Senior Fullstack Engineer- AI Platform

SoSafe GmbH; Lisboa; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Work/Life balance: Flexible hours, 33

Wellbeing and financial support: Open

Connection & community: Virtual events

Job summary

SoSafe GmbH seeks a Senior Fullstack Engineer to help build the AI Platform's core capabilities and tooling. You will work on Node.js/TypeScript/React-based services, implement AI-enabled features, and own end-to-end software delivery in a fast-moving environment.

You’ll collaborate with a small autonomous team, shaping platform architecture, governance, and scalability while shipping production-grade services and reusable components for engineering teams across SoSafe.

Qualifications

• Strong experience building modern full-stack applications with Node.js, TypeScript and React.
• Hands-on experience building AI-powered applications or platforms using LLMs, AI agents, LangChain, LangGraph, MCP or similar technologies.
• A platform mindset—you enjoy building reusable systems, APIs and tooling that help other engineers move faster.
• Confidence using AI coding tools as part of your daily workflow while applying sound engineering judgment to architecture, code quality and technical decisions.
• The ability to thrive in ambiguity, take ownership and solve complex engineering problems in a fast-moving environment.
• Experience with developer platforms, distributed systems, infrastructure-as-code, cloud-native architectures or AI governance is a strong advantage.

Responsibilities

• Build the core capabilities behind SoSafe's Agentic AI Platform, including agent runtimes, model routing, tool registries and shared platform services.
• Design and build production-grade platform services and developer tooling using Node.js, TypeScript, NestJS and React.
• Develop reusable AI infrastructure that enables engineering teams to build, deploy and operate AI agents securely and at scale.
• Work hands-on with LLMs, LangChain/LangGraph and agent orchestration, solving platform challenges around governance, observability and scalability.
• Own features end-to-end—from architecture and implementation through deployment and continuous improvement.
• Shape the future of AI engineering at SoSafe by contributing ideas, improving developer experience and influencing platform architecture.

Skills

Node.js

TypeScript

React

LangChain

LangGraph

Agent orchestration

Tools

NestJS

MCP

Job description

Senior Fullstack Engineer- AI Platform

SoSafe has the ambition to become the leading human risk management provider in Europe. Our award-winning awareness platform triggers behavioural change by providing effective and engaging training and simulations on cybersecurity and data protection. Cybercrime is costing the world >$10 trillion annually and growing by 15% p.a. - we invite you to be part of the solution!

Location Requirement: This role is open to candidates currently based in and legally authorized to work in Portugal. We are unable to consider applicants outside these locations.

Why Us?

AI is transforming how software is built. At SoSafe, you'll join the team building the AI platform that powers the next generation of AI capabilities across our products.

Rather than building individual AI features, you'll create the shared infrastructure, tooling and services that enable every engineering team to build, deploy and operate AI safely and at scale. Working in a small, highly autonomous team, you'll have real ownership, shape technical direction, and build systems that engineers across SoSafe rely on every day.

Here's how you'll make a difference

• Build the core capabilities behind SoSafe's Agentic AI Platform, including agent runtimes, model routing, tool registries and shared platform services.

• Design and build production-grade platform services and developer tooling using Node.js, TypeScript, NestJS and React.

• Develop reusable AI infrastructure that enables engineering teams to build, deploy and operate AI agents securely and at scale.

• Work hands-on with LLMs, LangChain/LangGraph and agent orchestration, solving platform challenges around governance, observability and scalability.

• Own features end-to-end—from architecture and implementation through deployment and continuous improvement.

• Shape the future of AI engineering at SoSafe by contributing ideas, improving developer experience and influencing platform architecture.

What you'll bring

• Strong experience building modern full-stack applications with Node.js, TypeScript and React.

• Hands-on experience building AI-powered applications or platforms using LLMs, AI agents, LangChain, LangGraph, MCP or similar technologies.

• A platform mindset—you enjoy building reusable systems, APIs and tooling that help other engineers move faster.

• Confidence using AI coding tools as part of your daily workflow while applying sound engineering judgment to architecture, code quality and technical decisions.

• The ability to thrive in ambiguity, take ownership and solve complex engineering problems in a fast-moving environment.

• Experience with developer platforms, distributed systems, infrastructure-as-code, cloud-native architectures or AI governance is a strong advantage.

What we offer*

• Work/Life balance: Flexible hours, 33 vacation days

• Wellbeing and financial support: Access to Open Up, corporate discounts

• Connection & community: Virtual events, collaborative team activities, and opportunities for local meet-ups

• And the list goes on: Tech equipment, referral bonuses, dog-friendly HQ

*Perks and benefits listed above are for full-time employees and may vary slightly by office location. These are just a sample - you'll learn more during the interview process.

About Us

At SoSafe, we're on a mission to make the digital world safer by addressing the human factor in cybersecurity. As one of the fastest-growing security awareness scale-ups worldwide, we leverage behavioural science and data-driven learning to empower people against cyber threats. Our Human Risk Management approach helps organisations turn their employees into their strongest line of defence.

Backed by leading VCs like Highland Europe and Global Founders Capital, we're rapidly expanding across the globe. We're looking for team players who want to drive meaningful change in cybersecurity, take ownership of their work, and grow with us.

If you thrive in a vibrant, purpose-driven environment that values innovation, diversity, and collaboration, then this is the place for you!