Senior Fullstack Engineer – AI Platform

About the role

SoSafe is building an AI platform that powers the next generation of AI capabilities across its cybersecurity awareness products. As a Senior Fullstack Engineer you will create shared infrastructure, tooling and services that enable engineering teams to build, deploy and operate AI safely and at scale.

Key responsibilities

• Build core capabilities of the Agentic AI Platform, including agent runtimes, model routing, tool registries and shared services.
• Design and implement production‑grade platform services and developer tooling using Node.js, TypeScript, NestJS and React.
• Develop reusable AI infrastructure that lets teams deploy and operate AI agents securely and at scale.
• Work hands‑on with LLMs, LangChain/LangGraph and agent orchestration, addressing governance, observability and scalability challenges.
• Own features end‑to‑end from architecture through deployment and continuous improvement.

Required profile

• Strong experience building modern full‑stack applications with Node.js, TypeScript and React.
• Hands‑on experience with AI‑powered applications or platforms using LLMs, AI agents, LangChain, LangGraph or similar technologies.
• Platform mindset with a passion for building reusable systems, APIs and tooling.
• Ability to thrive in ambiguity, take ownership and solve complex engineering problems in a fast‑moving environment.

Required skills

• Node.js
• TypeScript
• React
• NestJS
• LLMs
• LangChain
• LangGraph

What we offer

• Flexible hours and 33 vacation days.
• Wellbeing and financial support, including access to Open Up and corporate discounts.
• Virtual events, collaborative team activities and local meet‑ups.
• Tech equipment, referral bonuses and a dog‑friendly HQ.