
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
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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”
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 AI Engineering team to explore the boundaries of LLMs and AI, shaping Tessl's direction and transforming the developer experience. You’ll be expected to be a versatile and entreprenurial Software Engineer who loves code and can make things work, using your skills both to build software in the team and to opine as a subject matter expert on how our AI generates code. You’ll collaborate closely with our wider engineering team as well as product and design. We have the resources to afford large experiments and push the state of the art, and our team has a wealth of experience in delivering tools for developers that work at scale.
What we’re looking for
We’re looking for someone who is as excited as we are to be part of a dynamic team that is shaping the future of AI and software development.
Essential
Nice to have
What you’ll do
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:
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