36 senior software engineer jobs found

Senior Software Engineer - Pricing & Availability (Node/React/.Net) We're supporting a high-traffic global travel and E-commerce platform in its search for a Senior Software Engineer to strengthen its pricing and availability systems. This is a hands-on contract role focused on improving the performance, reliability and scalability of a complex transactional platform processing millions of customer searches across multiple international markets. What you'll be working on: Building and improving pricing, quote-caching and availability services Designing resilient APIs and integration patterns Tackling latency, performance and infrastructure cost challenges Managing the trade-off between pricing freshness and cache efficiency Improving observability through monitoring, tracing and meaningful metrics Working alongside teams responsible for third-party integrations and booking systems Using AI coding tools as part of your day-to-day engineering workflow What...

Senior Software Engineer - Pricing & Availability (Node/React/.Net) We're supporting a high-traffic global travel and e-commerce platform in its search for a Senior Software Engineer to strengthen its pricing and availability systems. This is a hands-on contract role focused on improving the performance, reliability and scalability of a complex transactional platform processing millions of customer searches across multiple international markets. What you'll be working on: • Building and improving pricing, quote-caching and availability services • Designing resilient APIs and integration patterns • Tackling latency, performance and infrastructure cost challenges • Managing the trade-off between pricing freshness and cache efficiency • Improving observability through monitoring, tracing and meaningful metrics • Working alongside teams responsible for third-party integrations and booking systems • Using AI coding tools as...

Senior Software Engineer - Pricing & Availability (Node/React/.Net) We're supporting a high-traffic global travel and E-commerce platform in its search for a Senior Software Engineer to strengthen its pricing and availability systems. This is a hands-on contract role focused on improving the performance, reliability and scalability of a complex transactional platform processing millions of customer searches across multiple international markets. What you'll be working on: Building and improving pricing, quote-caching and availability services Designing resilient APIs and integration patterns Tackling latency, performance and infrastructure cost challenges Managing the trade-off between pricing freshness and cache efficiency Improving observability through monitoring, tracing and meaningful metrics Working alongside teams responsible for third-party integrations and booking systems Using AI coding tools as part of your day-to-day engineering workflow What...

Senior Software Engineer - Outside IR35 - Contract (Energy) About the role We are looking for a Senior Software Engineer (ideally with some Data Engineering experience) to join our client team in the energy trading sector. End date is not certain, but likely to be December 2026 or early Q1 2027. We are looking for experience in the following technologies: Microsoft Azure ecosystem Understanding of networking & security options in Microsoft Azure Infrastructure-as-code (preferably Bicep) Python Experience in the below would also be beneficial: Azure DevOps (pipelines) SQL We generally spend 2 days per week on-site with the client in central London (Monday & Thursday). £500-600 per day outside IR35 Start date: 10/08/2026 End date: December 2026 or early Q1 2027 About Softwire Softwire is a leading UK technology and strategy consultancy. From enterprise to government, we help visionary organisations turn...

Contract AI Engineer (Claude Code Specialist) Greater Manchester (2-3 days onsite per week) Outside IR35 3 - 6 months (with view to extend) Competitive Market Rate (dependent on experience) ASAP The Role We are seeking an experienced Contract AI Engineer (Claude Code Specialist) to lead the integration and optimisation of Anthropic's Claude Code ecosystem into our development workflows. You will build, fine-tune, and deploy agentic AI coding assistants to accelerate our software delivery. Key Responsibilities Requirements Local to or able to commute to Greater Manchester 2-3 days a week. Experience with automated testing and continuous integration tools. Strong programming skills (Python, TypeScript, or Go preferred). Deep understanding of LLM architectures, prompt engineering, and context management. Direct hands-on experience deploying and configuring Claude Code or similar agentic coding tools. Proven track record as an AI Engineer or...

Senior/Lead Software Engineer (Java) | Outside IR35 | Hybrid (2 Days Onsite in central London) A large retailer urgently seeks an experienced Senior Software Engineer with extensive Java expertise to take a lead role in the design,development and support of scalable, cloud-native Back End applications. Working within an Agile, DevOps environment, you'll help build high-performance microservices, APIs and event-driven solutions powering a next-generation fulfilment platform used at significant scale. This is an exciting greenfield programme, working alongside engineers, operations and product teams to deliver software that supports critical business operations. Essential Experience Extensive commercial experience developing enterprise applications with Java and Spring Boot Proven track record designing and delivering high-throughput, distributed microservices at scale Strong experience building event-driven architectures using Kafka Expertise with PostgreSQL and...

Role: QA Test Engineer Location: Fully Remote (UK Based) Type: Contract (Outside IR35) Duration: Initial 6 months Security Clearance: SC Clearance preferred, or eligible to obtain SC Clearance About the Role We are seeking two highly experienced Senior QA Engineers to play a pivotal role in a major new programme delivering complex, data-intensive systems . This is an opportunity to take ownership of quality across the full software life cycle, ensuring robust testing, data validation, and formal acceptance processes are Embedded from the outset. The successful candidate will work within a highly autonomous engineering team, helping to define quality standards, test strategies, and automated frameworks while validating large-scale data processing and streaming solutions. This role goes beyond traditional software testing and requires an individual who can take ownership of quality assurance, challenge assumptions, and build the evidence needed to support...

Senior Mobile Engineer Tech: Kotlin / Swift / Flutter / BLE / NFC Location: Hybrid (Angel, London – 2 - 4 days per month in office) Contract: Outside IR35 (client is exempt) Duration: 8–12 weeks Start: ASAP Rate: £400 - £525 per day The Opportunity: We're partnering with an innovative IoT technology business looking for a Senior Mobile Engineer to lead the build of a brand-new mobile activation app and SDK. This is a greenfield project, replacing a legacy application with a lightweight solution focused on BLE, NFC and background scanning for enterprise customers. You'll own the project from architecture through to delivery, working directly with the Head of Software in a fast-moving, engineering-led environment. What You'll Do: Build a new mobile app and SDK from scratch Develop BLE background scanning and NFC activation Work on both native iOS and native Android and use Flutter for some basic UI screens. Deliver production-ready...

Senior QA Engineer (Defence Sector)  Duration: 3 months inital (extension, likley)  Rate: £400 per day (Outside IR35) Working Patterns: Remote (Infrequent on-site travel to London / Belfast) Other: Active SC Clearance - Preffered, SC eligable - must have (Fast-tracked SC sponsorship is provided) Project Requirments:We're seeking a Senior QA Engineer to assure the quality of complex software and data-intensive systems, delivered into secure, highly regulated environments. This role goes beyond traditional functional testing, focusing on validating data flows, ensuring data integrity, and verifying that analytical outputs produce accurate and repeatable results against known reference cases. Key experience we're looking for: - Experience testing data-intensive systems, including validation of data pipelines, transformations, and end-to-end data quality. - Ability to assess quantitative, analytical, or model-driven outputs and verify results against expected reference cases. -...

Senior QA Engineer (Defence Sector) Duration: 3 months initial (extension, likely) Rate: £400 per day (Outside IR35) Working Patterns: Remote (Infrequent on-site travel to London/Belfast) Other: Active SC Clearance - Preffered, SC eligible - must have (Fast-tracked SC sponsorship is provided) Project Requirments: We're seeking a Senior QA Engineer to assure the quality of complex software and data-intensive systems, delivered into secure, highly regulated environments. This role goes beyond traditional functional testing, focusing on validating data flows, ensuring data integrity, and verifying that analytical outputs produce accurate and repeatable results against known reference cases. Key experience we're looking for: - Experience testing data-intensive systems, including validation of data pipelines, transformations, and end-to-end data quality. - Ability to assess quantitative, analytical, or model-driven outputs and verify results against expected reference...

Senior Geospatial Engineer | Outside IR35 | Remote SR2 are looking for a Senior Geospatial Engineer to support the development of scalable spatial data solutions for a cloud-based, data-driven platform. You'll join a cross-functional team, taking ownership of the pipelines and services used to ingest, process, validate, store and publish complex geospatial datasets. The Role You'll design and build robust geospatial workflows capable of handling data at scale. The role combines geospatial engineering, software development and cloud delivery, with the opportunity to influence technical standards, architecture and engineering best practice. Key responsibilities will include: Building pipelines for the ingestion, transformation, validation and publication of spatial data Developing scalable geospatial services and processing workflows Working with traditional and cloud-native spatial formats Consuming and publishing data through REST and OGC APIs Optimising spatial...

Azure | Databricks | SQL | Outside IR35 | Hybrid THE COMPANY We 're partnering with a global mining organisation that is investing heavily in the evolution of its enterprise data platform. Following significant growth and a wider transformation programme, they 're looking to bring in an experienced Senior Data Engineer to strengthen the technical capability of the team and support the delivery of several high-profile data initiatives. This is a business that places real value on engineering best practice and is looking for someone who can provide immediate technical expertise, influence engineering standards through delivery and help solve complex data engineering challenges across the organisation. THE ROLE This is a hands-on Senior Data Engineering contract where you 'll operate as a senior individual contributor within a highly collaborative team. Rather than leading people, you 'll lead technically, owning complex engineering problems, partnering with...

Senior QA Engineer (Defence Sector) Duration: 3 months inital (extension, likley) Rate: £400 per day (Outside IR35) Working Patterns: Remote (Infrequent on-site travel to London / Belfast) Other: Active SC Clearance - Preffered, SC eligable - must have (Fast-tracked SC sponsorship is provided) Project Requirments: We 're seeking a Senior QA Engineer to assure the quality of complex software and data-intensive systems, delivered into secure, highly regulated environments. This role goes beyond traditional functional testing, focusing on validating data flows, ensuring data integrity, and verifying that analytical outputs produce accurate and repeatable results against known reference cases. Key experience we 're looking for: - Experience testing data-intensive systems, including validation of data pipelines, transformations, and end-to-end data quality. - Ability to assess quantitative, analytical, or model-driven outputs and verify results...

Opportunity for Senior Java Engineers to join a software consultancy and play an important role delivering a greenfield project for a large client in the iGaming industry. You’d join a product-based team within a large engineering department and would be responsible for owning all aspects of the systems you work on, from design through to deployment and supporting them in production. You must have prior experience in the iGaming, betting or FS industries. Skills: • Java, Spring, REST APIs, AWS • Microservices and Distributed Systems • Kafka or RabbitMQ • TDD and CI/CD • Observability In return they're offering an initial 6-month outside IR35 contract paying up to £500pd. If youre interested and would like to know more, please apply through this advert and Ill be in touch.

Opportunity for Senior Java Engineers to join a software consultancy and play an important role delivering a greenfield project for a large client in the iGaming industry. You'd join a product-based team within a large engineering department and would be responsible for owning all aspects of the systems you work on, from design through to deployment and supporting them in production. You must have prior experience in the iGaming, betting or FS industries. Skills: Java, Spring, REST APIs, AWS Microservices and Distributed Systems Kafka or RabbitMQ TDD and CI/CD Observability In return they're offering an initial 6-month outside IR35 contract paying up to £500pd. If youre interested and would like to know more, please apply through this advert and Ill be in touch.

?? Senior Automation Engineer | Playwright | TypeScript | AI-Driven Testing | £400-440pd | Outside IR35 ?? Remote First (Occasional visits to the Cheshire office) ?? £400-440 per day ?? 3-Month Initial Contract ?? Outside IR35 Lead the evolution of modern test automation within a forward-thinking software business that's investing heavily in engineering excellence and AI-powered development. We're looking for an experienced Senior Automation Engineer who enjoys shaping quality practices, mentoring others and driving automation strategy-not just writing automated tests. This is an opportunity to influence how an engineering organisation approaches testing, embedding modern automation practices while championing the use of AI to improve software quality and delivery. The Opportunity You'll act as the technical lead for automation engineering, helping define best practices, improving automation frameworks and working closely with Product and Engineering teams to...

Senior DevOps Engineer 6-month contract Remote Working Outside IR35 Market Rates (c£500 to £525 per day) The Opportunity: Our client is supporting a major UK Government Agency on the delivery and operation of critical cloud-based digital services and is looking to appoint an experienced DevOps Engineer to join an established engineering team. This is an excellent opportunity to work within a modern AWS cloud environment, supporting the deployment, monitoring and continuous improvement of live services used across a high-profile government programme. The successful candidate will be a hands-on DevOps Engineer with strong AWS expertise, excellent troubleshooting skills and experience supporting production environments. You'll work closely with software engineers, architects and client stakeholders to ensure services remain secure, resilient and highly available. Skills and Experience: Essential Proven commercial experience as a DevOps Engineer, Cloud Engineer or...

Senior Mobile QA Engineer (iOS & Android) £350 to £400 per day | Outside IR35 | Initial 6-Month Contract | Hybrid (Stratford, London) | Immediate Start Available Our trusted partner within the Ed-Tech sector, employing over 10,000 people across 100 countries and supporting more than 600 million users globally, is seeking an experienced Senior Mobile QA Engineer to join a high-profile product engineering team developing innovative mobile learning applications. This role is ideal for a QA professional with extensive experience testing native and cross-platform mobile applications across iOS and Android environments, coupled with a strong background in test automation and modern Agile delivery practices. Key Responsibilities Lead quality assurance activities across mobile applications, ensuring exceptional user experience on both iOS and Android platforms. Develop and execute comprehensive test strategies, test plans and test cases. Design, implement and maintain automated...

Senior DevOps Engineer 6-month contract Remote Working Outside IR35 Market Rates (c£500 to £525 per day) The Opportunity: Our client is supporting a major UK Government Agency on the delivery and operation of critical cloud-based digital services and is looking to appoint an experienced DevOps Engineer to join an established engineering team. This is an excellent opportunity to work within a modern AWS cloud environment, supporting the deployment, monitoring and continuous improvement of live services used across a high-profile government programme. The successful candidate will be a hands-on DevOps Engineer with strong AWS expertise, excellent troubleshooting skills and experience supporting production environments. You'll work closely with software engineers, architects and client stakeholders to ensure services remain secure, resilient and highly available. Skills and Experience: Essential Proven commercial experience as a DevOps...

🚀 Senior Automation Engineer | Playwright | TypeScript | AI-Driven Testing | £400-440pd | Outside IR35 📍 Remote First (Occasional visits to the Cheshire office) 💰 £400-440 per day 📄 3-Month Initial Contract 🕒 Outside IR35 Lead the evolution of modern test automation within a forward-thinking software business that's investing heavily in engineering excellence and AI-powered development. We're looking for an experienced Senior Automation Engineer who enjoys shaping quality practices, mentoring others and driving automation strategy—not just writing automated tests. This is an opportunity to influence how an engineering organisation approaches testing, embedding modern automation practices while championing the use of AI to improve software quality and delivery. The Opportunity You'll act as the technical lead for automation engineering, helping define best practices, improving automation frameworks and working closely with Product and Engineering teams...