1 to 25 of 28 Performance Testing Jobs in Central London

Non functional Test Lead - £700 per day inside IR35 - London (hybrid 3 days per week in the office) - Performance testing experience Please note: This role requires candidates to be able to commute into the London office 3 days per week. La Fosse is partnering with a global organisation to recruit a Non-Functional Test Lead on a contract … basis. The role is responsible for defining and executing the non-functional testing strategy, including performance, load, and disaster recovery testing across multiple systems. Acting as a Subject Matter Expert (SME), the Test Lead will guide test design, execution, and analysis, ensuring system reliability, scalability, and performance, while identifying opportunities to improve processes and infrastructure. Key … requirements: Proven experience in documenting and implementing non-functional test strategies , including performance, load, stress, and disaster recovery testing Hands-on experience in performance testing tools (e.g., JMeter, LoadRunner, Gatling) and analyzing results to identify bottlenecks Experience planning and executing Disaster Recovery (DR) tests across multiple systems and applications (e.g., Endur, Kafka, TRM, FRAME, FDH, Discovery More ❯

do and turning feedback into perfect software, you’ll fit right in. What you’ll do Think like a user: design and execute test plans, test cases, and exploratory testing for iOS and/or Android apps Catch edge cases, regression bugs, performance hiccups, and accessibility gaps before they reach our customers Collaborate with product managers, designers, and … release readiness activities: release notes, risk assessments, and sprint reviews Help shape QA processes, promote quality culture, and share learnings with the team What we’re looking for Experience testing mobile apps on iOS and/or Android (hands-on in a product/web/mobile app environment) Strong eye for detail and a user-centric mindset Familiarity … issue tracking, and test case management Ability to write clear, reproducible bug reports and communicate effectively with cross-functional teams Optional but nice-to-have: basic automation scripting, API testing, performance testing, accessibility testing Bonus: knowledge of mobile devices, OS versions, and real-device testing vs. emulators/simulators What you’ll bring A collaborative More ❯

Performance & QA Engineer - AWS - Outside IR35 Rate: £700 per day IR35: Outside Duration: 6 Months Contract Location: London - Hybrid Key Responsibilities Define and execute QA and testing strategies aligned with infrastructure delivery goals. Develop and maintain automated testing frameworks and performance benchmarking tools . Integrate QA practices within AWS infrastructure delivery — e.g., audit services for IAM … and Engineering teams to ensure reliability and scalability across all environments. Essential Skills & Experience Proven background in AWS (hands-on with cloud infrastructure and services). Strong knowledge of performance development testing and automation frameworks . Experience with API and backend testing tools (e.g. Postman, JMeter, Locust, or similar). Ability to design and implement performance testing strategies and benchmarking frameworks . Solid understanding of QA integration in CI/CD pipelines and infrastructure-as-code environments. APPLY NOW More ❯

candidates will be required to commute into the London office twice a week. La Fosse have partnered with a London-based client to recruit for a role focused on performance and web testing. The ideal candidate will have strong experience with JMeter for performance testing and UI automation expertise using Selenium with C#. Key requirements: - Proven experience … in UI automation using Selenium with C#/.NET. - Strong background in load & performance testing with JMeter. - Skilled in designing, executing, and analyzing performance test cases. - Proficient in Zephyr for Jira for test management and defect tracking. Please reach out to me directly if this is of interest More ❯

Infrastructure and Software Tester +Permanent opportunity +Hybrid working on site in London 2/3 days a week +£42,000 - £45,000 Skills: +Software Testing experience +Infrastructure Testing experience +AWS/Azure +API +Manual and automated testing experience We’re looking for a hands-on Tester who’s as comfortable checking infrastructure deployments and systems performance … environments — from cloud setups and APIs to end-user interfaces — ensuring everything we ship is rock solid, performant, and secure. This isn’t a “click-around-and-tick-boxes” testing role. We need someone with strong technical grounding, curiosity, and the confidence to dive into environments beyond just the front end. Key Responsibilities Execute and maintain test plans for … backend services, and application layers. Validate deployments, configuration changes, and environment stability across cloud and on-prem environments (AWS, Azure, GCP, CI/CD). Perform integration, regression, and performance testing across multiple platforms. Collaborate with DevOps, Developers, and Product teams to identify and resolve issues early in the lifecycle. Contribute to continuous improvement of QA practices, tools More ❯

clear reproduction steps, prioritization, and supporting visuals (screenshots or videos). Collaborate closely with product managers, designers, and engineers to understand user journeys and technical requirements. Conduct regression, compatibility, performance, and exploratory testing across various devices, OS versions, and screen sizes. Validate fixes and confirm resolution of reported issues. Help define and refine QA metrics and contribute to … in release planning and provide input on potential risks. Support test automation initiatives and assist with managing test environments and data. 🧠 What We’re Looking For Hands-on experience testing mobile apps on iOS and/or Android (using real devices or emulators). Solid grasp of mobile QA practices including functional, usability, compatibility, and performance testing. Familiarity … collaborative attitude. Strong communication skills in English—both written and verbal. 🌟 Bonus Skills Experience working with CI/CD pipelines and integrating tests into build workflows. Knowledge of API testing tools such as Postman. Awareness of accessibility testing and inclusive design principles. Familiarity with mobile performance testing and monitoring tools. 🎓 Qualifications Degree in Computer Science, Engineering More ❯

The organisation is transitioning from legacy systems to a cloud-native, Kafka-based architecture designed for resilience, scalability, and performance. You’ll be part of a growing Non-Functional Testing (NFT) team responsible for ensuring that services and platforms meet the highest standards for performance, reliability, and operational readiness. This is a technically rich role, working across multiple … domains including performance, failover, disaster recovery, resilience, alerting, and monitoring. Responsibilities Define, document, and execute Non-Functional Requirements (NFRs) across distributed microservices and infrastructure components. Collaborate with architects, product owners, and engineering squads to translate NFRs into measurable test scenarios. Develop and implement NFT strategies covering performance, scalability, failover, DR, resilience, alerting, and monitoring. Design and execute load … standard tools such as JMeter, LoadRunner, or ADS. Set up observability dashboards (Grafana, Splunk, Dynatrace, Kibana, or Datadog) to monitor test execution and system performance. Analyse results to identify performance bottlenecks, system vulnerabilities, and areas for optimisation. Report findings and recommendations clearly to both technical and non-technical stakeholders. Contribute to test automation frameworks, CI/CD integration, and More ❯

continuous improvement and transparent reporting. About the Role In this role, you will be responsible for leading the quality strategy and ensuring high-quality releases through collaboration and effective testing practices. Responsibilities Quality Strategy & Planning Collaborate with Product Owners & Tech PMs to understand project goals, scope, and acceptance criteria. Define comprehensive test strategies (functional, integration, system, regression, security, usability … . Develop detailed test plans, test cases, and test data aligned with project timelines and risk profiles. Hands-On Test Execution Lead and participate in testing activities (manual & automated) across web and backend services. Collaborate with the test automation team to promote shift-left practices and CI/CD integration. Validate defect fixes, perform root-cause analysis, and ensure … blockers and ensure on-time delivery. Foster a culture of collaboration, learning, and accountability through code/test reviews and coaching. Define career development goals; conduct regular feedback and performance evaluations. Progress Tracking & Reporting Maintain daily, weekly, monthly metrics (test coverage, defect density, velocity, automation rate). Build and maintain QA dashboards in tools like Jira, TestRail, or equivalent. More ❯

Tester +Permanent opportunity +Hybrid working on site in London 2/3 days a week +£42,000 - £45,000 Skills: +Software Testing experience +AWS/Azure +API +Manual and automated testing experience We're looking for a hands-on Tester who's as comfortable checking infrastructure deployments and systems performance as they are validating user journeys … environments - from cloud setups and APIs to end-user interfaces - ensuring everything we ship is rock solid, performant, and secure. This isn't a "click-around-and-tick-boxes" testing role. We need someone with strong technical grounding, curiosity, and the confidence to dive into environments beyond just the front end. Key Responsibilities Execute and maintain test plans for … backend services, and application layers. Validate deployments, configuration changes, and environment stability across cloud and on-prem environments (AWS, Azure, GCP, CI/CD). Perform integration, regression, and performance testing across multiple platforms. Collaborate with DevOps, Developers, and Product teams to identify and resolve issues early in the lifecycle. Contribute to continuous improvement of QA practices, tools More ❯

Rate : £650-850/d inside IR35 X4 Technology are partnering with a global energy trading firm on a major energy trading & risk management (ETRM) transformation aimed at enhancing performance, streamlining processes and scaling operations across the full deal lifecycle. The programme will deliver a robust, efficient platform that drives sustained growth and significant operational cost savings. As part … of this transformation, the business is establishing a high-impact testing function . These leadership roles will be pivotal in ensuring system quality, validating functionality and performance, and driving the programme’s strategic objectives. QA Lead (x3): Accountable for end-to-end testing deliverables across the portfolio, ensuring consistently high-quality outputs Driving innovation to improve functional … manual and automation testing practices. UAT Lead: Accountable for delivering a complete UAT schedule, including test scripts, scenarios and execution steps. Collaborating closely with programme teams to ensure requirements are fully testable Non-Functional Test Lead Accountable for the non-functional testing strategy, documenting approaches and execution plans Planning and leading performance testing across the ecosystem More ❯

Tester +Permanent opportunity +Hybrid working on site in London 2/3 days a week +£42,000 - £45,000 Skills: +Software Testing experience +AWS/Azure +API +Manual and automated testing experience We’re looking for a hands-on Tester who’s as comfortable checking infrastructure deployments and systems performance as they are validating user journeys … environments — from cloud setups and APIs to end-user interfaces — ensuring everything we ship is rock solid, performant, and secure. This isn’t a “click-around-and-tick-boxes” testing role. We need someone with strong technical grounding, curiosity, and the confidence to dive into environments beyond just the front end. Key Responsibilities Execute and maintain test plans for … backend services, and application layers. Validate deployments, configuration changes, and environment stability across cloud and on-prem environments (AWS, Azure, GCP, CI/CD). Perform integration, regression, and performance testing across multiple platforms. Collaborate with DevOps, Developers, and Product teams to identify and resolve issues early in the lifecycle. Contribute to continuous improvement of QA practices, tools More ❯

REST, IPC), WebUI, and OTA updates Integrate automated tests into CI/CD pipelines with quality gates Document standards and best practices for automation and quality engineering Support manual testing efforts and mentor peers in automation techniques 🧠 Technical Skills Proficient in Python, Java, or similar for test automation Experienced with tools like Selenium, Appium, Espresso Familiar with CI/… CD platforms such as Jenkins, GitHub Actions, Azure DevOps Strong testing background in device OS, APIs, web interfaces, and connected systems Bonus: Exposure to medical device software, video protocols, performance testing, and IEC 62304 standards 👤 Candidate Profile Software engineering background with a focus on automation Self-driven and technically adept with a passion for product quality Proven … or software development roles 🎓 Qualifications Bachelor’s degree in Computer Science, Engineering, or equivalent 3+ years of relevant experience (or 2+ years with advanced degree) Strong foundation in automation testing and technical leadership About Planet Pharma: Planet Pharma is an American parented Employment Business/Agency that provides global staffing services with its head-quarters in Chicago and our More ❯

quality releases. Provide guidance and support to internal teams and third-party vendors. Required Skills & Experience: Proven E2E test automation experience using Playwright, Cypress, or Selenium. Expertise in UI testing (visual regression, responsive design, cross-browser). Strong API testing (REST/GraphQL) – automated and manual. Proficiency in JavaScript/TypeScript; Python experience is a plus. Solid understanding … ideally in Cash Equities. Strong analytical mindset, excellent communication skills, and high attention to detail. Desirable: Experience creating test frameworks from scratch. Familiarity with CI/CD pipelines, accessibility testing, or performance testing. ISTQB/ISEB certification. Knowledge of financial products such as Derivatives, Bonds, or Asset Management. More ❯

/or complex implementations. Responsibilities As a trusted advisor, technical solution architect, and technical consultant, the TECHNICAL LEAD role provides technical architect consulting services, including: Holistic technical design reviews Performance and scalability Optimization of integrations and NetSuite customizations Data management consultation and guidance Consultative guidance on ERP leading practices Using deep technical experience, TECHNICAL LEADs analyze customers' business & technical … and presenting concepts effectively at various levels within a customer's and/or partner's organization Strong analytical skills Demonstrated expertise in one or more of the following: performance, integrations, technical architecture or software development Demonstrated experience in end-to-end business process flows Hands on Experience in the following areas are required: Performance and scalability of … ERP systems (Oracle EBS, Oracle Fusion, PeopleSoft, JD Edwards, NetSuite) Orchestrating and executing load and performance testing Tuning of SQL statements ODBC/JDBC data extraction strategy , design and tuning Data Modeling SaaS/Cloud architectures Oracle database architecture Architecting and tuning integrations (with products like Oracle Integration Cloud, Boomi, Mulesoft, Celigo, Workato or Snaplogic) ETL tools and More ❯

using Control-M and improve margin run performance. Implement trade compression and portfolio margining solutions. Collaborate with cross-functional teams to refine business requirements and deliver scalable solutions. Conduct performance testing and capacity analysis. Participate in agile ceremonies and act as Scrum Lead when required. Required Skills & Experience: 5+ years of Murex development experience, ideally within FX or More ❯

/3 days per week on site in central London. The Role Build and automate production and test infrastructure using Terraform, Ansible, and related tools Operate secure, high-performance systems across bare-metal and cloud environments Manage networking, databases, and blockchain nodes with a focus on scalability and uptime Implement and maintain CI/CD and GitOps workflows Collaborate … cross-functionally to ensure performance, reliability, and cost efficiency Requirements 5+ years of experience managing production backend systems at scale Cloud and on-premise infrastructure (AWS, GCP, etc.) Kubernetes and container orchestration Networking, observability, and data systems (relational, in-memory, time-series) Infrastructure-as-code (Terraform, Ansible) Proven experience building fault-tolerant, secure, and automated systems Familiarity with performance testing, chaos engineering, and security best practices Excellent communication and collaboration skills Bonus points Experience in high-growth startup environments Interest or background in blockchain, DEXs, or DeFi Knowledge of EVM systems or perpetuals trading If this role looks interesting, please apply directly. More ❯

Oversee end-to-end delivery of technology solutions, from requirements gathering to deployment. Define and manage delivery plans, timelines, and milestones in collaboration with project managers. Monitor progress and performance of technical team, ensuring deliverables meet quality, scope, and time expectations. Technical Leadership Provide technical direction and oversight to development team. Ensure adherence to solution architecture, coding standards, and … vulnerability and code scan, ensure code quality checks, solutions are high-quality, secure, and scalable. Collaborating with Operational Risk and Operational Resilience implement and enforce quality assurance processes, including testing, code quality checks, and performance reviews. Process Improvement & Governance Promote agile and DevOps practices for faster, iterative delivery. Continuously improve delivery frameworks, methodologies, and tools. Post-Delivery Support … Transition Coordinate knowledge transfer to operations/support teams. Transition delivery for post-deployment support, solution performance monitoring, and post-launch issues resolution. Key Skills/Experience: Platform-Specific Microsoft Power Platform (PowerApps, Power Automate, Dataverse): Understanding of custom app development, connectors, and governance. Enterprise Tools: Experience with tools such as SharePoint, Dataverse, Dynamics 365, Azure DevOps. API Enterprise More ❯

Oversee end-to-end delivery of technology solutions, from requirements gathering to deployment. Define and manage delivery plans, timelines, and milestones in collaboration with project managers. Monitor progress and performance of technical team, ensuring deliverables meet quality, scope, and time expectations. Technical Leadership Provide technical direction and oversight to development team. Ensure adherence to solution architecture, coding standards, and … vulnerability and code scan, ensure code quality checks, solutions are high-quality, secure, and scalable. Collaborating with Operational Risk and Operational Resilience implement and enforce quality assurance processes, including testing, code quality checks, and performance reviews. Process Improvement & Governance Promote agile and DevOps practices for faster, iterative delivery. Continuously improve delivery frameworks, methodologies, and tools. Post-Delivery Support … Transition Coordinate knowledge transfer to operations/support teams. Transition delivery for post-deployment support, solution performance monitoring, and post-launch issues resolution. Key Skills/Experience: Platform-Specific Microsoft Power Platform (PowerApps, Power Automate, Dataverse): Understanding of custom app development, connectors, and governance. Enterprise Tools: Experience with tools such as SharePoint, Dataverse, Dynamics 365, Azure DevOps. API Enterprise More ❯

Oversee end-to-end delivery of technology solutions, from requirements gathering to deployment. Define and manage delivery plans, timelines, and milestones in collaboration with project managers. Monitor progress and performance of technical team, ensuring deliverables meet quality, scope, and time expectations. Technical Leadership Provide technical direction and oversight to development team. Ensure adherence to solution architecture, coding standards, and … vulnerability and code scan, ensure code quality checks, solutions are high-quality, secure, and scalable. Collaborating with Operational Risk and Operational Resilience implement and enforce quality assurance processes, including testing, code quality checks, and performance reviews. Process Improvement & Governance Promote agile and DevOps practices for faster, iterative delivery. Continuously improve delivery frameworks, methodologies, and tools. Post-Delivery Support … Transition Coordinate knowledge transfer to operations/support teams. Transition delivery for post-deployment support, solution performance monitoring, and post-launch issues resolution. Key Skills/Experience: Platform-Specific Microsoft Power Platform (PowerApps, Power Automate, Dataverse): Understanding of custom app development, connectors, and governance. Enterprise Tools: Experience with tools such as SharePoint, Dataverse, Dynamics 365, Azure DevOps. API Enterprise More ❯

you sweat details and outcomes. AI-native builder : Cursor, v0 , Claude Code (and friends) are daily drivers for rapid prototyping and refactors. React + TypeScript mastery: component design, hooks, performance, testing (Vitest/Jest, Playwright). FastAPI expertise: async patterns, Pydantic schemas, pagination, auth (OAuth2/OIDC), rate-limits, background jobs. Elasticsearch fluency: mappings/analyzers (ngrams, synonyms … aggregations, filters, sorting, performance tuning. Cloud & DevOps : solid experience on AWS and/or GCP , Docker, Terraform, GitHub Actions, monitoring/alerts. Datastores : Postgres (SQL, migrations), Redis (caching/queues). Quality & security : code reviews, type safety, lint/format, secrets mgmt, least-privilege IAM, basic SOC2 hygiene. Communicates clearly with product sense; ships value weekly. About Clarity Anecdote More ❯

dedicated UX/UI designer, engaging in rapid daily iteration to translate high-fidelity, interactive prototypes into pixel-perfect, production-ready code. Real-Time Data Streaming: Engineer the high-performance “live transcript” view, which displays the AI-screened conversation as the phone is ringing . This involves consuming real-time streaming text data from our backend AI orchestration layer … via WebSockets. Mastering Perceived Performance: Implement the critical “mid-call intervention” feature, allowing a user to seamlessly accept a call from the AI agent. You will become an expert in designing for our < 1000ms V2V (voice-to-voice) latency budget, ensuring the entire UX flow feels fast and responsive. API & Backend Integration: Partner with our backend (Application & AI Orchestration … models required to power the Welcome Manager's features, from live transcription to post-call entity-extracted summaries. MWC Demo Ownership: Be directly responsible for the polish, stability, and performance of the Welcome Manager application for its critical debut at MWC 2026. Cross-Functional Partnership: Collaborate closely with the other Senior Android Engineer (who owns the native CallScreeningService and More ❯

dedicated UX/UI designer, engaging in rapid daily iteration to translate high-fidelity, interactive prototypes into pixel-perfect, production-ready code. ? Real-Time Data Streaming: Engineer the high-performance live transcript view, which displays the AI-screened conversation as the phone is ringing . This involves consuming real-time streaming text data from our backend AI orchestration layer … via WebSockets. ? Mastering Perceived Performance: Implement the critical mid-call intervention feature, allowing a user to seamlessly accept a call from the AI agent. You will become an expert in designing for our < 1000ms V2V (voice-to-voice) latency budget, ensuring the entire UX flow feels fast and responsive. ? API & Backend Integration: Partner with our backend (Application & AI Orchestration … models required to power the Welcome Manager's features, from live transcription to post-call entity-extracted summaries. ? MWC Demo Ownership: Be directly responsible for the polish, stability, and performance of the Welcome Manager application for its critical debut at MWC 2026. ? Cross-Functional Partnership: Collaborate closely with the other Senior Android Engineer (who owns the native CallScreeningService and More ❯

skills and familiarity with project management tools Foundational knowledge of technical infrastructure and how applications integrate within enterprise environments It would be a bonus if you had: Experience overseeing testing activities such as functional, security, and performance testing A background in service management and application support transitions This is a fantastic opportunity to join a progressive organisation More ❯

Lead Optimisation Engineer – Python/Pyomo/Gurobi 💻 Fully Remote (UK) | 🏙 2 Days in London Office per Month 💰 Base Salary up to £85,000 + Performance Bonus Are you a problem-solver who loves applying mathematical models to real-world optimisation challenges? We’re looking for a Lead Optimisation Engineer to take ownership of a core optimisation engine that … platform. This is an ideal next step for a 2nd-job engineer ready to move from supporting optimisation projects to leading them — with full exposure to product, architecture, and performance tuning. What You’ll Be Doing Designing, implementing, and maintaining MILP optimisation models using Pyomo and Gurobi/SCIP . Researching and prototyping new optimisation methods to improve runtime … solution quality. Managing API operations end-to-end — from schema design to orchestration and integrations. Refining methodologies including refill, extrapolation, benchmarking, and recosting. Reviewing and QA’ing code, running performance testing, and owning debugging cycles. Collaborating closely with product and engineering leads to prioritise features and manage technical debt. Engaging with stakeholders to troubleshoot and propose optimisation improvements. More ❯

low-code UI and no-code workflow builder Shape backend architecture with Python (Pydantic, Mypy, Pytest, etc.) Contribute across both frontend and backend Define engineering best practices for typing, testing, CI/CD, and code quality Integrate AI agent tooling and third-party APIs Collaborate with product, design, and infra teams to build real-time collaboration features The ideal … Claude etc is beneficial Generative AI Product experience Production-grade Python skills Frontend experience with Vue + TypeScript , or React and a willingness to learn Vue Understanding of web performance, testing, REST APIs, OAuth Comfort working in fast-paced, ambiguous environments Bonus: experience with devtools, no-code/low-code, AI tools, or OSS contributions This is a More ❯