SeniorFull-StackEngineer 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 SeniorFull-StackEngineer 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 … is a big plus. The role is full-time, 5 days a week in their London office. What theyre looking for Strong experience as a Full-StackEngineer 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 ❯
City of London, London, United Kingdom Hybrid / WFH Options
SR2 | Socially Responsible Recruitment | Certified B Corporation™
SeniorFullStackEngineer £65,000 – £75,000 + benefits | London | Hybrid We’re working with a fast-growing, purpose-driven tech company in the climate space. Their products are used by leading global banks, insurers, and asset managers to understand and manage physical climate risk. As a SeniorFullStackEngineer , you’ll work across backend and frontend systems to build high-performance tools and integrations. You’ll collaborate closely with data science and engineering teams to deliver reliable APIs, intuitive UIs, and seamless workflows that enable clients to analyse large, complex datasets. What you’ll do: Build and maintain APIs, services, and More ❯
london (city of london), south east england, united kingdom Hybrid / WFH Options
SR2 | Socially Responsible Recruitment | Certified B Corporation™
SeniorFullStackEngineer £65,000 – £75,000 + benefits | London | Hybrid We’re working with a fast-growing, purpose-driven tech company in the climate space. Their products are used by leading global banks, insurers, and asset managers to understand and manage physical climate risk. As a SeniorFullStackEngineer , you’ll work across backend and frontend systems to build high-performance tools and integrations. You’ll collaborate closely with data science and engineering teams to deliver reliable APIs, intuitive UIs, and seamless workflows that enable clients to analyse large, complex datasets. What you’ll do: Build and maintain APIs, services, and 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 SeniorFull-stackEngineer 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 ❯
london (city of london), south east england, united kingdom
Ki
research, and data science. Our squads focus on delivering high-impact features – we favour a highly iterative, analytical approach. We're looking for a SeniorFull-stackEngineer 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 ❯
City of London, London, United Kingdom Hybrid / WFH Options
Capsa AI
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 - FullStack 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 5+ 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 ❯
london (city of london), south east england, united kingdom Hybrid / WFH Options
Capsa AI
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 - FullStack 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 5+ 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/Founding Engineer £80 000 - £100 000 ( 4 days a week) The Challenge Imagine being part of the engineering team that builds the go-to product that makes sense of the real economics behind AI agents. The challenge is not small: nothing is mapped, costs shift by the second, and lots of start-ups, if More ❯
london (city of london), south east england, united kingdom
SEEKR
Senior/Founding Engineer £80 000 - £100 000 ( 4 days a week) The Challenge Imagine being part of the engineering team that builds the go-to product that makes sense of the real economics behind AI agents. The challenge is not small: nothing is mapped, costs shift by the second, and lots of start-ups, if More ❯
City of London, London, United Kingdom Hybrid / WFH Options
Ocean Orchestra
Ocean Orchestra - SeniorFullStackEngineer 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 ❯
london (city of london), south east england, united kingdom Hybrid / WFH Options
Ocean Orchestra
Ocean Orchestra - SeniorFullStackEngineer 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 ❯
SeniorFullStackEngineer – AI Startup – Up to 130k 🚀🧠 💰 Salary: £80,000 - £130,000 + meaningful equity 🏙️ Location : London, flexible working arrangements, ideally 1/2 days in office 💻 Tech Stack : Python, Flask, FastAPI, React, TypeScript, GCP (Backend Leaning) Our y-combinator backend client are building an elite engineering team … Understand the working dynamics of a fast paced start-up If this role sounds like it could be of interest, apply now! SeniorFullStackEngineer – AI Startup – Up to 130k More ❯
comprehensive cross-platform gaming analytics solution in the world. We’re thrilled about what’s next and we’re looking for a SeniorFullStackEngineer to help us build it. What This Role Looks Like As a SeniorFullStackEngineer on the More ❯
City of London, London, United Kingdom Hybrid / WFH Options
Oliver Bernard
FullStack 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 🚨 FullStack Product Engineer – SaaS Startup More ❯
architect, coordinate, and maintain our subsystems. We’re doing all of this against a backdrop of continuous innovation and refinement. The Role We are looking for a Fullstack Engineer (Go + React) to help scale and evolve the core Xapien platform as we grow rapidly. Working directly with our Head of Engineering , you will play a key role More ❯
london (city of london), south east england, united kingdom
Xapien
architect, coordinate, and maintain our subsystems. We’re doing all of this against a backdrop of continuous innovation and refinement. The Role We are looking for a Fullstack Engineer (Go + React) to help scale and evolve the core Xapien platform as we grow rapidly. Working directly with our Head of Engineering , you will play a key role More ❯
where human well-being is safeguarded while closing the gaps in critical global labour needs. We are now looking for a FullStack Software Engineer with a strong frontend focus to help design and build a modern, web-based platform for managing and monitoring our robots and systems. While we operate in the robotics More ❯
london (city of london), south east england, united kingdom
Humanoid
where human well-being is safeguarded while closing the gaps in critical global labour needs. We are now looking for a FullStack Software Engineer with a strong frontend focus to help design and build a modern, web-based platform for managing and monitoring our robots and systems. While we operate in the robotics More ❯
We’re looking for an experienced FullStackEngineer to help build and scale a modern product used by global businesses. You’ll be joining a small, highly collaborative team where you’ll have a direct impact on both the technology and the way the team works. The Role Take ownership of features end More ❯
london (city of london), south east england, united kingdom
Gravitas Recruitment Group (Global) Ltd
We’re looking for an experienced FullStackEngineer to help build and scale a modern product used by global businesses. You’ll be joining a small, highly collaborative team where you’ll have a direct impact on both the technology and the way the team works. The Role Take ownership of features end More ❯
