Lead Principal Software Engineer | London-Hybrid

Location: London Start date: Immediate The Role: Join AlphaSights as a Senior Test Engineer within our dynamic Software Engineering Team. In our digital-first organization, ensuring continuous uptime, exceptional product quality, and outstanding user experiences is paramount. This role presents a unique opportunity to make an immediate impact on our engineering efforts. You will collaborate closely with Software Engineering and Product Management, spearheading the design and execution of automated testing solutions that scale across our platform, guaranteeing reliability and quality across frontend, backend, and APIs. We seek a proactive, innovative, and collaborative individual who is committed to continuous improvement and team success. This hands-on leadership role involves not just developing and maintaining automated tests but also guiding Test Engineering strategies, establishing technical standards, mentoring QA team members transitioning to Test Engineering, and defining best practices for testing, quality, and reliability. In this fast-paced environment, you will maintain a positive, solution-oriented mindset while delivering flawless user experiences through robust test automation. In addition to working with teams based in London and Portugal, you will have the chance to engage with teams across EMEA, the US, and Asia. What You’ll Do: Lead the design and development of automated test plans, suites, and frameworks across multiple projects to ensure comprehensive test coverage and high-quality releases. Mentor and guide junior QA engineers, enhancing their automation skills and cultivating a culture of quality and best practices. Maintain and scale test automation infrastructure to support CI/CD pipelines, cross-platform validation, and rapid feedback loops. Perform targeted manual testing, including exploratory testing, edge-case validation, and UI/UX verification when necessary. Collaborate closely with Engineering and Product teams to define test strategies, acceptance criteria, and testing priorities for complex features. Drive cross-team initiatives that enhance overall testing practices.

Resillion seeks a Test Analyst to contribute to projects involving the Aladdin Accounting platform. This hybrid role is based in London and centers on ensuring financial software meets high standards for quality and reliability. Key responsibilities Collaborate with cross-functional teams to develop and improve test plans Carry out test cases for the Aladdin Accounting platform Identify, document, and assist in resolving software issues Work location This position combines on-site and remote work in London.

Location: London Start date: Immediate The Role: Join AlphaSights as a dynamic and motivated Mid-Level Test Engineer within our Software Engineering Team. As a digital business, we prioritize continuous uptime, product quality, and exceptional user experience. This role is a crucial opportunity to make an immediate impact on our product development. Collaborating closely with Software Engineering and Product Management, your focus will be on designing and implementing automated testing solutions that ensure our applications are reliable, scalable, and adhere to the highest standards across frontend, backend, and APIs. In this position, you will be entrusted with specific areas of responsibility and expected to manage your time effectively. A positive, problem-solving mindset is essential, as is a passion for delivering seamless user experiences through robust test automation in a fast-paced environment. We seek a proactive and creative individual who enjoys collaboration and is dedicated to both personal growth and team success. You will have opportunities for on-the-job and classroom-based learning, diving into the field of IT with exposure to various technologies, regions, and challenges. Working primarily with teams in London and Portugal, you will also engage with colleagues from other offices across EMEA, the US, and Asia. What You’ll Do: Design and develop automated test plans and suites for various projects, validating software functionality and ensuring comprehensive regression coverage. Develop and maintain automated testing frameworks and infrastructure, providing tools for developers to test their own code. Lead test automation initiatives and conduct targeted manual testing as needed, such as exploratory testing, UI validation, and edge case verification. Create, manage, and maintain test data to support automated testing across environments, ensuring consistency and reproducibility of results. Support robust testing through API test automation, test data management, and cross-platform validation across browsers and devices. Collaborate with cross-functional teams to enhance product quality and user experience.

Role Overview 8th Light, Inc. is seeking a Senior Software Engineer to join its London-based team. This hybrid role offers the chance to work alongside experienced engineers on a variety of client projects. The company is a well-established software consultancy, known for its focus on quality and collaboration. What You Will Do Design, develop, and maintain software applications for a range of clients and industries Work closely with other engineers to deliver reliable, well-crafted solutions Mentor junior engineers, sharing knowledge and supporting their professional growth Contribute to a team culture that values learning and continuous improvement Location This position is based in London, England, with a hybrid work arrangement.

Join CUR8 as a Back-end EngineerAt CUR8, we are on a transformative mission to reshape the carbon removal landscape. With the pressing need to eliminate 5-10 Gigatonnes of CO₂ by 2050, our innovative platform empowers organizations worldwide to meet their carbon neutrality goals.As part of our dedicated Risk Engine squad, you will play a pivotal role in evaluating and refining high-quality carbon removal projects, ensuring our clients have access to reliable insights and data.Your collaboration with our Lead Software Engineer, Senior AI Engineer, and scientists will be vital in converting scientific criteria into robust, scalable software solutions.Key ResponsibilitiesDevelop Application Logic: Craft the code that manages data flow, from document ingestion to model result handling.Translate Science into Code: Work closely with Carbon Scientists to understand project criteria and develop corresponding code logic.Manage Unstructured Data: Create systems that can transform complex real-world inputs into structured, actionable data.Deliver Insights: Design APIs and data structures that present findings to customers in an intuitive user interface.Our Technology StackCore Back-end: GoData Stack: PythonDatabase: PostgreSQLInfrastructure: Google Cloud Platform, TerraformAI Tools: Claude, Gemini, GPTWhile expertise in both Go and Python is not essential, a willingness to engage with both is necessary.Your Technical ExpertiseExperience: A minimum of 2 years in building and maintaining backend software.Language Proficiency: Comfortable with a statically typed language (preferably Go).

About Fuse Energy Fuse Energy is a startup focused on renewable energy, working to deliver a terawatt of clean power. The company develops solar, wind, and hydrogen projects, operates real-time power trading, and builds distributed energy systems. Fuse Energy sells directly to consumers, removing intermediaries to lower costs and pass savings along. Backed by $170M from investors including Multicoin, Balderton, Lakestar, Accel, Creandum, Lowercarbon, Ribbit, and strategic angels such as Nico Rosberg and the co-founder of Solana, Fuse Energy is positioned for rapid growth. The team is also building the Energy Network, a decentralized platform of smart devices that rewards users for electrifying their homes, shifting usage to off-peak times, and helping stabilize the grid. This work supports AI data centers and other energy-intensive sectors. Role Overview: Test Engineer The Test Engineer plays a key role in making sure Fuse’s hardware products and energy systems meet regulatory, safety, and performance standards at every stage. This is a hands-on position, working with both prototypes and deployed systems. The role involves close collaboration with hardware, firmware, software, and operations teams to translate regulatory requirements into practical, testable engineering outcomes. Main Responsibilities Validate designs through structured testing and analysis Support certification processes and ensure compliance with relevant standards Carry out end-of-line verification for hardware and energy systems Work across a range of regulatory areas, including electrical safety, EMC, grid connection, and environmental compliance Collaborate with multidisciplinary teams to ensure products meet all requirements throughout their lifecycle Location London, England, United Kingdom

Are you passionate about cloud technology and seeking to leverage your skills in a dynamic environment? As a Hybrid Cloud Engineer at Syscogb, you'll play a crucial role in designing, implementing, and maintaining hybrid cloud solutions that enable our clients to achieve operational excellence. Collaborate with cross-functional teams to integrate new cloud technologies and optimize existing infrastructures.

Are you a talented Software Engineer in Test, Test Engineer, or Test Analyst who excels in manual testing while embracing the challenges of automation testing? Join our agile team at Version 1, where you'll play a vital role in assisting clients with their business transformation initiatives. Your expertise will be instrumental in identifying requirements, crafting innovative solutions, and offering continuous guidance and support in testing.In this role, you will:Define and execute comprehensive test strategies and scriptsAccurately record and monitor issues for effective resolutionSupport scrum teams in automating tests to streamline development processesReview test environments and processes to drive continuous improvement and uphold quality standardsProvide precise test estimates to aid project planning

Role Overview Position: Senior Software Developer in Test Location: London, UK (Hybrid: roughly one day per week in the office) Contract Type: Permanent, full-time Compensation: £70,000 - £80,000 base salary, plus 10% bonus, 10% shares, and additional benefits About Appvia Appvia delivers cloud solutions and platform engineering to help organizations modernize software systems, boost developer productivity, and adopt cloud-native practices. The team focuses on modern application development, domain-driven design, and improving delivery outcomes through strong architecture, testing, and developer experience. Appvia works with clients in complex, high-impact settings where quality, reliability, and scalability matter. The goal: help organizations ship better software, faster. What You Will Do This is a hands-on, client-facing role within the Solutions Engineering team. The main focus is to advance a large-scale modernization and AI-driven transformation initiative. The Senior Software Developer in Test (React/Java) will: Lead the shift from slow, fragile end-to-end testing to scalable integration, functional, and contract testing methods Guide teams in adopting modern testing and quality engineering practices for complex systems Introduce new tools and approaches to improve developer feedback loops and embed quality early in the software delivery lifecycle Work with greenfield initiatives within brownfield environments Report to a Principal Software Engineer and act as a senior quality engineering advocate within delivery teams Interview Process Discovery conversation with Talent Acquisition Technical interview with the Engineering Team Final interview with Leadership Security Clearance Requirements Eligibility for UK Government Security Clearance (SC) is essential. Candidates must meet the following criteria: Hold a British Passport or Indefinite Leave to Remain (ILR) Have lived in the UK for the past five years No criminal record or financial irregularities

Join Zaizi as a Test Engineer, where your enthusiasm for technology and detail-oriented problem-solving will be highly valued. This position involves direct interaction with clients, making strong communication skills a must. You will gain hands-on experience while contributing to client projects, and we are committed to helping you develop your professional skills.At Zaizi, our work culture is inclusive, modern, and collaborative. We seek bright, positive thinkers with a proactive attitude who are eager to excel in their roles. If this resonates with you, you will thrive in our environment!This role is primarily remote, with occasional on-site client work and travel to our London headquarters for workshops and meetings.

Join our dynamic team at System Canada Technologies as a Test Analyst or Senior Test Analyst. This is an exciting opportunity for individuals who are passionate about quality assurance and eager to contribute to innovative projects in a collaborative environment.

Join Version 1 as a Senior Performance Testing Engineer where you will leverage your expertise in performance testing to ensure the robustness and efficiency of our digital solutions. We are seeking a skilled professional who can design and implement performance tests, analyze results, and provide actionable insights to enhance system performance.Your role will involve collaborating with cross-functional teams to identify performance issues and recommend enhancements. You will utilize various performance testing tools and frameworks, ensuring that our applications meet the highest standards of quality and performance.

ClearBank provides banking infrastructure that supports a wide range of clients, including fintech firms, crypto platforms, traditional banks, and credit unions. Through ClearBank’s API, organizations can strengthen and modernize their banking systems. The company emphasizes a team-first culture shaped by collaboration, fairness, and autonomy. Team members have opportunities to contribute meaningfully and influence how things are done. Role overview This Platform Engineer position sits within Team Serval, part of ClearBank’s Infrastructure Cluster. Reporting to an Engineering Manager, the role centers on designing, implementing, and maintaining the network infrastructure that underpins ClearBank’s services as the business continues to grow. Daily responsibilities include: Designing and maintaining network infrastructure Applying Infrastructure as Code practices to improve deployment processes Supporting software delivery using Azure DevOps Collaborating closely with Technical Product Owners and Engineering Managers to enhance the platform ClearBank has been recognized among the UK’s fastest-growing tech companies by Deloitte Fast 50. Requirements Experience working with Infrastructure as Code Solid networking expertise Practical skills in Azure DevOps A proactive, collaborative approach to solving problems Location This role is based in ClearBank’s London office and follows a hybrid work pattern.

Job Title: Senior Pre-Sales EngineerLocation: London/Bristol - HybridSalary: £56,000 - £70,000Team: CommercialReporting To: Head of Client SolutionsApplication Closing Date: Monday 6th April 2026This role is available in either London or Bristol and requires existing legal authorization to work in the UK. Currently, we are unable to provide visa sponsorship for this position. We prioritize building a diverse global team and evaluate our sponsorship policy on a case-by-case basis. We encourage you to check our careers page for future opportunities that may offer visa sponsorship.Kaluza is transforming the energy landscape with our Energy Intelligence Platform, simplifying the complexities of energy management. We empower energy companies to tackle contemporary challenges while facilitating the transition to a cleaner, electrified future. By harnessing the power of data, artificial intelligence, and real-time decision-making, we create growth opportunities for our partners.Our innovative approach combines predictive algorithms with user-centric design, making clean energy both reliable and affordable. With teams operating across Europe, North America, Asia, and Australia, as well as a joint venture with Mitsubishi Corporation in Japan, we collaborate with industry leaders such as OVO, AGL, and ENGIE, alongside pioneers like Volvo and Volkswagen.Key Responsibilities:AI-Driven Prototyping: Utilize Large Language Models (LLMs) such as Claude and Gemini to swiftly develop and enhance proof-of-concept applications and mock services. Your ability to leverage AI will enable you to operate at a pace that exceeds traditional development cycles, allowing for rapid iteration and innovation.

Join Capco as a Senior Software Development Engineer in Test (SDET) and play a pivotal role in revolutionizing the financial services landscape through cutting-edge automation. Based in London with a hybrid work model, you'll collaborate with a talented engineering team to tackle complex challenges, while enhancing your skills across innovative cloud-native technologies. Be part of high-impact projects that shape the future of finance and energy sectors.

Senior Software Development Engineer in Test (SDET) — Enablement PlatformAbout SwapAt Swap, we are revolutionizing the landscape of modern agentic commerce. Our innovative AI-native platform seamlessly connects backend operations with a cutting-edge storefront experience, designed for brands aspiring to sell anything, anywhere.Our comprehensive offerings include cross-border solutions, tax management, returns processing, demand planning, and our next-gen agentic storefront, empowering merchants with full operational transparency and the ability to make informed, margin-preserving decisions in real-time.We are dedicated to fostering a culture that emphasizes clarity, creativity, and collective ownership as we reshape the future of global commerce.Role OverviewWe are seeking a talented Senior SDET to become an integral part of our Enablement Group. This team is responsible for establishing the foundational elements that empower various teams, including internal development tools, core services, reusable UI components, CI/CD processes, security integrations, public APIs, and our Apollo ingestion and event management system.In this role, you will set and uphold quality standards for our internal systems, ensuring adherence and compliance across teams. You will define both functional and non-functional quality benchmarks, translate these into actionable standards, and validate that our internal services consistently meet these criteria through reviews, gates, and operational signals.Key ResponsibilitiesLead the establishment of quality standards for internal systems encompassing reliability, performance, scalability, security, availability, observability, data integrity, and operational functionality.Collaborate with engineering teams to convert quality standards into service-level requirements and well-defined acceptance criteria for platform functionalities and internal services.Manage the compliance process: define measurement criteria, introduce evaluative evidence (tests, checks, dashboards), and initiate corrective actions when discrepancies arise.Conduct structured quality assessments for internal services, including design reviews, readiness evaluations, release criteria, and post-incident analyses that refine standards and checks.Establish and maintain quality gates within the CI/CD pipeline that uphold standards without hindering team productivity (including contract checks, smoke/regression tests, and security assessments as applicable).Define quality benchmarks for public APIs and platform adapters regarding contracts, backward compatibility, and versioning.

Join our dynamic team at System Canada Technologies as a Senior Test Consultant, where you will play a pivotal role in enhancing our software quality and reliability. As a key member of our testing team, you will be responsible for designing and implementing robust testing strategies that ensure the delivery of high-quality software solutions to our clients.Your expertise will contribute to the continuous improvement of our testing processes, helping us to maintain our reputation for excellence in the tech industry. Collaborate closely with developers, project managers, and other stakeholders to create effective test plans and execute comprehensive testing scenarios.

As a Senior Quality Assurance Engineer at Hudl, you'll play a pivotal role in ensuring the quality and reliability of our cutting-edge software solutions. You will collaborate closely with development teams, utilizing your expertise to design and implement comprehensive testing strategies, automate testing processes, and contribute to the continuous improvement of our products. Your keen eye for detail and problem-solving skills will help us deliver exceptional user experiences.

About AntithesisAt Antithesis, we are transforming the landscape of modern distributed systems testing and deployment. Our innovative platform is trusted by engineering teams that prioritize unwavering reliability, scalable performance, and intricate technical insights. We don’t just ensure system correctness and reliability; we exist because developers need a superior solution. If you’ve faced the frustration of production outages, endured challenging on-call weeks, or experienced release delays due to critical bugs, you’ll resonate with our mission. If you're driven by a passion for developer-centric products, system resilience, and accuracy, we want to hear from you.About the RoleWe seek an innovative thinker who thrives in challenging environments and isn’t afraid to disrupt the norm. As a Solutions Engineer, you will deploy the powerful tools and technologies from the Antithesis platform to identify bugs and challenge our customers’ software. You will effectively communicate and persuade potential customers about the revolutionary approach to software testing and reliability that Antithesis embodies.What You'll DoLead Proof-of-Concept (POC) initiatives to showcase the value of Antithesis products to prospective customers.Engage in onboarding processes for new customers.Provide technical support to the sales team through qualifications and consultations.Facilitate workshops for customers focusing on Property-based Testing (PBT) and other relevant topics.Identify bugs and evaluate open-source software.Establish thought leadership in testing complex systems.Create, maintain, and present product demonstrations.Guide customers and prospects in utilizing the Antithesis platform and its testing methodologies.Who You AreTechnically adept and curious about technology trends.Eager for new challenges and opportunities.Keen to learn and adopt emerging technologies.Resilient under tight deadlines and high-pressure scenarios.Excellent communicator, both in writing and verbally.Collaborative team player, able to work effectively with a small, skilled team.Professional yet adaptable, comfortable in a fast-paced environment.