Senior Full-stack Engineer

About H: H exists to push the boundaries of superintelligence with agentic AI. By automating complex, multi-step tasks typically performed by humans, AI agents will help unlock full human potential.

H is hiring the world’s best AI talent, seeking those who are dedicated as much to building safely and responsibly as to advancing disruptive agentic capabilities. We promote a mindset of openness, learning and collaboration, where everyone has something to contribute.

Holistic, Humanist, Humble.

About the Team: The Product Engineering Team is committed to ensuring the successful implementation of our Agents platform for Web Automation. The platform will empower a wide range of professionals, from Web Testing engineers, who ensure websites behave as intended, to automation professionals, who automate data collection and interactions on complex websites.

Key Responsibilities:

• Design and implement secure, robust and scalable services via REST/gRPC

• Handle database interactions, including schema design, querying, and optimization

• Integrate third-party APIs and services

• Implement integration and end-to-end tests to ensure code quality

• Develop responsive web interfaces and connect them to backend APIs

• Set up and maintain continuous integration and deployment workflows

• Ensure application reliability via logging/monitoring/alerting

• Follow best practices to avoid vulnerabilities and adhere to industry standards

Requirements:

• Technical skills:

  • Strong 4+ years of experience in Python backend development (Flask, Django, FastAPI or similar) and HTML5, CSS3, JavaScript, React/Redux (ideally) or similar frameworks on the front-end

  • Proven ability to design and build REST or gRPC APIs

  • In-depth experience with distributed systems or cloud computing, preferably in AWS

  • Expertise in relational and/or non-relational databases

  • Experience working with message queueing technologies (SQS/RabbitMQ/Kafka/etc.)

  • Experience with browser security and cross-browser compatibility techniques

  • Good understanding of coding standards, architectural patterns and test frameworks

  • Expertise in instrumentation, observability and monitoring

  • Experience with CI/CD pipelines, local development via Docker and build/package tooling

Location:

• H's teams are distributed throughout France, the UK, and the US

• This role has the potential to be fully remote or hybrid for candidates based in cities where we have an office - currently Paris and London

• The final decision for this will lie with the hiring manager for each individual role

What We Offer:

• Join the exciting journey of shaping the future of AI, and be part of the early days of one of the hottest AI startups

• Collaborate with a fun, dynamic and multicultural team, working alongside world-class AI talent in a highly collaborative environment

• Enjoy a competitive salary

• Unlock opportunities for professional growth, continuous learning, and career development

If you want to change the status quo in AI, join us.