South East London, England, United Kingdom Hybrid / WFH Options
Harnham
Role: SeniorSoftwareEngineer (Python) Salary: £100,000-£110,000 + Bonus WFH: Hybrid - 2-3 days/week in-office (Central London) Overview Our client is a profitable and fast-growing UK fintech helping over 800,000 customers improve their financial health. Backed by strong leadership and AI-driven innovation, the company is building a brand … new mobile app and scaling its engineering team to support rapid product delivery. They're now hiring a Senior Python Engineer to join this lean, high-impact team and help shape the future of fair, tech-driven credit products. Key Responsibilities Design, build and scale modern APIs and backend services in Python Lead technical delivery across greenfield and … Write maintainable, testable, high-performance code Influence architecture and mentor junior engineers Balance delivery with strategic thinking in a fast-moving environment Ideal Candidate 7+ years of experience in software engineering Strong Python (FastAPI, Flask, or Django preferred) AWS or Azure cloud exposure Frontend awareness (e.g. React) Agile mindset; thrives in lean, delivery-focused teams Passionate about AI and More ❯
East London, London, United Kingdom Hybrid / WFH Options
Areti Group | B Corp™
Urgent! x8 Fullstack SeniorSoftware Engineers/Tech leads Needed – UK-based – – Rapid Growth – Fully Remote 🌳 Areti Group is excited to partner with a Series funded startup poised for rapid expansion, growing by 40 heads in the next 3 months! We are urgently seeking x8 Fullstack Tech leads to join their high-performing team. This fully remote role … tech. Languages : 🌳 Ruby-on-Rails, Java, Python, C#, PHP 🌳 VueJs, Typescript/Angular/React Cloud : 🌳 Amazon Web Services (AWS) Databases : 🌳 PostgreSQL, DynamoDB Additional Tools & Frameworks : 🌳 GraphQL 🌳 REST APIs 🌳 Software Design Patterns – TDD, DDD 🌳 Agile methodologies: Scrum and Kanban Key Responsibilities : Full-Stack Development : Design, develop, and maintain complex full-stack applications across both front-end and back-end. … Cloud & Database Management : Build scalable, cloud-based solutions using AWS , PostgreSQL , and DynamoDB . API Development : Integrate RESTful APIs and GraphQL to enable smooth data flow between services. Software Design Patterns : Apply TDD (Test Driven Development) and DDD (Domain Driven Design) best practices to ensure maintainable, efficient code. DevOps & CI/CD : Use DevOps processes, including virtualization , containerization , and More ❯
East London, London, United Kingdom Hybrid / WFH Options
Opus Recruitment Solutions
I’m supporting a FinTech AI Product Company who are on the hunt for an experienced SeniorSoftwareEngineer to join their FULLY REMOTE engineering team! This is a seriously tech-driven product company that puts a huge emphasis on engineering excellence , innovation , and building something that genuinely helps users . They’re solving complex problems in … the FinTech + AI space, and as a SeniorSoftwareEngineer, you’ll play a key role in shaping the product and the tech behind it. You’ll work closely with the CTO and be deeply involved in: Defining architecture and making key technical decisions Leading on project delivery and mentoring other engineers Building greenfield features that … Scala , etc - Even more for code examples! Proven ability to lead projects (and teams) in fast-paced, innovative environments Strong decision-making skills and a passion for building great software Experience in FinTech or AI is a HUGE plus The Culture: They live and breathe technology and engineering excellence Agile, innovative, and always pushing boundaries Remote-first — always have More ❯
South East London, England, United Kingdom Hybrid / WFH Options
Opus Recruitment Solutions
I’m supporting a FinTech AI Product Company who are on the hunt for an experienced SeniorSoftwareEngineer to join their FULLY REMOTE engineering team! This is a seriously tech-driven product company that puts a huge emphasis on engineering excellence , innovation , and building something that genuinely helps users . They’re solving complex problems in … the FinTech + AI space, and as a SeniorSoftwareEngineer, you’ll play a key role in shaping the product and the tech behind it. You’ll work closely with the CTO and be deeply involved in: Defining architecture and making key technical decisions Leading on project delivery and mentoring other engineers Building greenfield features that … Scala , etc - Even more for code examples! Proven ability to lead projects (and teams) in fast-paced, innovative environments Strong decision-making skills and a passion for building great software Experience in FinTech or AI is a HUGE plus The Culture: They live and breathe technology and engineering excellence Agile, innovative, and always pushing boundaries Remote-first — always have More ❯
South East London, England, United Kingdom Hybrid / WFH Options
B4B Payments - A Banking Circle Group Company
Job Title : SeniorSoftwareEngineer (Ruby on Rails) Location: London/Remote/Hybrid Job Status: Permanent/Full-time About us B4B Payments is a multi-award-winning, global financial services technology company offering an advanced transaction payments platform and APIs for emerging payments and financial services. Our flexible technology and comprehensive services include embedded finances … and most successful companies around the world, as they accelerate the digitalisation of their customer and supply-chain. About the role We're looking for a UK based, experienced SoftwareEngineer with a deep knowledge of Ruby on Rails to join our friendly, well organised and product led dev team here at B4B Payments. You'll be working … a fun and fulfilling environment Design and implement new features as part of a product specific team led by a product owner Take ownership of the end-to-end software development lifecycle from technical specification through to testing and warranty Provide feedback and mentoring of your peers through the software development lifecycle Contribute ideas to improve how we More ❯
South East London, London, United Kingdom Hybrid / WFH Options
TYRENS UK
Job Title: S enior Software Developer Location: London (Hybrid) Job Type: Full-time (Permanent) Company: Tyréns UK At Tyréns UK , we believe in creating lasting impact through innovative design and engineering solutions. As a forward-thinking consultancy, were dedicated to shaping the future of infrastructure and urban development, all while prioritising sustainability, collaboration, and excellence. We're seeking a … highly driven SeniorSoftware Developer to join our expanding IT team. Under the guidance of the IT Director, this role will be responsible for developing both internal and external applications while overseeing the management of UK business systems, all within strict operational timelines. Working closely with the IT Director and management teams, the SeniorSoftwareEngineer will continuously review and enhance applications to ensure they align with the evolving needs of the business. This position spans the full software development lifecycle, from gathering initial user requirements and design to development, testing, and ongoing maintenance. The Role & Responsibilities The SeniorSoftware Developer will play a key role in delivering a best-in-class More ❯
South East London, England, United Kingdom Hybrid / WFH Options
Inara
Role: Contract Senior Java Engineer Location: London (Hybrid | 3 days onsite initially) Contract Length: 6-Month Contract | Inside IR35 | £600–£700/day We’re looking for an experienced Senior Java Engineer to join our consultancy delivery team, supporting a flagship project with one of the UK’s leading digital banks . You’ll be embedded More ❯
South East London, England, United Kingdom Hybrid / WFH Options
VST
and better data. We’re a venture-backed startup with solid foundations and a lot of ambition — and we’re growing our team. We’re now looking for a Senior Full Stack Engineer with strong TypeScript experience to join our collaborative, curious, and kind team. You’ll work across the full stack to build products that customers actually … love — shipping fast, thinking deeply, and owning your craft. Diversity & Belonging at VST We believe building great software starts with diverse thinking, lived experiences, and inclusive culture . We’re proud to be building a team where different perspectives aren’t just welcomed — they’re essential. Whether you’ve followed a traditional path or not, we encourage people of … and fast: Intro chat (30 min) – Meet our Talent Partner Tech review – Share past work or a small take-home (your choice) Live coding/system design – With a seniorengineer or our CTO Founder chat – Get to know us, and ask anything Offer Ready to Apply? There’s no such thing as a “perfect” candidate — if you More ❯
East London, London, United Kingdom Hybrid / WFH Options
Turing
About the projects: We are building LLM evaluation and training datasets to train LLM to work on realistic software engineering problems. One of our approaches, in this project, is to build verifiable SWE tasks based on public repository histories in a synthetic approach with human-in-the-loop; while expanding the dataset coverage to different types of tasks in … terms of programming language, difficulty level, and etc. About the Role: We are looking for experienced software engineers (tech lead level) who are familiar with high-quality public GitHub repositories and can contribute to this project. You should have experience working with well-maintained, widely-used repos with 500+ stars. This role involves hands-on software engineering work … accelerating the advancement and deployment of powerful AI systems. You’ll be at the forefront of evaluating how LLMs interact with real code, influencing the future of AI-assisted software development. This is a unique opportunity to blend practical software engineering with AI research. What does day-to-day look like: Analyze and triage GitHub issues across trending More ❯
East London, London, United Kingdom Hybrid / WFH Options
Areti Group | B Corp™
X20 SeniorSoftware Engineers Needed – Tech Start Up – Fully Remote - GO, Golang, PHP, GraphQL, GRPC, AWS, API, Microservices, Next.JS, React - Offices based in London but all roles are fully remote 🌳🌳🌳 Areti has partnered with a rapidly growing tech-led organization who are seeking multiple Software Engineers ranging from junior to senior and looking to grow their … team by a further 20 Software Engineers this year. They are one of the most exciting START-UPS in the UK! As a SoftwareEngineer, you will enjoy working on a variety of interesting and challenging projects and can work with various programming languages. On the other hand, if you are happy working in your niche and … the software languages you are most comfortable with then this is fine also. Culture, Fun, and self-development are words often heard in this organization so if you are a softwareengineer looking for a company with clear career and development opportunities then please reach out today. You will ideally have exposure to as many of these More ❯
South East London, England, United Kingdom Hybrid / WFH Options
Bounce Digital
Title: SoftwareEngineer (Fullstack/Frontend leaning) Salary/Package: £80k-£90k + Equity Company Sector: Fintech (Sustainability) Tech: TypeScript, Node, React, Next, GraphQL Location: Central London (London Bridge/Bank) WFH/Hybrid: 2 days a week on site We're teaming up again! Bounce is back partnering with one of our favourite customers — the same awesome … fintech crew we placed three top-notch software engineers with in 2024. Fast-forward to 2025: they’ve kicked things off strong and are growing again We’ve known the CTO for ages — genuinely one of the good ones. They’re making waves in the fintech space, bridging the gap between financial and sustainability data. Their platform makes it More ❯
South East London, England, United Kingdom Hybrid / WFH Options
Block MB
usage grows Drive architectural improvements and evaluate new tools/libraries Help productionise AI features (prompt tuning, prompt chaining, LLM orchestration, etc.) What We Look For 5+ years in software engineering, ideally across full stack environments Experience working on complex systems with meaningful scale A bias toward action and pragmatism: you ship working software quickly Strong product intuition More ❯
East London, London, United Kingdom Hybrid / WFH Options
Areti Group | B Corp™
SeniorSoftwareEngineer/Tech leads – React Native/PHP/React/Golang – Tech For Good -Scaleup Environment – 100% Project based – FULLY REMOTE – Offices based in UK 🌳🌳🌳 Candidates can be based anywhere in the UK as long as they are comfortable working in a remote environment. Areti Group has exclusively partnered with a rapidly growing fintech … company based in London who are building out a greenfield team and looking for up to 40 new Software Engineers with experience working with highly scalable microservice architecture by the end of the year. We are now on the lookout for Software Tech Leads/Staff Engineers who will tech control and direction of a number of different … software teams. These roles are FULLY REMOTE and offer you the choice of laptop and tech equipment to make sure you can be the best version of yourself. As a software team lead/staff engineer working for this organization, you must be able to show that you are willing to self-develop and have a real More ❯
South East London, England, United Kingdom Hybrid / WFH Options
Plan:it
a passion for building modern AI products utilising LLM's/Gen AI? This could be for you . Let me start with a snapshot of the role: Role : SeniorSoftwareEngineer (AI product) Stack : TypeScript, RoR, GraphQL, PostgreSQL n.b - most of the engineering team didn't know RoR before joining, so no worries if you don More ❯
East London, London, United Kingdom Hybrid / WFH Options
Areti Group | B Corp™
X15 Go/Golang SeniorSoftware Engineers – Fintech – Start-up/Scaleup Environment – 100% Project based – FULLY REMOTE – Offices based in LONDON 🌳🌳🌳 Candidates can be based anywhere in the UK as long as they are comfortable working in a remote environment. Areti Group has exclusively partnered with a rapidly growing fintech company based in London who are building … out a greenfield team and looking for up to 40 new Software Engineers with experience working with highly scalable microservice architecture by the end of the year. These roles are FULLY REMOTE and offer you the choice of laptop and tech equipment to make sure you can be the best version of yourself. As a softwareengineerMore ❯
East London, London, United Kingdom Hybrid / WFH Options
Turing
About Us Turing is one of the world’s fastest-growing AI companies, pushing the boundaries of AI-assisted software development. Our mission is to empower the next generation of AI systems to reason about and work with real-world software repositories. You’ll be working at the intersection of software engineering, open-source ecosystems, and frontier … AI. Project Overview We're building high-quality evaluation and training datasets to improve how Large Language Models (LLMs) interact with realistic software engineering tasks. A key focus of this project is curating verifiable software engineering challenges from public GitHub repository histories using a human-in-the-loop process. Why This Role Is Unique Collaborate directly with AI … researchers shaping the future of AI-powered software development. Work with high-impact open-source projects and evaluate how LLMs perform on real bugs, issues, and developer tasks. Influence dataset design that will train and benchmark next-gen LLMs. What does day-to-day look like: Review and compare 3–4 model-generated code responses for each task using More ❯