At a Glance
- Tasks: Build innovative software features from concept to production in a dynamic startup environment.
- Company: Join one of London's fastest-growing AI-first startups with a collaborative culture.
- Benefits: Competitive salary, equity, hybrid work, and opportunities for professional growth.
- Other info: Work closely with founders and a small, high-performing team in an exciting growth phase.
- Why this job: Make a real impact on AI adoption in enterprises while shaping the product and engineering standards.
- Qualifications: Strong experience in full stack development and a passion for startup culture.
The predicted salary is between 90000 - 110000 £ per year.
We're partnered with one of London's fastest-growing AI-first startups, looking to hire multiple Senior Full Stack Engineers as they continue to scale. They're solving one of the biggest challenges facing enterprise organisations today: helping thousands of employees actually adopt AI tools and generate measurable business value from them. The platform is already used by major enterprise organisations, has surpassed £1m ARR, and is entering its next phase of growth.
This is a true end-to-end product engineering position. You'll own features from discovery through to production, working closely with Product and Design rather than simply delivering tickets. Engineers are trusted to shape solutions, influence technical direction and make pragmatic architectural decisions across the entire stack. You'll be joining a team that's heavily AI-enabled in the way they build software. AI coding assistants and agentic development workflows are embedded into day-to-day engineering, so you'll be expected to be comfortable using tools such as Claude, Cursor, GitHub Copilot or similar to improve your own productivity.
What You'll Be Doing
- Building customer-facing product features across frontend and backend.
- Owning projects from idea through to production.
- Working directly with Product and Design to solve real customer problems.
- Driving technical standards, code quality and engineering best practice.
- Making architectural decisions across APIs, backend services, frontend applications and data models.
- Helping scale a high-growth SaaS platform used by thousands of users.
- Contributing to a collaborative engineering culture where everyone owns outcomes, not just tickets.
Tech Stack
- Backend: Python (FastAPI preferred, Django or Flask also welcomed)
- Frontend: Vue.js, React, Next.js, Angular, TypeScript
Experience with the exact stack isn't essential - they're looking for engineers who understand modern product engineering rather than framework specialists.
What They're Looking For
- Strong experience as a Senior Full Stack Engineer building production SaaS products.
- The ability to comfortably own work across frontend and backend.
- Experience delivering customer-facing products from concept through to production.
- Strong product instincts and experience working closely with Product Managers, Designers or end users.
- Confidence making technical decisions and setting engineering standards.
- Excellent communication skills - you'll regularly collaborate across engineering, product and leadership.
- Daily experience using AI tooling within your own engineering workflow.
- A genuine desire to work in a startup environment and help build a business, rather than simply joining another engineering team.
- Previous startup experience isn't essential, but enthusiasm for startup life absolutely is.
Why Join?
- Join at an exciting stage of growth with £1m ARR already achieved.
- Help shape the engineering culture as one of several senior hires.
- Small, high-performing engineering team with real ownership.
- Work directly with founders and senior leadership.
- AI-first engineering culture using modern developer tooling.
- Significant influence over architecture, product direction and technical standards.
- Competitive salary (£90-110k sweet spot) plus equity.
Hybrid Working
The engineering team collaborates in the London office every Tuesday. Every seven weeks the whole company comes together for a four-day "Anchor Week" focused on planning, collaboration and team building.
Interview Process
- Introductory conversation (with the option to speak directly with the Engineering leadership team for exceptional candidates).
- Short application including three written questions.
- Practical take-home engineering exercise.
- Technical interview discussing your solution and engineering approach.
- Final onsite interview with the wider team.
If you're an experienced product engineer who enjoys owning problems end-to-end, embraces modern AI-assisted software development and wants to help build a category-defining startup, we'd love to hear from you.
Senior Full Stack Engineer in London employer: SR2 | Socially Responsible Recruitment | Certified B Corporation™
Join one of London's fastest-growing AI-first startups, where you'll have the opportunity to make a significant impact as a Senior Full Stack Engineer. With a collaborative and innovative work culture, you'll enjoy hybrid working arrangements, competitive salaries, and equity options, all while being part of a small, high-performing team that values your input in shaping the product and technical direction. This is a unique chance to grow alongside a company that's already achieved £1m ARR and is poised for further expansion.
Contact Details:
SR2 | Socially Responsible Recruitment | Certified B Corporation™ Recruitment Team
StudySmarter Expert Advice🤫
We think this is how you could land Senior Full Stack Engineer in London
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at SR2 | Socially Responsible Recruitment | Certified B Corporation™ or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to SR2 | Socially Responsible Recruitment | Certified B Corporation™.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like SR2 | Socially Responsible Recruitment | Certified B Corporation™.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like SR2 | Socially Responsible Recruitment | Certified B Corporation™ that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Senior Full Stack Engineer in London
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at SR2 | Socially Responsible Recruitment | Certified B Corporation™.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at SR2 | Socially Responsible Recruitment | Certified B Corporation™ and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at SR2 | Socially Responsible Recruitment | Certified B Corporation™
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If SR2 | Socially Responsible Recruitment | Certified B Corporation™ uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
