery systems using first-principles analysis, simulation, and empirical testing, supporting the certification and deployment of current and future zero-emission propulsion systems. Candidates must have proven Aerospace experience - air supply...
IR35 Status:
Outside IR35

CV-Library Gloucestershire, UK Contractor
CL
May 27, 2026  
Engineering Manager
Location Hybrid working from our clients office near Old Trafford, Manchester Our Client An engineering design consultancy working closely with a wide range of clients, across a number of disciplines within the UK Water, rail, and utilities industries. Wellbeing is one of our company’s core values – we have developed a safe, just and fair workplace, putting the mental and physical wellbeing of our team first. We offer an excellent package for permanent staff, including an employee benefits scheme, workplace pension scheme, and training and development opportunities. For contractors, we offer a stable position outside IR35 in a positive and well-motivated team. Role Profile: * Direct and develop engineers, CAD technicians and graduates. * Identify and implement appropriate, safe, efficient and value-engineered design solutions and communicate these to client and project teams * Act as Professional Head for design function * Guide design in compliance with relevant...
IR35 Status:
Outside IR35

CV-Library Manchester, Greater Manchester Contractor
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