Senior Full-Stack Engineer (React/Python) (+ Equity) at YC-backed AI-native enterprise

What You’ll Be Doing

• Design, develop, and maintain frontend applications using React and Next.js.
• Build, test, and deploy backend services and APIs (Python/Django/FastAPI preferred).
• Collaborate with founders, growth team, designers, and other engineers to deliver high-impact features.
• Ensure scalability, performance, and security across the stack.
• Implement CI/CD pipelines, automated testing, and monitoring solutions.
• Contribute to infrastructure planning, deployment, and optimization in cloud environments (AWS, GCP, or Azure).
• Develop and deploy AI-powered features in production, including RAG systems and multi-agent infrastructure.
• Create data pipelines for AI model training, evaluation, and continuous improvement.
• Mentor junior developers and promote engineering best practices.

What We’re Looking For

• 5+ years of professional software engineering experience.
• Proven experience with React and Next.js in production environments.
• Strong backend development skills (Python preferred).
• Solid understanding of relational and/or NoSQL databases.
• Experience with Git and collaborative development workflows.
• Knowledge of cloud infrastructure, containerization (Docker, Kubernetes), and CI/CD pipelines.
• Experience implementing background workers and task queues (Celery, RQ, etc.).
• Proficiency with Redis for caching, pub/sub, or job queues.
• Hands‑on experience building and deploying AI applications in production environments.
• Experience implementing RAG pipelines, AI agent orchestration, model fine‑tuning, and performance monitoring.
• Familiarity with LLM evaluation techniques and tools for measuring model accuracy, reliability, and safety.

Compensation & Benefits

• Competitive salary £100,000 – £200,000 GBP + equity.
• Performance‑based incentives.
• Opportunity to be instrumental in our expansion into the APAC market.
• Supportive and innovative work environment.

About the Company

The client is an AI‑native workspace initially designed for investment banking, private equity, consultancies, and asset managers. The company is led by two well‑known founders who have successfully sold their last two YC‑backed companies. They have raised significant funding from Y Combinator and top‑tier venture firms, with live deployments at prestigious global institutions. The team operates across New York, London, and Hong Kong, aiming to become the leading AI application platform for enterprise.

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