1 to 25 of 26 Senior Full-Stack Engineer Jobs in the City of London

Senior Full-Stack Engineer London AI Start-up Up to £120,000 + Shares + Private Healthcare + Pension Were working with a well-funded AI start-up in London thats gearing up for huge growth. Theyre expecting to scale 10x over the next 18 months. Theyre now looking for a Senior Full-Stack Engineer to help design and build the next generation of their AI-driven platform. Reporting directly into the CTO and collaborating closely with product and research teams, this is a unique chance to take ownership across the stack and make a lasting impact in a company at the … big plus. The role is full-time, 3/4 days a week in their London office. What theyre looking for Strong experience as a Full-Stack Engineer across React, Next.js, Node.js, and Python. Solid knowledge of SQL databases and data modelling. Hands-on experience with cloud platforms (AWS or GCP). More ❯

Senior Full-Stack Engineer London AI Start-up Up to £120,000 + Shares + Private Healthcare + Pension Were working with a well-funded AI start-up in London thats gearing up for huge growth. Theyre expecting to scale 10x over the next 18 months. Theyre now looking for a Senior Full-Stack Engineer to help design and build the next generation of their AI-driven platform click apply for full job details More ❯

Senior Full-Stack Engineer London AI Start-up Up to £120,000 + Shares + Private Healthcare + Pension Were working with a well-funded AI start-up in London thats gearing up for huge growth. Theyre expecting to scale 10x over the next 18 months. Theyre now looking for a Senior Full-Stack Engineer to help design and build the next generation of their AI-driven platform. Reporting directly into the CTO a... More ❯

About the Job Senior Fullstack Engineer (React/.Net) – London (Victoria) | Hybrid £80k - £110k Are you ready to craft the next generation of data-driven digital experiences for one of Europe’s most technically advanced SaaS innovators? Our client, a pioneer in B2B SaaS solutions , is … building “Your Shipping Analytics Supercomputer” , providing cutting-edge data visualisation and dynamic dashboards for high-velocity business & artificial intelligence. About the Role As a Senior Full-stack Engineer , you’ll play a key role in architecting and developing scalable, high-performance web applications that bring complex data to life. Working across both … This is an outstanding opportunity to design and deliver the front-end of a platform that’s redefining how businesses interact with data. If you’re a passionate engineer who loves solving complex problems through clean, intelligent design — let’s connect More ❯

About the Job Senior Fullstack Engineer (React/.Net) – London (Victoria) | Hybrid £80k - £110k Are you ready to craft the next generation of data-driven digital experiences for one of Europe’s most technically advanced SaaS innovators? Our client, a pioneer in B2B SaaS solutions , is … building “Your Shipping Analytics Supercomputer” , providing cutting-edge data visualisation and dynamic dashboards for high-velocity business & artificial intelligence. About the Role As a Senior Full-stack Engineer , you’ll play a key role in architecting and developing scalable, high-performance web applications that bring complex data to life. Working across both … This is an outstanding opportunity to design and deliver the front-end of a platform that’s redefining how businesses interact with data. If you’re a passionate engineer who loves solving complex problems through clean, intelligent design — let’s connect More ❯

research, and data science. Our squads focus on delivering high-impact features – we favour a highly iterative, analytical approach. We're looking for a Senior Full-stack Engineer to join our Development team. Principal Accountabilities: • Build robust and scalable software for business critical, web-based applications • Build eye-catching, functional, efficient, and … for one or more of Ki’s core technologies • Mentor and coach colleagues in both engineering and business domain subjects Required Skills and Experience: • Experience as a mid-senior level engineer working across a modern web stack • Strong software engineering principles (SOLID, DRY, ER modelling) • Professional experience with a server-side language, ideally JVM More ❯

research, and data science. Our squads focus on delivering high-impact features – we favour a highly iterative, analytical approach. We're looking for a Senior Full-stack Engineer to join our Development team. Principal Accountabilities: • Build robust and scalable software for business critical, web-based applications • Build eye-catching, functional, efficient, and … for one or more of Ki’s core technologies • Mentor and coach colleagues in both engineering and business domain subjects Required Skills and Experience: • Experience as a mid-senior level engineer working across a modern web stack • Strong software engineering principles (SOLID, DRY, ER modelling) • Professional experience with a server-side language, ideally JVM More ❯

At a Glance Capsa is an AI platform that accelerates due diligence and deepens insights for Private Equity funds. We are hiring senior software engineers who are comfortable contributing across all layers of the application and developing features end to end. Details: Role : Senior Software Engineer - Full Stack Location : London … companies like QinetiQ and retail tech startups such as Standard AI. The entire team consists of early-stage startup veterans passionate about building exceptional products. The Role A senior software engineer at Capsa is expected to own projects and features from conception to production, working across the stack to deliver improvements to our AI … will have a direct impact on its success. Have the opportunity for fast career growth. Enjoy yourself! Apply if: You have 4+ years of experience as a software engineer in a venture backed startup or top tech firm. You have taken entire products or features from ideation to production and you've measured their impact. You have experience More ❯

At a Glance Capsa is an AI platform that accelerates due diligence and deepens insights for Private Equity funds. We are hiring senior software engineers who are comfortable contributing across all layers of the application and developing features end to end. Details: Role : Senior Software Engineer - Full Stack Location : London … companies like QinetiQ and retail tech startups such as Standard AI. The entire team consists of early-stage startup veterans passionate about building exceptional products. The Role A senior software engineer at Capsa is expected to own projects and features from conception to production, working across the stack to deliver improvements to our AI … will have a direct impact on its success. Have the opportunity for fast career growth. Enjoy yourself! Apply if: You have 4+ years of experience as a software engineer in a venture backed startup or top tech firm. You have taken entire products or features from ideation to production and you've measured their impact. You have experience More ❯

Senior Full Stack Engineer (Backend-leaning) - eCommerce London/Hybrid – 1 day per week in-office Up to £90k DOE + Share Options + MacBook Pro + £600 Wellbeing Allowance 🚫 Visa sponsorship is NOT available Join a VC-backed, fast-growing Series A startup redefining how customers shop for luxury fashion online. … systems , not just frontend themes MacBook Pro + £600 wellbeing budget + generous share options Work where fashion, fintech, and engineering meet If you're a strong full-stack engineer with backend leanings and a passion for building serious products in Shopify , this is a rare opportunity to join a high-growth team on More ❯

Senior Full Stack Engineer (Backend-leaning) - eCommerce London/Hybrid – 1 day per week in-office Up to £90k DOE + Share Options + MacBook Pro + £600 Wellbeing Allowance 🚫 Visa sponsorship is NOT available Join a VC-backed, fast-growing Series A startup redefining how customers shop for luxury fashion online. … systems , not just frontend themes MacBook Pro + £600 wellbeing budget + generous share options Work where fashion, fintech, and engineering meet If you're a strong full-stack engineer with backend leanings and a passion for building serious products in Shopify , this is a rare opportunity to join a high-growth team on More ❯

Ocean Orchestra - Senior Full Stack Engineer At a glance : 💰 £75–95K + equity 🌍 Climate tech with global impact 🛠 Early engineer, greenfield build 🏠 Remote-first UK + London office a few days 🎯 Autonomy, ownership, and direct impact About the Company Founded in January 2025, Ocean Orchestra aims to be a generational More ❯

Ocean Orchestra - Senior Full Stack Engineer At a glance : 💰 £75–95K + equity 🌍 Climate tech with global impact 🛠 Early engineer, greenfield build 🏠 Remote-first UK + London office a few days 🎯 Autonomy, ownership, and direct impact About the Company Founded in January 2025, Ocean Orchestra aims to be a generational More ❯

which you can use to make soime weeks 2 days a week from home. Please also note - sponsorship is not an option here unfortunately. The role As a Senior Software Engineer, you will: Understand complex business problems then propose and implement technical solutions Have input into the architecture, working closely with the Head of Technology and … other senior team members Work with other engineers and the business to improve user experiences Bring your experience and enthusiasm to our engineering culture Promote excellence with technical mentoring, feedback, and code reviews Participate in planning sessions, retrospectives, stand-ups and demos Join us in curating a codebase to be proud of, driving for quality, maintainability and testability More ❯

which you can use to make soime weeks 2 days a week from home. Please also note - sponsorship is not an option here unfortunately. The role As a Senior Software Engineer, you will: Understand complex business problems then propose and implement technical solutions Have input into the architecture, working closely with the Head of Technology and … other senior team members Work with other engineers and the business to improve user experiences Bring your experience and enthusiasm to our engineering culture Promote excellence with technical mentoring, feedback, and code reviews Participate in planning sessions, retrospectives, stand-ups and demos Join us in curating a codebase to be proud of, driving for quality, maintainability and testability More ❯

our success. Our engineers transform raw data into actionable insights that help brands integrate seamlessly into virtual environments and engage effectively with digital audiences. Your Focus As a Senior Fullstack Engineer, you will be pivotal in both frontend and backend development, crafting responsive, scalable web applications. This role requires strong expertise across the stack … principles to backend integrations. You will design and implement APIs using JavaScript, TypeScript, and React, ensuring seamless performance and scalability. We’re looking for a proactive and experienced engineer who thrives in a scaling organisation and enjoys leading complex projects from conception to delivery. You’ll be both a technical leader and a driver of innovation across the More ❯

our success. Our engineers transform raw data into actionable insights that help brands integrate seamlessly into virtual environments and engage effectively with digital audiences. Your Focus As a Senior Fullstack Engineer, you will be pivotal in both frontend and backend development, crafting responsive, scalable web applications. This role requires strong expertise across the stack … principles to backend integrations. You will design and implement APIs using JavaScript, TypeScript, and React, ensuring seamless performance and scalability. We’re looking for a proactive and experienced engineer who thrives in a scaling organisation and enjoys leading complex projects from conception to delivery. You’ll be both a technical leader and a driver of innovation across the More ❯

Senior Full Stack Engineer – AI Startup – Up to 150k 🚀🧠 💰 Salary: £80,000 - £150,000 + meaningful equity 🏙️ Location : London, flexible working arrangements, ideally 1/2 days in office 💻 Tech Stack : Python, Flask, FastAPI, React, TypeScript, GCP (Backend Leaning) 📈 Team size: 27 heads Our y-combinator backend client are building … Understand the working dynamics of a fast paced start-up If this role sounds like it could be of interest, apply now! Senior Full Stack Engineer – AI Startup – Up to 150k More ❯

Senior Full Stack Engineer (Backend-leaning) - High-Growth eCommerce Platform London/Hybrid (1 day per week) · c £80,000 + Share Options · VC-backed Series A Startup 🚫 This company is unable to offer visa sponsorship at this time Shape the Architecture of a High-Growth eCommerce Platform We’re working with … eCommerce space that is scaling fast and working with some of the most recognisable fashion brands globally. They’re looking for a Senior Full Stack Engineer (backend-leaning) to take ownership of architecture, data flows, and complex integrations powering a platform used by millions. This isn’t about tweaking themes, it’s … engineers who want to shape tech foundations pre-scale. Interview Process 30-min culture & tech fit conversation 60–90 min technical scenario interview (no whiteboarding) Offer Ideal for senior full stack or backend engineers with TypeScript/React/AWS experience who want to shape architecture at a growing, product-led company. More ❯

Senior Full Stack Engineer (Backend-leaning) - High-Growth eCommerce Platform London/Hybrid (1 day per week) · c £80,000 + Share Options · VC-backed Series A Startup 🚫 This company is unable to offer visa sponsorship at this time Shape the Architecture of a High-Growth eCommerce Platform We’re working with … eCommerce space that is scaling fast and working with some of the most recognisable fashion brands globally. They’re looking for a Senior Full Stack Engineer (backend-leaning) to take ownership of architecture, data flows, and complex integrations powering a platform used by millions. This isn’t about tweaking themes, it’s … engineers who want to shape tech foundations pre-scale. Interview Process 30-min culture & tech fit conversation 60–90 min technical scenario interview (no whiteboarding) Offer Ideal for senior full stack or backend engineers with TypeScript/React/AWS experience who want to shape architecture at a growing, product-led company. More ❯

the world by the end of 2025. Join us and be part of a team that’s revolutionizing how entrepreneurship is taught and practiced! The Role As a Senior Fullstack Engineer at Oneday, you will play a pivotal role in building a performant, reliable, and elegant product experience across our platform – both frontend and backend. Our More ❯

early-stage B2B SaaS company that’s building something genuinely transformative in their category. As they enter a critical phase of growth, they’re looking to hire a Senior or Principal Full-Stack Software Engineer to help lay the technical foundations of their platform and influence both the engineering direction and long … term product strategy. This is a high-impact role offering direct collaboration with cross-functional teams, including senior leadership and the CEO. The successful candidate will play a key part in shaping architecture, scaling infrastructure, and delivering features that add real value to users. Key Responsibilities: Design and implement scalable, secure, and high-performance systems. Own and evolve … reviews and debugging. Bring new ideas and best practices to continuously elevate engineering standards. Ideal Experience: 5+ years of experience working with JavaScript/TypeScript as a full-stack engineer. Experience leading projects or teams in a technical capacity. Previous exposure to early-stage startups, ideally in B2B SaaS. Strong proficiency in modern front-end frameworks More ❯

early-stage B2B SaaS company that’s building something genuinely transformative in their category. As they enter a critical phase of growth, they’re looking to hire a Senior or Principal Full-Stack Software Engineer to help lay the technical foundations of their platform and influence both the engineering direction and long … term product strategy. This is a high-impact role offering direct collaboration with cross-functional teams, including senior leadership and the CEO. The successful candidate will play a key part in shaping architecture, scaling infrastructure, and delivering features that add real value to users. Key Responsibilities: Design and implement scalable, secure, and high-performance systems. Own and evolve … reviews and debugging. Bring new ideas and best practices to continuously elevate engineering standards. Ideal Experience: 5+ years of experience working with JavaScript/TypeScript as a full-stack engineer. Experience leading projects or teams in a technical capacity. Previous exposure to early-stage startups, ideally in B2B SaaS. Strong proficiency in modern front-end frameworks More ❯

Full Stack Product Engineer – SaaS Startup 🚨 We’re excited to partner with a profitable SaaS startup experiencing rapid growth and strong ARR in a short timeframe. Due to increasing customer demand, they’re expanding their engineering team and looking for product-minded engineers to join them on their journey. 💼 Role Details Title: Senior Product Engineer Location: Hybrid – 3 days/week in Central London office Salary: Up to £120k + Equity Tech Stack: Go, TypeScript, React (open to other strong technical backgrounds) ✅ What They’re Looking For Engineers who think like product owners Prior startup success or fast-paced environment experience A background in top-tier education … growth, product-led team Build features that directly impact customer success Work with a smart, driven team and cutting-edge tech 🚨 Full Stack Product Engineer – SaaS Startup More ❯

full ownership — from design to deployment — in a fast-paced, agile environment that values clean code and stunning user experiences. 🛠️ What You’ll Do Build full-stack features (frontend to backend) Collaborate on features & improvements Integrate APIs, mentor peers & create pixel-perfect UI 🎯 What We’re Looking For 4+ yrs in frontend (React or More ❯