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Fluxion career site
Product · Helsinki

Fullstack Developer - Backend Focus

Fluxion is at a rare stage where the hardest problems are still unsolved — and your decisions will shape how the product, technology, and culture evolve

Build the modeling engine that powers everything

As a Fullstack Developer with a backend bias, you’ll focus on Fluxion’s core systems: the graph-based modelling engine, APIs, and infrastructure that make complex business modelling possible — and fast.

You’ll still work across the stack, but your main impact is in correctness, performance, and scalable architecture.

What you’ll do

  • Design and build core backend systems for modelling, simulation, and scenario planning

  • Develop APIs and data models that support rich frontend and AI workflows

  • Integrate AI capabilities into core product logic

  • Make architecture decisions balancing speed, reliability, and enterprise requirements

  • Work closely with frontend, design, and AI to ship end-to-end features

About you

  • Strong backend experience with solid understanding of fullstack systems

  • Comfortable with complex data models, performance trade-offs, and system design

  • Experience building production SaaS systems with real users and constraints

  • Pragmatic, collaborative, and excited to build from zero to one

Department
Product
Role
Fullstack Developer - Backend Focus
Locations
Helsinki

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About Fluxion

Fluxion is a decision intelligence platform that empowers forward-looking teams to answer their toughest “what-if” questions with confidence. Using AI-native scenario modeling, Fluxion lets organizations explore assumptions and simulate outcomes across financial and operational models in real time — without rebuilding spreadsheets or rigid tools. Its semantic approach to decision modeling keeps assumptions explicit, preserves causality, and delivers traceable, explainable insights so teams make better decisions faster. Designed for high-impact decisions under uncertainty, Fluxion replaces fragile, manual exploration with a dynamic environment where curiosity is cheap, safe, and continuous.

Product · Helsinki

Fullstack Developer - Backend Focus

Fluxion is at a rare stage where the hardest problems are still unsolved — and your decisions will shape how the product, technology, and culture evolve

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