At Tessl, we’re reimagining software development for the AI era, and helping shape a new paradigm called AI Native Development.
At Tessl, we’re reimagining software development for the AI era, and helping shape a new paradigm called AI Native Development.
What they do: Spec-driven platform and registry for versioned, evaluated agent skills and context (AI-native development / agent enablement)
Founder / CEO: Guy Podjarny
HQ: London
Employees (approx.): 53
Notable funding: $125M reported (seed + Series A), led by Index Ventures
Making AI-driven, agentic software development reliable and maintainable through specs, skill evaluation, and registries.
Software Development
$125M
Report states $125M raised across a seed round and a Series A; participation named from Accel, GV, and Boldstart; post-money valuation reported north of $500M in coverage.
“Backed by Index Ventures, Accel, GV (Google Ventures) and Boldstart”
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Tessl is a fast-growing Series A startup based in London, founded by Guy Podjarny. We’ve raised over $100M from world-class investors including Index Ventures, Accel, GV, and Boldstart, and this year we were ranked #2 in Sifted EU’s B2B SaaS Rising 100 and #20 in Sifted's AI 100.
At Tessl, we believe AI is transforming software development. AI Native Developers will define features, architecture, and workflows in specs, not code, guiding the work of AI agents. We’re building the pioneering platform for this new paradigm and leading the developer movement and ecosystem around it.
Joining Tessl means becoming an early team member with the opportunity to shape the future of how software is created and maintained.
Overview of role
Join our engineering team to build real-time AI Native workflows, tooling, and interfaces that will reshape how developers create and maintain software.
As a Software Engineer, you’ll be versatile and independent, excited to work with cutting-edge AI tools to build great products. We move quickly, but with purpose - balancing speed with collaboration and thoughtful execution. You’ll collaborate closely with product, design, and the wider Engineering team to bring AI Native development to life in a fast-paced, high-trust environment.
What you’ll do
No two days will be the same at Tessl! You’ll have a high level of autonomy and be able to make decisions based on what you believe will help you deliver the most success. Here’s an insight into just a few of the things you would be doing:
What we’re looking for
Essential
Nice to have
Salary And Benefits Office: Our brand new 10,000 sq. ft office is in the AI hub of Kings Cross, London. We have generous catering and have regular social events such as team lunches, drinks and more. We require all staff to be in our London HQ at least 3 days a week on our anchor days of Monday, Tuesday and Thursday.
Salary : We offer a competitive salary based on experience and skills, benchmarked against industry standards.
Benefits : 25 days holiday, health insurance, including dental and vision, which extends to partners and dependents, as well as a company-matched pension. We also provide a commuting stipend for those who live outside London, and a cycle to work scheme.
Application Process
Here’s an outline of what you can expect during our interview process:
A relaxed chat to learn about your background, interests, and career goals. We’ll also share more about the role, Tessl’s vision, and answer any questions you have.
You’ll receive a practical challenge based on real scenarios you might tackle at Tessl: an opportunity to showcase your approach to problem-solving on your own schedule.
You’ll pair with two of our lead engineers to build on your take-home exercise. This session simulates working together on real problems and allows us to explore your technical expertise more deeply.
A two-way dialogue about our values, team dynamic, and your motivations. Feel free to ask about life at Tessl, growth opportunities, or anything else you’re curious about.
Our final stage focuses on strategic alignment and long-term vision. You’ll learn more about Tessl’s roadmap and learn more about how you could contribute to our mission.
Throughout the process, if you have any specific requirements or need adjustments, please let us know: we’re happy to accommodate. We care deeply about the warm, inclusive environment we’re building at Tessl and we value diversity – we welcome applications from those typically underrepresented in tech. If you like the sound of this role but are not totally sure whether you’re the right person, do apply anyway!
Learn how we think and work