At a Glance
- Tasks: Design and build large-scale batch processing infrastructure and develop critical platform components.
- Company: Join a cutting-edge AI company transforming enterprise software with innovative solutions.
- Benefits: Competitive salary up to £200k, dynamic work environment, and opportunities for professional growth.
- Other info: Work in a talent-dense team in Central London, five days a week.
- Why this job: Make a real impact in a high-autonomy role with significant ownership from day one.
- Qualifications: 3+ years of backend engineering experience and expertise in distributed systems.
The predicted salary is between 180000 - 200000 £ per year.
The company is building an AI operating system for complex enterprise software environments. They use agentic AI to automate the analysis and documentation work that gates large-scale migrations and modernization efforts. It’s a hard problem: mapping programs, tables, and dependencies inside bespoke enterprise systems. Founded by experienced operators from top-tier tech companies, they’re already working with leading global enterprises and are backed by leading investors.
You’ll join a small, talent-dense backend team. This isn’t a ticket-taker role. You’ll own significant pieces of the core platform, from large-scale batch job infrastructure to the LLM gateway and enterprise-grade auth/observability. Expect high autonomy and real surface area from day one. The team operates with lean loops and a relentless quality bar. You’re here to solve problems end-to-end, not just implement specs.
The work:
- Design and build large-scale batch processing infrastructure, handling tens of millions of lines of customer code per tenant.
- Develop and optimize the LLM gateway, managing token throughput, provider failover, and quota across multiple models for real-time and async workloads.
- Own critical platform components like multi-tenant authentication, observability, and security, ensuring enterprise-grade reliability.
- Build internal tooling and APIs that measurably accelerate product development and maintain a high engineering velocity.
- Push the boundaries of the current stack (Kotlin, TypeScript, Azure, Terraform, Temporal, Postgres) to solve complex, evolving technical challenges.
What you bring:
- 3+ years of backend engineering experience, with significant platform or infrastructure ownership in a high-velocity startup environment.
- Proven ability to design and build distributed systems, including large-scale batch processing and queueing, owning problems end-to-end.
- Experience with LLM infrastructure at scale: token routing, provider failover, and managing real-time vs. async patterns.
- A track record of building internal tooling or APIs that demonstrably improved team efficiency, with a strong focus on reliability, observability, and multi-tenant security.
- Willingness to work in person with the team in Central London five days a week.
Software Engineer (Backend) (up to £200k) in London employer: Dex
At Dex, we pride ourselves on being an exceptional employer, offering a dynamic work environment in the heart of Central London. Our culture fosters innovation and collaboration, providing employees with high autonomy and the opportunity to tackle complex challenges from day one. With a focus on professional growth and a commitment to maintaining a lean, quality-driven team, we empower our engineers to take ownership of significant platform components while enjoying the benefits of working alongside experienced leaders in the tech industry.
StudySmarter Expert Advice🤫
We think this is how you could land Software Engineer (Backend) (up to £200k) 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 Dex 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 Dex.
✨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 Dex.
✨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 Dex 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 Software Engineer (Backend) (up to £200k) 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 Dex.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Dex 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 Dex
✨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 Dex 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.
