1 to 25 of 35 Permanent Senior Full-Stack Engineer Jobs in the South East

Senior Full-Stack Product Engineer Remote Working Up to £110,000 + Benefits Are you a passionate full-stack engineer who thrives in building end-to-end features that users love? We're partnering with a fast-growing, fully remote tech company on a mission to … empower product teams to deliver world-class user experiences - and they're looking for a Senior Full-Stack Product Engineer to join their ambitious team. Why this role? Join a remote-first company where flexibility is at the heart of how they work. Be part of a close-knit engineering team … and company-wide process improvements. Exploring new ideas with dedicated 10% time and monthly AI Fridays . What we're looking for: 5+ years' experience as a software engineer, including JavaScript/React and backend development. Proven experience delivering features in agile, fast-paced environments (start-ups/scale-ups a plus). A strong eye for design More ❯

Senior Software Engineer/Developer (Full Stack JavaScript) London to £100k Opportunity to progress your career in a senior, hands-on Software Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes … years, with recent funding of £125 million. You'll be working on complex and interesting systems and can enjoy a range of benefits and perks. As a Senior Software Engineer you'll collaborate as part of an Agile technology team to design and develop, troubleshoot and solve complex software issues to help scale and future proof … happy to mentor more junior developers You're likely to be degree educated in Computer Science or similar tech discipline What's in it for you: As a Senior Software Engineer you will receive a competitive package: Salary to £100k 25 days holiday (increasing to 30), plus Christmas Eve Vitality healthcare plus a host of wellbeing More ❯

We are looking for a Senior/Principal Full-Stack Software Engineer to join our growing team at Clearly. This is a high-impact role where you will shape the technical foundation of our platform, influence product direction, and help us scale as a company. You’ll work closely with a cross … of industry trends and bring best practice into the team. What you’ll need 5+ years of professional experience as a JavaScript/TypeScript engineer (full-stack). Experience in a leadership role is a plus. Proven experience working in an early-stage startup environment, ideally in B2B SaaS. You know how to thrive More ❯

We are looking for a Senior/Principal Full-Stack Software Engineer to join our growing team at Clearly. This is a high-impact role where you will shape the technical foundation of our platform, influence product direction, and help us scale as a company. You’ll work closely with a cross … of industry trends and bring best practice into the team. What you’ll need 5+ years of professional experience as a JavaScript/TypeScript engineer (full-stack). Experience in a leadership role is a plus. Proven experience working in an early-stage startup environment, ideally in B2B SaaS. You know how to thrive More ❯

Senior Full Stack Engineer £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 Senior Full Stack Engineer , 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 ❯

Senior Full Stack Engineer £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 Senior Full Stack Engineer , 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 ❯

Senior Full Stack Engineer £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 Senior Full Stack Engineer , 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 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 ❯

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 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 ❯

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 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 ❯

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 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 ❯

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 ❯

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 ❯

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 ❯

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 ❯

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 ❯

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 ❯

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 ❯

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 ❯

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 ❯