75 senior software engineer jobs found in London

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Fullstack Experience Tech Stack - Kotlin Backend, JS/TS React Frontend Start date ASAP Duration 6 months (Likely to extend) 2/3 days / week in person working (London) Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning.   We are based at Old Street in the heart of "tech city" and get thoroughly stuck in with the brilliant community around...

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Fullstack Experience Tech Stack - Kotlin Backend, JS/TS React Frontend Start date ASAP Duration 6 months (Likely to extend) 2/3 days / week in person working (London) Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning.   We are based at Old Street in the heart of "tech city" and get thoroughly stuck in with the brilliant community around...

Senior Software Engineer - AI-Assisted Legacy Medernisation   Outside IR35 - Contract (Insurance Client)   About the role   Softwire is helping our client modernise a business-critical legacy platform, moving it off Oracle Forms and onto a modern React and .NET stack, with the underlying Oracle database migrating to Azure SQL. We're looking for a strong full-stack contract developer to join the existing team and drive this migration forward. What sets this role apart is that the use of AI tools is the main focus, not a nice-to-have. You'll use tools such as Claude to accelerate the translation of Oracle Forms logic into the new stack and to support the database migration. We want someone who already works this way day to day and can show how AI changes the pace and quality of their delivery.   Key Responsibilities   Work alongside our team to migrate the legacy product onto a React / .NET architecture, keeping...

Senior Software Engineer x2 - Outside IR35 - Contract - (Energy Sector)   Softwire is helping deliver a project for a client of ours in the energy sector, and we're growing the team behind the Azure rebuild. We're looking for 2x Full Stack Software Developers, ideally with some data engineering experience, to join the team. You'll work across the stack, from refinement through to deployment, helping the team deliver well-tested, well-documented software while supporting the wider team through sprint ceremonies and code review.   Must have   Strong experience with Python Experience with Azure SQL Experience with Terraform Comfortable working across the full stack, from data layer through to delivery   Nice to have   Polars Temporal React / TypeScript Prior data engineering experience   What you'll be doing   Develop and deliver user stories and technical...

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Fullstack Experience Tech Stack - Kotlin Backend, JS/TS React Frontend Start date ASAP Duration 6 months (Likely to extend) 2/3 days / week in person working (London) Immediate Interviews The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages. Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning. We are based at Old Street in the heart of "tech city" and get thoroughly stuck in with the brilliant community around us. We run several...

On behalf of The Ministry of Justice, we are looking for a Senior Software Engineer (Python) (Inside IR35) for a 6 Month contract based Remotely with the occasional travel to any MOJ office. . The Ministry of Justice (MoJ) priorities include improving public safety and reducing reoffending by reforming prisons, probation and youth justice, and building a justice system which makes access to justice swifter and more certain for all citizens whatever their background. Project professionals in the MoJ help to improve the government's ability to protect the public and reduce reoffending, and to provide a more effective, transparent and responsive criminal justice system for victims and the public. SC Clearance is an essential requirement for this role, as a minimum you must be willing & eligible to undergo checks. Please note, due to the exceptional requirements of this position (short-term nature of this role and speed at which we require a postholder in situ)...

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Fullstack Experience Tech Stack - Kotlin Backend, JS/TS React Frontend Start date ASAP Duration 6 months (Likely to extend) 2/3 days / week in person working (London) Immediate Interviews The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages. Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning. We are based at Old Street in the heart of "tech city" and get thoroughly stuck in with the brilliant community around us. We run several...

Location - London, Manchester and Ipswich About the Role We are looking for a talented and motivated ServiceNow Developer to join our growing team. You will be responsible for designing, developing, and implementing solutions on the ServiceNow platform across a range of modules, supporting our public sector and government clients. Given the sensitive nature of the environments you will be working in, candidates must hold an active Security Check (SC) clearance. You will work closely with business analysts, architects, and stakeholders to deliver high-quality ServiceNow solutions that drive efficiency, automation, and improved service delivery across the organization. Key Responsibilities Design, develop, configure, and maintain ServiceNow solutions across key modules including ITSM, ITOM, HRSD, SecOps, GRC, and CSM. Develop custom applications, workflows, UI policies, business rules, client scripts, and script includes using JavaScript and the ServiceNow...

Title: Senior Growth Engineer - Contractor 👫 Department: Engineering 🎁 Benefits & Culture: Lottie’s careers page here , Lottie’s tech careers page here 🎥 Meet our CTPO: Solving hard problems in care 💗 Mission: Elevate later life for everybody and build the care sector of the future. 💻 Office Policy: Fully remote, you’ll need to be in Europe. Or hybrid if preferred. 🌍 HQ: London Bridge, London, UK   🔍 The Opportunity: Lottie's marketplace connects millions of families with the right care at the right time. We've built something real - now we need to grow it faster, smarter, and with more precision than a traditional engineering team can. We're looking for a Senior Growth Engineer to join a small, focused Marketplace team and own the full experiment loop - from hypothesis to code to result. You'll work closely with a PM and designer to run high-velocity tests, feed signals back to Google to...

Location: London 1-2 days a week. Department: Engineering Employment Type: Contract Contract Length: 6 months (with potential for extension) About YLD: Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done. About the role: As a Senior Software Engineer at YLD, you’ll be part of a client team building innovative products. We’re looking for someone curious, passionate, driven, and enthusiastic. You should be...

Description We are seeking a passionate Software Engineering Manager with a strong background in modern frontend engineering, particularly React, Next.js, and TypeScript, to provide technical leadership and operate with excellence. Creative, curious, and confident, you will be an integral part of our empowered, self-managing, multi-disciplinary engineering teams -designing, building, releasing, and maintaining high-quality digital products. You will play a key role in shaping and growing a best-in-class frontend engineering capability, establishing modern development practices and building scalable, high-performance web applications. This is an initial 6-month contract (outside IR35) requiring 3 days per week onsite in Paddington, London. Key Accountabilities Team Leadership Build, mentor, and lead a high-performing team of frontend engineers specialising in React, Next.js, and TypeScript. Foster a culture of collaboration, technical excellence, and continuous improvement....

Senior Data Engineer - Outside IR35 - Contract (Insurance Client) About the role Softwire is seeking an experienced Data Engineer with a strong knowledge of Python (including PySpark) and SQL, and a good understanding of software engineering best practices (including SDLC, CI/CD, automated testing, DevOps) to join an established small team working on delivering a data & analytics platform in Microsoft Fabric for a speciality insurance provider. This is a senior, hands-on role that will require owning and delivering workstreams independently while supporting a junior team member. Key Responsibilities Building new ingestion pipelines in Microsoft Fabric using Python (PySpark) notebooks Modelling data for consumption in Power BI through a dimensional gold warehouse layer and a semantic model Improving platform performance Working across cross-functional areas such as logging, monitoring (with Azure Log Analytics and Fabric) and data governance (within...

Must have skills: Demonstrable experience with Solidity. Strong understanding of blockchain security practices and potential vulnerabilities. Proficiency in Hardhat and Foundry. Experience with Solidity security testing tools like Slither, Mythril, Echidna Practical experience with scripting languages like Javascript or Typescript. Ability to craft unit, integration, fork, and invariant tests, ensuring code longevity. Demonstrable aptitude for best development practices, data structures, algorithms, and methodologies. Bachelor's degree in Computer Science, Engineering, or a related STEM discipline. Excellent debugging and troubleshooting skills. Strong written and verbal communication skills. Self-motivated with the ability to work in a fast-paced, evolving environment. Proficient communication skills in English. Development background in sectors such as banking, finance, or trading, paired with a comprehensive grasp of financial instruments and systems. Bonus...

Must have skills: Demonstrable experience with Solidity. Strong understanding of blockchain security practices and potential vulnerabilities. Proficiency in Hardhat and Foundry. Experience with Solidity security testing tools like Slither, Mythril, Echidna Practical experience with scripting languages like Javascript or Typescript. Ability to craft unit, integration, fork, and invariant tests, ensuring code longevity. Demonstrable aptitude for best development practices, data structures, algorithms, and methodologies. Bachelor's degree in Computer Science, Engineering, or a related STEM discipline. Excellent debugging and troubleshooting skills. Strong written and verbal communication skills. Self-motivated with the ability to work in a fast-paced, evolving environment. Proficient communication skills in English. Development background in sectors such as banking, finance, or trading, paired with a comprehensive grasp of financial instruments and systems. Bonus...

Senior Front End Engineer (Contract) – USA Tech Team     Contract Details Contract Length: Initial 12-month contract IR35 Status: Outside IR35 Location: Hybrid / Remote (UK) Day Rate: Competitive Start Date: ASAP     This is an opportunity to join Nando's USA Technology team on a long-term contract, helping build and scale the digital products that support our expansion across the USA. You'll work with a modern technology stack, solving complex engineering challenges and delivering high-quality customer-facing applications within a collaborative, agile environment.     Overall Ambition Help deliver exceptional digital experiences for Nando's customers across the USA by building modern, scalable and high-performing frontend applications using a contemporary technology stack.   You'll join a fast-moving engineering team delivering products that directly impact...

Who Are We? Xcelirate develops technologically-advanced platforms which are accessed by thousands of users every minute! We are proud to offer a workplace where the sharpest developers come together to strategically plan and swiftly execute practices which see us maintain our existing market dominance and attain global expansion. We owe our success to our customers who have seen us grow across a decade, and our talented team who have made that growth possible!   What are we looking for? You're a Principal-Level Engineer first. The tech lead title is almost incidental. It just means you're the person the team orbits around, because that's what happens naturally when you're the one who understands the system most deeply and keeps the clearest head under pressure. The 10% that's people management fits inside your engineering work, not alongside it. You hire, you steer, you unblock, but you do it the way a strong engineer does everything: with good...

Role: Senior Threat Modeler Location: London / Belfast Start Date: ASAP End Date: 6 Months Daily Rate: Competitive Day Rate, Inside IR35 Payroll provider – Rockford Payroll Info for Contingent Workers – Rockford Pay Responsibilities Threat Modeling using a documented process. Development of automation tools as required. Maintain a high standard of work in identifying threats and specifying mitigating controls. Attending to the lifecycle of identified threats and controls. Delivery of threat models and supporting tasks within existing timeframes. Provide feedback, support, and improvements to the existing threat modeling process. Present work to seniors, the team, and other technical teams. Train newer members of the team Supervise junior members of the team Run parts of our threat model service Work with little supervision to complete work Develop, test, and deploy secure and efficient Python-based...

Must have skills: Demonstrable experience with Solidity. Strong understanding of blockchain security practices and potential vulnerabilities. Proficiency in Hardhat and Foundry. Experience with Solidity security testing tools like Slither, Mythril, Echidna Practical experience with scripting languages like Javascript or Typescript. Ability to craft unit, integration, fork, and invariant tests, ensuring code longevity. Demonstrable aptitude for best development practices, data structures, algorithms, and methodologies. Bachelor's degree in Computer Science, Engineering, or a related STEM discipline. Excellent debugging and troubleshooting skills. Strong written and verbal communication skills. Self-motivated with the ability to work in a fast-paced, evolving environment. Proficient communication skills in English. Development background in sectors such as banking, finance, or trading, paired with a comprehensive grasp of financial...

AI Engineer £600pd Inside IR35 2-3 days on site in London Initial 6 month engagement AI Engineer £600pd Inside IR35 2-3 days on site in London Initial 6 month engagement emagine is a high-end professional services consultancy and solutions firm specialising in providing business and technology services to the financial services sector, we power progress, solve challenges and deliver real results through tailored high-end consulting services and solutions. We have created a culture of openness and integrity by building genuine and strong relationships and partnerships, enabling us to be uncompromising in our dedication in delivering the optimal service for our clients. Our commitment is not just towards our clients but we aim to foster a positive and equitable working environment with our consultants and colleagues which stems from our core values: Confident, Dedicated, Responsible, Genuine. We are seeking an experienced AI Engineer with a proven...

Job description   Job Title: Senior Cloud Engineer (contract) Location: London Hybrid. Travel to the London office 3 days a week Duration: 11 months Contract Start Date: ASAP *note client onboarding takes 6 weeks from offer Day Rate: Competitive (Inside IR35)   Deloitte Working with the Deloitte Associate (Contractor) Programme means we can offer you the opportunity to work on a variation of industry and client related projects. Our aim is to retain the best talent and so when your project end date nears our team of Talent Community Advisors will be working with you to look at alternative projects within the firm that suit your experience should you wish to continue with Deloitte.   The Role We are looking for experienced Senior Cloud Engineers to work in the Technology and Transformation Team at Deloitte. You will work with one of our global financial services clients....