1 to 25 of 72 Permanent Senior Software Engineer Jobs in London

Senior Software Engineer (Python) – Reducing Carbon Emissions with Machine Learning! Python on AWS £90-£110,000 per annum plus stock London Office - 1-2 days a week Are you a Senior Software Engineer with a passion for working with curious, humble colleagues to build … exceptional customer-focused products using Python? Do you align with their principles – “Work as much as you want, where you want” - giving Software Engineers the autonomy and support to perform at their best? Do you want to be part of a period of significant growth and opportunity, shaping elegant ...

Senior Software Engineer – JavaScript/Node.js A fantastic opportunity for an experienced Senior Software Engineer to join a market-leading AI software company that is transforming how large enterprises operate globally. This organisation has experienced exceptional growth in recent years … looking to appoint a highly capable Senior Engineer to lead complex engineering initiatives, take ownership of key technical decisions, and play a pivotal role in shaping the future of an advanced AI-driven platform. Location – You can choose to be based from the London or Cambridge office ...

Senior Software Engineer Central London | Hybrid £100k–£140k + bonus + equity Python, Databricks, AWS/GCP, Kubernetes We’re hiring a Senior Software Engineer to join a well-funded data business operating in the government/intelligence space. This Senior Software Engineer role sits within the Core Engineering team, working on a high-scale data platform analysing complex transaction data. It’s a technically challenging environment with real-world impact. As a Senior Software Engineer, you’ll optimise ETL/ELT pipelines (batch & streaming), improve architecture ...

Senior Software Engineer | Senior Engineer | Senior Full Stack Engineer 💰Up to £110,000 per annum 🏡Office based in Central North-West London, 2 days a week in office 💻TypeScript, Node.js, React.js. My client are a Series A–funded startup building a product … company scales globally. The team works at pace, close to users, and on real-time data problems , making this a strong fit for senior engineers who enjoy ownership, ambiguity, and building meaningful products from the ground up. You’ll work end to end across the application, contributing to product ...

Senior Software Engineer Location: London - Hybrid Salary: £70,000-85,000 Tech stack: Typescript & Node.js Maxwell Bond have partnered with a leading SaaS business who are looking for a Senior Software Engineer, with a focus on frontend development, to join their team. … work on one of the largest complex platforms for an enterprise client, being hands-on throughout the full software development lifecycle. What you'll do as Senior Software Engineer: Design, build and maintain full stack development for an enterprise platform, taking ownership from initial design through ...

Senior Software Engineer | Distributed Systems | Sustainable Cloud Native Platform 💸Up to £110,000 per annum plus bonus plus stock 🏠Central London office 🖱️Golang, Rust, C, Kubernetes, Linux, Cloud Native, Distributed systems... Are you a Senior Software Engineer with extensive knowledge of building distributed systems … so... I'm partnered with a very exciting Cloud scale-up who have received record Series A funding and are looking for innovative Senior Software Engineers to join their ambitious team! With a new VP of Engineering who has spent much of their career building out a world ...

Senior Software Engineer/Developer (Java AWS Kafka) London/WFH to £140k Are you a Java technologist who enjoys building systems from scratch? You could be progressing your career, in a senior, impactful role at a global, cloud-native, prime broker that is replacing … custody system, designed for today's complex global markets. The company is experiencing great success and is expanding into the UK. As a Senior Software Engineer you will take ownership of building a brand new Futures Trading platform for the UK, primarily using Java with a focus ...

Senior Java Full Stack Software Engineer - Public Sector Digital Transformation Location: UK (Fully Remote) Type: Permanent Security Clearance: SC cleared/eligible Use your engineering expertise to improve services that millions rely on. We're hiring a Senior Software Engineer to join a mission … high-quality engineering, enjoy mentoring others, and want your work to have real public impact, this role is for you. The Role As a Senior Software Engineer (Full Stack) you'll design, build and deploy scalable, secure and well-tested software solutions. You'll contribute ...

Role: Senior Software Engineer Location: Canary Wharf, Central London Salary: £70,000-£75,000 Plus Hybrid/Flexible Working, Company Bonus, Generous Pension and more. We are working with a well-funded, mission-driven organisation in the renewable energy space looking to hire a Senior Software Engineer into a core engineering team. You’ll be working on complex, large-scale platforms supporting critical infrastructure at a national level. This is a high-impact engineering environment where strong technical input genuinely matters. You’ll be responsible not just for building software, but for contributing ...

Software Engineer (Mid–Senior) Python Full Stack A fast-growing, technology-led consumer health & beauty scale-up is looking for a mid-level to senior Software Engineer to join its collaborative engineering team. The business builds and operates multiple direct-to-consumer brands, supported … opportunity to influence architecture, tooling, and engineering best practices as the platform continues to scale. This is a great opportunity for an engineer who enjoys ownership, autonomy, and seeing their work have real-world impact. What you’ll be doing as a Software Engineer Designing, building ...

Senior Software Engineer - Python - London Salary: Up to £90,000 Location: Hybrid 2 days per week in Canary Wharf (E14) Contract: Permanent, Full Time Interviews: WC 9th February Agency Partner: dcoded The Business dcoded are partnering with a high-growth Real-Time Data SaaS business based … data at scale, supporting: The business is entering a significant growth phase and is expanding its engineering team. The Role We are hiring a Senior Software Engineer to work on external, customer-facing SaaS platforms not internal IT systems. This is a hands-on role covering ...

Senior Software Engineer Key Technologies: C#, .NET, React, JavaScript, Typescript, AWS, Docker City of London, United Kingdom Perm Role: £80,000 - £120,000 Harrington Starr has partnered with a Global Financial Services Vendor and they are looking for a Senior C#, .NET Software Engineer … work in the UK. This role offers hybrid working, with an office location based in the City of London. This role will suit a Senior Software Engineer, with expert C#, .NET experience having a direct impact from the get-go. ...

Software Engineer (MidSenior) Python Full Stack A fast-growing, technology-led consumer health & beauty scale-up is looking for a mid-level to senior Software Engineer to join its collaborative engineering team. The business builds and operates multiple direct-to-consumer brands, supported … opportunity to influence architecture, tooling, and engineering best practices as the platform continues to scale. This is a great opportunity for an engineer who enjoys ownership, autonomy, and seeing their work have real-world impact. What youll be doing as a Software Engineer Designing, building, and deploying ...

Senior Software Engineer | London (hybrid) | £85k - £99k + Equity | Python | FastAPI | SaaS Location: London (hybrid) Salary: £84,000 to £99,000 plus equity Tech Stack: Backend: Python (FastAPI), experience in any strongly typed language is required Frontend: TypeScript (Vue.js) Cloud Systems: experience across any GCP, Azure … Senior Backend Engineer who wants to own the backend properly, not babysit it? We are working with a fast growing AI startup that is already live with enterprise customers, real revenue, and real technical complexity. The platform is multi-tenant, data heavy, and deeply tied to AI powered ...

Senior Software Engineer Hybrid (2-3 days onsite, Central London) | £75,000 - £85,000 + benefits A high-growth technology company operating at the intersection of real-time data, analytics, and cutting-edge product development is entering an ambitious expansion phase and is looking to hire … Senior Software Engineer to play a key role in its next stage of growth. This is an opportunity to work on mission-critical, real-time systems used at scale, with genuine ownership across architecture, development, and delivery. The role is hands-on, commercially focused, and suited ...

Senior Software Engineer Hybrid (2-3 days onsite, Central London) | £75,000 - £85,000 + benefits A high-growth technology company operating at the intersection of real-time data, analytics, and cutting-edge product development is entering an ambitious expansion phase and is looking to hire … Senior Software Engineer to play a key role in its next stage of growth. This is an opportunity to work on mission-critical, real-time systems used at scale, with genuine ownership across architecture, development, and delivery. The role is hands-on, commercially focused, and suited ...

Senior Software Engineer The Opportunity On behalf of a global powerhouse in FinTech Infrastructure , we are seeking a Senior Software Engineer . Our client operates one of the largest financial networks, serving as the digital backbone for thousands of global financial institutions. This … senior-tier appointment for an engineer who excels at building resilient, high-concurrency systems and wants to lead the digitalization of global financial markets. The Technical Stack You will be working within a modern, engineering-first culture. The core stack includes: The Engine: Expert-level C# and .NET ...

Senior Software Engineer - SaaS/AI scale up £80-£90,000+ benefits and remote working A Senior Software/Principal Software Engineer opportunity for an exciting tech business offering innovative products to a global customer base. This is a senior hands … engineer position in a Ruby, Rails, React, AWS stack leading projects in a scale up environment. The business is developing a genuinely exciting product and are growing; they promote autonomy and collaboration and support remote working. Previous experience in a full stack engineer role using Ruby, TypeScript, React ...

Senior Software Engineer | £800 per day (Inside IR35) | London | 3 days in Office Industry: Commodities Trading Location: London Job Type: Contract (6 months initial) Our client, a leading commodities trading firm, is seeking a Senior Software Engineer to support Front Office Technology across … Power. This is a senior, delivery-focused role suited to an engineer who can take ownership of initiatives and drive them end-to-end within a fast-paced trading environment. You will work closely with Front Office stakeholders and technology teams, delivering robust platforms and tooling that directly ...

Senior Software Engineer | London | £100,000 - £160,000 | Python | FastAPI | AWS Location: London based - hybrid Salary: £100,000 - £160,000 + equity Tech Stack: Backend: Python (experience with FastAPI or Django or Flask beneficial) Cursor, Claude Code AWS - experience with Azure & GCP beneficial Are you a backend … engineer who cares more about building robust systems and being part of a well-funded, fast moving start-up? We are working with a recently funded Series A technology company building AI powered automation for real world, critical workflows. Their platform captures operational knowledge and turns it into production ...

Senior Software Engineer (Robotics) 🤖 London (On-site, 5 days/week) Permanent role with excellent on-site benefits We’re looking for a Senior Software Engineer to help turn our advanced robotics stack into a dependable, real-world product. This is a hands … write production code, integrate subsystems, and work directly with robots in both simulation and hardware environments 🤖. You’ll build application-level software that connects control, navigation, perception, learning, and platform systems —ensuring they operate as a seamless, reliable whole. Expect cross-disciplinary collaboration, rapid iteration, and solving practical ...

Senior Software Engineer Salary: £75k-£110k (plus attractive bonus on top) Location: London or Leeds (relaxed about hybrid or remote working, if preferred) My client is a specialist provider of sports pricing and trading technology, developing advanced simulation-based models and risk tools that underpin the performance … major sports brands. Role Overview Were looking for a Senior Software Engineer to join the Modelling & Data Engineering group at a rapidly expanding sports-technology business. This is a hands-on role in a fast-moving environment where youll help shape new modelling tools, improve existing systems ...

Senior Software Engineer (Tech Agnostic- Python, Go, Rust) Hybrid- London £100,000-£135,000 + Generous Equity + Strong Package Series A | High-Growth Tech We're partnered with one of Europe's fastest-scaling technology startups, fresh off a major Series A raise and building … More than half in Engineering, Product and Data Culture built around experimentation, high standards and rapid feedback loops You'll work closely with senior engineering leadership who have previously scaled large distributed systems and ML-driven platforms at global technology companies. Tech Environment Backend systems currently built in Python ...

Senior Software Engineer (JavaScript) Salary: Up to £85,000 Hybrid - 2 days a week in office (London/Brighton/Cardiff) Why join us? We work at the intersection of creativity, data, and cutting-edge technology to turn ideas into measurable impact. Our strength comes from diverse … puts people first. Backed by a global media and content network, we build tools that reach real audiences at scale. The role As a Senior Software Engineer, you'll design and build high-impact tools, automation, and platforms used across global media, SEO, paid media, and content ...

Senior Software Engineer 📍 London (Hybrid – South West London) 💰 £65,000–£90,000 + Equity Build the Future of Property Tech Residential property management is still run on spreadsheets and fragmented processes. We’re a seed-stage startup bringing intelligence, automation, and AI-driven optimisation to appliance procurement … lifecycle management at scale. We’ve proven early product–market fit and are now scaling. We’re hiring a Senior Software Engineer who wants real ownership and a clear path into technical leadership, with genuine progression to Head of Technology. What You’ll Do Design and ship ...