At a Glance
- Tasks: Design and build Kotlin/Micronaut microservices for payments and account management.
- Company: Join a dynamic engineering team with real autonomy and fast feedback.
- Benefits: Competitive salary, flexible work environment, and opportunities for professional growth.
- Other info: Collaborate with top banks and fintechs while using cutting-edge technology.
- Why this job: Own interesting problems and create impactful software in the fintech space.
- Qualifications: Experience in Kotlin/JVM and a passion for full stack development.
The predicted salary is between 60750 - 74250 £ per year.
Kotlin / JVM leaning, full stack and product-minded.
The role
We're looking for an engineer who wants ownership, a fast-moving environment and interesting problems to solve. If you enjoy Kotlin, distributed systems and designing services that have to be correct under concurrency, you'll find plenty to get stuck into. Your centre of gravity will be the backend, with the freedom to own the entire feature.
What you'll be working on
- Design and build Kotlin/Micronaut microservices handling lending, payments, receipts, billing and account management.
- Build asynchronous systems with Kafka and Avro, reason about concurrency and idempotency, and design resilient integrations that behave well under real production conditions.
- Work with Tier 1 banks, fintechs and specialist providers on payments, account infrastructure, financial data and transaction monitoring.
- Get into the engineering behind those integrations: authentication, signatures, certificates, key management, webhooks, network controls and recovery when a provider behaves unexpectedly.
- Work with LLMs, agents and MCP clients and servers.
- Design secure ways for AI systems to interact with financial capabilities, and connect financial data, lending rules and AI-driven decisioning to deterministic production services.
The problems are interesting
- A payment arrives twice.
- Two consumers race to make the same decision.
- A bank accepts an instruction but the callback arrives late.
- A workflow crosses several services and then fails halfway through.
You'll have the ownership to understand those problems and design solutions. You'll still work across the stack: build a Next.js/React workflow, expose an API, wire it into SWR and ship the UI in Tailwind/Catalyst. When the problem reaches Azure, Kubernetes or CI/CD, you'll be comfortable following it there.
How we work
We're a small engineering organisation with real autonomy and short feedback loops. Work directly with product, finance and commercial stakeholders. Take a problem, challenge assumptions, make technical decisions and get the solution into production. Use AI extensively, with clear engineering judgement and responsibility for the result.
What matters most
We'd rather find a strong Kotlin/JVM engineer who's curious, autonomous and capable of moving across the stack. Solid Java experience and an appetite for Kotlin are welcome.
You'd enjoy this role if...
- You like owning a problem and shipping useful software.
- You can move across services, UI, data and infrastructure.
- You use AI thoughtfully to increase what you can accomplish.
- You enjoy APIs, distributed systems and unfamiliar integrations.
- You care about production behaviour, including failure and recovery.
- You want tangible outcomes: businesses receiving funding, money moving and lending decisions becoming working products.
Bring your curiosity. Build things that matter.
Interview Process
- Introductory call – a video or phone call with our VP Engineering to get to know each other
- Technical interview – a coding challenge with a member of the engineering team
- Values and ways of working – a conversation with our Chief of Staff
- Founder call – a chat with our founder about Bourn’s vision and where we’re heading
- Offer – if it’s a match, we’ll make you an offer
Full Stack Engineer (Kotlin / JVM) in London employer: Bourn
Bourn offers a dynamic work environment where engineers can take ownership of end-to-end features across various domains such as lending, payments, and billing. The company emphasizes strong technical fundamentals in TypeScript and Kotlin, providing opportunities to work on innovative projects involving AI and fintech integrations. Employees can expect to engage with Tier 1 banks and fintechs, tackling interesting challenges in a fast-paced setting.
StudySmarter Expert Advice🤫
We think this is how you could land Full Stack Engineer (Kotlin / JVM) 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 Bourn 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 Bourn.
✨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 Bourn.
✨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 Bourn 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 Full Stack Engineer (Kotlin / JVM) 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 Bourn.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Bourn 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 Bourn
✨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 Bourn 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.
