Full Stack Engineer

Tact; Rotterdam; On-site; EUR 54,000 - 66,000; Full time

Benefits offered by this job

Equity

Job summary

Tact is seeking a Full Stack Engineer (Backend / Data / AI) in Rotterdam with strong Python and FastAPI experience. You will own sizable parts of the product, from improving extraction pipelines and models to data engineering and shipping production features.

The role emphasizes ownership and impact, with AI-native workflows and high-trust engineering culture.

Qualifications

• Proficient Python development with production experience.
• Strong background in AI, ML or data engineering is a plus.
• Back-end systems design and scalable data pipelines.

Responsibilities

• Build backend features and data pipelines for AI-driven products.
• Develop production-grade APIs and services using FastAPI.
• Collaborate across data, infra, and product to ship features.

Skills

Python

FastAPI

AI

Data engineering

Backend development

Job description

Full Stack Engineer (Backend / Data / AI) | Python / FastAPI | Up to €60k + Equity | Rotterdam

AI-powered products shipped straight into production, previously exited founders, and real ownership over what you build.

This Rotterdam-based company is led by founders who have built and exited before, and they know exactly what it takes to scale a product. This is a key engineering hire, and you'll have a genuine say in how the product evolves.

Despite the title, the role currently leans backend, data and AI. You'll own significant parts of the product end-to-end, from improving extraction pipelines and models through to data engineering and shipping production features, with frontend work when needed.

The biggest sell is the ownership. There's no waiting for tickets or working on a tiny slice of someone else's roadmap. You'll pick up real problems, solve them properly and see the impact straight away.

The engineering culture is AI-native. Developers actively use LLMs throughout their workflow to move fast, but strong engineering fundamentals are what make it work.

They're looking for someone with a strong Computer Science or software engineering background, solid Python and FastAPI experience in production, and the appetite to work across different areas rather than specialise. Experience with AI engineering, machine learning, data engineering, agent harnesses, TypeScript or SQL is a big plus.

It's a high-trust, high-ownership environment where flexibility comes as standard and holiday isn't closely monitored. This suits someone who genuinely wants to go all in on building something great.

Rotterdam | Full-time in office