20 principal software test engineer jobs found

Principal Software Test Engineer 12 months contract Hybrid working Hampshire County £400/day Outside IR35 Seeking an experienced Principal Software Test Engineer to join a long-term programme focused on the development of advanced software solutions on Embedded Linux platforms click apply for full job details

Principal Software Test Engineer 12 months contract Hybrid working Hampshire County £400/day Outside IR35 Seeking an experienced Principal Software Test Engineer to join a long-term programme focused on the development of advanced software solutions on Embedded Linux platforms. This is an excellent opportunity for a senior-level test professional with extensive experience in automated testing, technical leadership, and quality assurance within Agile environments. The role offers a long-term contract engagement with strong potential for extension. Key Responsibilities: - Lead the design, development, and execution of automated test solutions using Python, Squish, and other appropriate technologies. - Provide technical leadership and mentoring to test engineers, promoting testing best practices, coding standards, and continuous improvement. - Drive test estimation, planning, and delivery activities across complex software projects. - Support...

Principal Software Test Engineer 12 months contract | Hybrid working Hampshire County £400/day Outside IR35 Seeking an experienced Principal Software Test Engineer to join a long-term programme focused on the development of advanced software solutions on Embedded Linux platforms. This is an excellent opportunity for a senior-level test professional with extensive experience in automated testing, technical leadership, and quality assurance within Agile environments. The role offers a long-term contract engagement with strong potential for extension. Key Responsibilities: - Lead the design, development, and execution of automated test solutions using Python, Squish, and other appropriate technologies. - Provide technical leadership and mentoring to test engineers, promoting testing best practices, coding standards, and continuous improvement. - Drive test estimation, planning, and delivery activities across complex software projects. - Support...

Internal Title: Senior Full Stack Developer Location: London, UK (Hybrid - typically 1-2 days per month in office) Contract: Permanent, Full-time OR Outside IR35 Contract, 6 months with view to extend Day Rate (contract): £500-550 per day Package (perm): £70,000 - £80,000 + 10% Bonus + 10% Shares + Benefits (see more below) About Appvia Appvia is a specialist cloud, platform, and solutions engineering consultancy, helping organisations modernise software systems, improve developer productivity, and adopt cloud-native practices that enable long-term, sustainable delivery. Our software engineering capability focuses on modern application development, domain-driven design, and improving delivery outcomes through better architecture, testing, and developer experience. We work across complex, high-impact environments in both the public and private sector, delivering solutions where quality, scalability, and reliability are critical. About The Role We're hiring...

PRINCIPAL C++/QT SOFTWARE ENGINEER 12 MONTHS CONTRACT HYBRID WORKING HAMPSHIRE £400/DAY OUTSIDE IR35 Principal C++/Qt Software Engineer is required to work for a leading engineering organisation on a long-term programme developing advanced software solutions for Embedded Linux platforms. They specialise in delivering high-performance solutions for complex, safety-critical environments across sectors such as defence, aerospace, and industrial technology. This is an excellent opportunity to play a key role in the design and delivery of complex software systems while mentoring engineers and shaping technical direction within an Agile/SAFe environment. Key Responsibilities: Lead the design, development and delivery of high-quality software using modern C++ and Qt on Embedded Linux platforms. Provide technical leadership through architecture, code reviews, mentoring and engineering best practices. Collaborate with Product Managers and multidisciplinary teams to...

PRINCIPAL C++/QT SOFTWARE ENGINEER 12 MONTHS CONTRACT | HYBRID WORKING HAMPSHIRE £400/DAY OUTSIDE IR35 Principal C++/Qt Software Engineer is required to work for a leading engineering organisation on a long-term programme developing advanced software solutions for Embedded Linux platforms. They specialise in delivering high-performance solutions for complex, safety-critical environments across sectors such as defence, aerospace, and industrial technology. This is an excellent opportunity to play a key role in the design and delivery of complex software systems while mentoring engineers and shaping technical direction within an Agile/SAFe environment. Key Responsibilities: Lead the design, development and delivery of high-quality software using modern C++ and Qt on Embedded Linux platforms. Provide technical leadership through architecture, code reviews, mentoring and engineering best practices. Collaborate with Product Managers and multidisciplinary teams to...

Job Summary Puma Berry Ltd is seeking an experienced L4 Principal-Level Software Test Engineer with expert-level experience in test design, test execution, and automated test scripting , preferably using Python and Squish , to join a long-term programme developing advanced software on Embedded Linux platforms. This is a 12+ month Outside IR35 contract , with the potential for extension. You'll provide technical leadership while remaining hands-on with test automation, mentoring, and quality delivery within an Agile/SAFe environment. If you have a proven track record of leading test teams, delivering high-quality automated test solutions, and working closely with software engineers and stakeholders, we'd love to hear from you. Duties Lead the design, development and execution of automated test solutions using Python , Squish , and other appropriate test technologies. Provide technical leadership by mentoring test engineers, leading estimation workshops, and driving...

Job Summary Puma Berry Ltd is seeking an experienced L4 Principal-Level Software Test Engineer with expert-level experience in test design, test execution, and automated test scripting , preferably using Python and Squish , to join a long-term programme developing advanced software on Embedded Linux platforms. This is a 12+ month Outside IR35 contract , with the potential for extension. You'll provide technical leadership while remaining hands-on with test automation, mentoring, and quality delivery within an Agile/SAFe environment. If you have a proven track record of leading test teams, delivering high-quality automated test solutions, and working closely with software engineers and stakeholders, we'd love to hear from you. Duties Lead the design, development and execution of automated test solutions using Python , Squish , and other appropriate test technologies. Provide technical leadership by mentoring test engineers, leading estimation workshops, and driving...

Full job description Job Summary Puma Berry Ltd is seeking an experienced  L4 Principal-Level Software Test Engineer  with expert-level experience in  test design, test execution, and automated test scripting , preferably using  Python and Squish , to join a long-term programme developing advanced software on Embedded Linux platforms. This is a  12+ month Outside IR35 contract , with the potential for extension. You'll provide technical leadership while remaining hands-on with test automation, mentoring, and quality delivery within an Agile/SAFe environment. If you have a proven track record of leading test teams, delivering high-quality automated test solutions, and working closely with software engineers and stakeholders, we'd love to hear from you. Duties Lead the design, development and execution of automated test solutions using  Python ,  Squish , and other appropriate test technologies. Provide technical...

Full job description Job Summary Puma Berry Ltd is seeking an experienced  L4 Principal-Level Software Test Engineer  with expert-level experience in  test design, test execution, and automated test scripting , preferably using  Python and Squish , to join a long-term programme developing advanced software on Embedded Linux platforms. This is a  12+ month Outside IR35 contract , with the potential for extension. You'll provide technical leadership while remaining hands-on with test automation, mentoring, and quality delivery within an Agile/SAFe environment. If you have a proven track record of leading test teams, delivering high-quality automated test solutions, and working closely with software engineers and stakeholders, we'd love to hear from you. Duties Lead the design, development and execution of automated test solutions using  Python ,  Squish , and other appropriate test technologies. Provide technical...

Lead SRE / Observability Engineering Lead - (Outside IR35 Contract / Remote) Location: Bristol / London HQ - Largely Remote (Occasional Travel) Day Rate: Outside IR35 - £700 p/d Duration: 3-6 Months Initial - with intention to extend Payment Terms: Monthly Our client is a FTSE100 Wealth/Asset Management firm seeking to engage a Lead SRE Engineer (Observability SME) to support the implementation and instrumentation of their new Observability solution. This role will be critical in delivering against our Digital OKRs by embedding observability best practices, frameworks, and tooling across digital platforms and engineering teams. Key Responsibilities: Strategy & Roadmap: Define and drive the observability roadmap in alignment with business priorities and digital platform objectives. Champion observability-by-design standards across the Software Development Lifecycle (SDLC). Reliability & Performance: Establish and manage SLIs, SLOs, and error...

This role is delivered within secure environments. Candidates must be eligible for UK SC and DV clearance and hold UK Citizenship. Opening: Join the Mission At ByDesign Secure, we believe that world-class security shouldn't be an afterthought—it should be the foundation. We are an independent, outputs-based consultancy dedicated to solving the most complex data assurance challenges in the UK public sector. Currently, we are working on a landmark transformation of a cross-government secure IT system. This is an exciting opportunity to help architect a private cloud environment from the ground up and modernize the end-user services that power national decision-making. We don't believe in ʺbilling by the hourʺ or rigid hierarchies; we are a lean, expert team focused on delivering high-impact technical outcomes. If you are a self-starter who thrives on autonomy and wants to see your engineering or architectural decisions shape the future of sovereign security, we want to talk to...

Lead SRE/Observability Engineering Lead - (Outside IR35 Contract/Remote) Location: Bristol/London HQ - Largely Remote (Occasional Travel) Day Rate: Outside IR35 - £700 p/d Duration: 3-6 months Initial - with intention to extend Payment Terms: Monthly Our client is a FTSE100 Wealth/Asset Management firm seeking to engage a Lead SRE Engineer (Observability SME) to support the implementation and instrumentation of their new Observability solution. This role will be critical in delivering against our Digital OKRs by embedding observability best practices, frameworks, and tooling across digital platforms and engineering teams. Key Responsibilities: Strategy & Roadmap: Define and drive the observability roadmap in alignment with business priorities and digital platform objectives. Champion observability-by-design standards across the Software Development Lifecycle (SDLC). Reliability & Performance: Establish and manage SLIs, SLOs, and error budgets to...

Lead SRE / Observability Engineering Lead - (Outside IR35 Contract / Remote) Location: Bristol / London HQ - Largely Remote (Occasional Travel) Day Rate: Outside IR35 - £700 p/d Duration: 3-6 Months Initial - with intention to extend Payment Terms: Monthly Our client is a FTSE100 Wealth/Asset Management firm seeking to engage a Lead SRE Engineer (Observability SME) to support the implementation and instrumentation of their new Observability solution. This role will be critical in delivering against our Digital OKRs by embedding observability best practices, frameworks, and tooling across digital platforms and engineering teams. Key Responsibilities: Strategy & Roadmap: Define and drive the observability roadmap in alignment with business priorities and digital platform objectives. Champion observability-by-design standards across the Software Development Lifecycle (SDLC). Reliability...

Lead Backend Software Engineer – Data Services Federated Data Services | Distributed Systems | Apache Spark | DataFusion | Python | Kubernetes Location: London (2 days per week onsite) Rate: £700–£800 per day (Outside IR35) Duration: Initial 6-month contract with likely extension Overview We're looking for an experienced Lead Backend Software Engineer to join a high-profile programme building secure, cloud-native data services that will support data-driven research and innovation at national scale. This is a founding engineering role, offering the opportunity to shape the architecture, engineering standards, and core data services from the ground up. Working closely with the Engineering Manager and a small team of senior engineers, you'll establish the technical foundations for a complex federated data platform operating within a highly regulated environment. We're looking for someone who enjoys building from first principles, thrives in ambiguity, and...

Lead Backend Software Engineer – Data Services Federated Data Services | Distributed Systems | Apache Spark | DataFusion | Python | Kubernetes Location: London (2 days per week onsite) Rate: £700–£800 per day (Outside IR35) Duration: Initial 6-month contract with likely extension Overview We're looking for an experienced Lead Backend Software Engineer to join a high-profile programme building secure, cloud-native data services that will support data-driven research and innovation at national scale. This is a founding engineering role, offering the opportunity to shape the architecture, engineering standards, and core data services from the ground up. Working closely with the Engineering Manager and a small team of senior engineers, you'll establish the technical foundations for a complex federated data platform operating within a highly regulated environment. We're looking for someone who enjoys building from first principles, thrives in ambiguity, and can balance strategic...

Job Summary We are seeking an experienced L4 Principal C++/Qt Software Engineer (Outside IR35) with extensive commercial Qt expertise and advanced modern C++ skills to join a long-term programme developing advanced software on Embedded Linux platforms . This is a 12+ month contract (Outside IR35) with a strong likelihood of extension. You will provide technical leadership while remaining hands-on across software development, architecture, and mentoring within an Agile/SAFe environment . If you have a proven track record delivering complex C++/Qt applications, leading engineering teams, and building software for Embedded Linux systems, we would love to hear from you. Key Responsibilities Lead the design, development, and delivery of high-quality software using modern C++ and Qt on Embedded Linux platforms Provide technical leadership through mentoring, contributing to architecture, and driving engineering best practices (code reviews, coding standards, CI/CD)...

Job Summary We are seeking an experienced L4 Principal C++/Qt Software Engineer (Outside IR35) with extensive commercial Qt expertise and advanced modern C++ skills to join a long-term programme developing advanced software on Embedded Linux platforms . This is a 12+ month contract (Outside IR35) with a strong likelihood of extension. You will provide technical leadership while remaining hands-on across software development, architecture, and mentoring within an Agile/SAFe environment . If you have a proven track record delivering complex C++/Qt applications, leading engineering teams, and building software for Embedded Linux systems, we would love to hear from you. Key Responsibilities Lead the design, development, and delivery of high-quality software using modern C++ and Qt on Embedded Linux platforms Provide technical leadership through mentoring, contributing to architecture, and driving engineering best practices (code reviews, coding standards, CI/CD)...

Lead Backend Software Engineer - Data Services Federated Data Services | Distributed Systems | Apache Spark | DataFusion | Python | Kubernetes Location: London (2 days per week onsite) Rate: £700-£800 per day (Outside IR35) Duration: Initial 6-month contract with likely extension Overview We're looking for an experienced Lead Backend Software Engineer to join a high-profile programme building secure, cloud-native data services that will support data-driven research and innovation at national scale. This is a founding engineering role, offering the opportunity to shape the architecture, engineering standards, and core data services from the ground up. Working closely with the Engineering Manager and a small team of senior engineers, you'll establish the technical foundations for a complex federated data platform operating within a highly regulated environment. We're looking for someone who enjoys building from first principles, thrives in ambiguity, and can balance...

Lead Backend Software Engineer - Data Services Federated Data Services | Distributed Systems | Apache Spark | DataFusion | Python | Kubernetes Location: London (2 days per week onsite) Rate: £700 - £800 per day (Outside IR35) Duration: Initial 6-month contract with likely extension Overview We 're looking for an experienced Lead Backend Software Engineer to join a high-profile programme building secure, cloud-native data services that will support data-driven research and innovation at national scale. This is a founding engineering role, offering the opportunity to shape the architecture, engineering standards, and core data services from the ground up. Working closely with the Engineering Manager and a small team of senior engineers, you 'll establish the technical foundations for a complex federated data platform operating within a highly regulated environment. We 're looking for someone who enjoys building from first principles, thrives in...