Tessl
Tessl is a fast‑growing Series A startup in London, founded by Guy Podjarny. We’ve raised over $100M from world‑class investors, including Index Ventures, Accel, GV, and Boldstart, and in June 2025 we were ranked #2 in Sifted EU’s 2025 B2B SaaS Rising 100. In September 2025 we launched our first products – the Tessl Framework and Tessl Spec Registry – which integrate with any agent to keep it on rails and well‑informed through Spec‑Driven 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.
Overview of Role We’re looking for a
Senior Developer Advocate
with a passion for AI developer tools. In this role, you’ll primarily be an internal user of our product, providing feedback to our engineering team and creating and promoting high‑quality Tessl‑centric content that helps developers better understand and utilize AI Native Development practices with our product. A core part of this role is to collaborate with the community and industry vendors to showcase best practices, as well as nurturing our users to share their own thoughts and creations.
Key Responsibilities
Active User: Be immersed in the Tessl product and community, learning firsthand to create compelling learning experiences for internal and external groups to follow.
Content Creation: Write detailed articles, tutorials, docs, videos, and guides about Tessl as an AI‑powered development tool, focusing on clear, actionable, and practical insights.
Community Collaboration: Engage with users and partners to help and highlight their integrations and successes with the product.
AI Developer Tooling: Play with, test, and explore various AI‑powered tools for developers.
Developer Relations: Participate in various Developer Relations activities, including webinars and podcasts, and engage with the developer community through forums and social media platforms.
What You’ll Need
Passion for AI: A natural curiosity and love for exploring and testing AI‑powered development tools.
Strong Writing Skills: Ability to write clear, concise, and engaging technical content that appeals to developers.
Communication Skills: Ability to work with internal teams, vendors, and community members to create and curate content.
Development Skills: Familiarity with software development and modern dev tools, and an eagerness to learn more. No need to be an expert, but some hands‑on experience is preferred.
Growth Mindset: Embrace challenges and seek opportunities for learning and improvement.
Nice to Have
Community Engagement: Experience (or interest) in working with open‑source communities, as well as via Discord, etc.
Adaptability: Ability to adjust to changing priorities and thrive in a fast‑paced, dynamic environment.
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 commensurate with experience and skills and employee share options.
Benefits: 25 days holiday, health insurance (including dental and vision, which extends to partners and dependents), a company‑matched pension, a commuting stipend for those who live outside London, and a cycle‑to‑work scheme.
Application Process
Initial screen with our Operations team
DevRel discussion led by our Head of Developer Relations
AI tooling discussion with a member of our DevRel team
Take‑home task followed by an in‑person presentation with IT skills
Final interview with Tessl CEO
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!
Seniority Level Mid‑Senior level
Employment Type Full‑time
Job Function Engineering and Information Technology
#J-18808-Ljbffr
Overview of Role We’re looking for a
Senior Developer Advocate
with a passion for AI developer tools. In this role, you’ll primarily be an internal user of our product, providing feedback to our engineering team and creating and promoting high‑quality Tessl‑centric content that helps developers better understand and utilize AI Native Development practices with our product. A core part of this role is to collaborate with the community and industry vendors to showcase best practices, as well as nurturing our users to share their own thoughts and creations.
Key Responsibilities
Active User: Be immersed in the Tessl product and community, learning firsthand to create compelling learning experiences for internal and external groups to follow.
Content Creation: Write detailed articles, tutorials, docs, videos, and guides about Tessl as an AI‑powered development tool, focusing on clear, actionable, and practical insights.
Community Collaboration: Engage with users and partners to help and highlight their integrations and successes with the product.
AI Developer Tooling: Play with, test, and explore various AI‑powered tools for developers.
Developer Relations: Participate in various Developer Relations activities, including webinars and podcasts, and engage with the developer community through forums and social media platforms.
What You’ll Need
Passion for AI: A natural curiosity and love for exploring and testing AI‑powered development tools.
Strong Writing Skills: Ability to write clear, concise, and engaging technical content that appeals to developers.
Communication Skills: Ability to work with internal teams, vendors, and community members to create and curate content.
Development Skills: Familiarity with software development and modern dev tools, and an eagerness to learn more. No need to be an expert, but some hands‑on experience is preferred.
Growth Mindset: Embrace challenges and seek opportunities for learning and improvement.
Nice to Have
Community Engagement: Experience (or interest) in working with open‑source communities, as well as via Discord, etc.
Adaptability: Ability to adjust to changing priorities and thrive in a fast‑paced, dynamic environment.
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 commensurate with experience and skills and employee share options.
Benefits: 25 days holiday, health insurance (including dental and vision, which extends to partners and dependents), a company‑matched pension, a commuting stipend for those who live outside London, and a cycle‑to‑work scheme.
Application Process
Initial screen with our Operations team
DevRel discussion led by our Head of Developer Relations
AI tooling discussion with a member of our DevRel team
Take‑home task followed by an in‑person presentation with IT skills
Final interview with Tessl CEO
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!
Seniority Level Mid‑Senior level
Employment Type Full‑time
Job Function Engineering and Information Technology
#J-18808-Ljbffr