At a Glance
- Tasks: Architect and build a groundbreaking legal AI platform from scratch.
- Company: Stealth startup transforming legal services with innovative technology.
- Benefits: Competitive salary up to £250k, equity options, and flexible working arrangements.
- Other info: Dynamic startup culture with opportunities for rapid career growth.
- Why this job: Join a pioneering team and revolutionise the legal industry with cutting-edge AI solutions.
- Qualifications: Proven experience in software engineering and building AI-native systems.
The predicted salary is between 78750 - 96250 £ per year.
This role is with one of Dex's trusted partner companies.
We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process.
The role Billions have flowed into legal AI, yet the actual service companies receive has barely changed: software is sold to law firms, and the efficiency gains stay with the partners.
This stealth startup flips the model by delivering the legal service directly.
Their agentic system plugs straight into client workspaces like Slack, Notion, and email to detect legal needs, triage context, and draft roughly 90% of the work, while an in-house team of top-tier lawyers handles the remaining judgement, sign-off, and regulatory liability.
Backed by a significant pre‑seed round from top‑tier early‑stage investors, they launch with paying design partners from day one.
The work Architect and build the core agentic platform from scratch, establishing the engineering foundations with zero legacy code.
Build deep, reliable integrations into client workspaces including Slack, email, Notion, and CRMs to capture legal context and drive proactive workflows.
Design the human‑in‑the‑loop interfaces and state machines that allow in‑house lawyers to rapidly review, verify, and sign off on high‑stakes automated outputs.
Partner directly with paying launch customers and internal legal partners to identify friction points and decide what to automate first.
Establish the engineering culture, interview and hire the next founding engineers, and maintain a high bar for speed and code quality.
What You Bring Staff‑level engineering capability with a proven track record of taking software products from zero to one inside fast‑moving, venture‑backed startups.
Demonstrated experience building and shipping AI‑native or agentic systems in production, ideally involving deep integrations into platforms like Slack, Notion, email, or CRMs.
High‑judgement product sense: you can deconstruct ambiguous problems into tight MVPs, make foundational architectural decisions, and ship fast without over‑engineering.
Experience setting technical direction and hiring or mentoring other engineers, paired with a clear desire to stay hands‑on writing code.
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Founding Software Engineer (Senior/Staff) employer: Dex
At Dex, we pride ourselves on being an exceptional employer, offering a dynamic work culture that fosters innovation and collaboration. Our London-based team enjoys a hybrid working model, competitive benefits, and ample opportunities for professional growth, all while contributing to cutting-edge technology in the healthcare sector. Join us to make a meaningful impact in real-time systems and edge deployment, surrounded by a supportive team dedicated to excellence.
StudySmarter Expert Advice🤫
We think this is how you could land Founding Software Engineer (Senior/Staff)
✨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 Founding Software Engineer (Senior/Staff)
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.
