At a Glance
- Tasks: Design and build scalable backend systems for AI-driven products.
- Company: Join a fast-growing UK startup redefining talent connection with AI.
- Benefits: Competitive salary, equity, healthcare, gym membership, and flexible working.
- Other info: Opportunity to learn from experienced professionals and grow your career.
- Why this job: Be part of an ambitious team making a real impact in tech.
- Qualifications: Strong Python backend experience and a passion for clean code.
The predicted salary is between 80000 - 150000 £ per year.
About Dex
Dex is an AI-powered recruiter, matching exceptional software engineers with top tech companies. We are one of the fastest-growing UK startups, and have raised $3.1M from a16z and Concept Ventures to build a best-in-class voice agent, matching engine and web app experience that will redefine the way that talent and opportunity connect.
We are hiring a backend engineer to join our team, building both our product and AI agent systems to truly understand our users and connect them with the best opportunities.
About The Role
As a Software Engineer at Dex, you will be a key owner of the backend systems that drive our agentic voice agent and other agents in our web application. You will work with a modern Python stack - FastAPI, Postgres, Redis, Docker, and Pydantic AI, all running on GCP. Your focus will be split across the following areas, though you can lean into some more heavily than others depending on your interests and strengths:
- Product backend: Owning key areas of our backend infrastructure - making sure new additions to product are robust, secure and scalable from day one.
- Agent backend: Building and improving the infrastructure that powers our voice agent. This includes running evaluations, improving systematic information extraction, and ensuring our agentic systems run reliably at scale.
- Observability: Ensuring visibility into our production systems through monitoring, logging, and performance tracking.
- Matchmaking: Building and optimising the data and systems that power our AI-driven talent matching engine.
In this role you will:
- Design and build scalable backend infrastructure for AI agent workflows and product systems.
- Own the reliability and performance of systems that power our voice agent and web application.
- Work with the team to define technical strategy, architecture, and long-term goals.
- Build and maintain robust APIs, authentication systems, and database architecture.
- Collaborate with product, design, and other engineers to build infrastructure that meets evolving needs.
- Contribute to the development of best practices around system reliability, performance, and delivery velocity.
You might thrive in this role if you:
- Are genuinely excited about what we are building.
- Can demonstrate strong backend experience in Python, and solid CS fundamentals.
- Have already built products that feature significant LLM usage.
- Take pride in writing clean, maintainable code.
- Are outcome-oriented and proactively take ownership of areas of the codebase.
- Excel at systematically breaking down complex problems and weighing up solutions pragmatically.
Note: We know that talent can’t be summed up in a few bullet points. Even if you don’t match all the criteria we’ve mentioned, we don’t want that to be a barrier. If you’re excited about what we’re building, we want to hear from you.
What we offer
Joining Dex means being part of a fast-moving, ambitious team building something meaningful. In addition, we offer:
- £80,000 to £150,000
- Meaningful equity
- Full healthcare for you and your loved ones
- Exceptional Wellbeing, health and learning support
- Flexible working with minimum 3 days a week in our office near London Bridge
- Brand-new Macbook Pro
- Gym membership
- An opportunity to work with and learn from an experienced team, and grow with the business.
Senior Software Engineer in London employer: Dex
At Dex, we pride ourselves on being a dynamic and innovative employer that empowers our team members to thrive in a fast-paced environment. With competitive salaries, meaningful equity, and comprehensive healthcare benefits, we prioritise the well-being and professional growth of our employees. Our collaborative culture fosters creativity and learning, making it an exciting place for software engineers to contribute to groundbreaking AI technology while enjoying flexible working arrangements near London Bridge.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Software 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 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 Senior Software 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 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.
