Senior Fullstack Developer - Optimization Team (m/w/d) Green-Tech Start Up

Core responsibilities:

• Collaborate with your team to understand underlying problems and requirements
• Engineer requirements into viable, pragmatic software designs
• Contribute to team planning by helping define tasks, priorities, and timelines
• Write software – implement end-to-end, from database model to frontend

This role creates positive change by developing software that optimizes heating systems in residential buildings, reducing emissions and energy consumption to actively drive forward the energy transition and fight climate change.

Required skills and qualifications:

• Solid educational background – ideally a degree in Computer Science or a related field
• 5+ years of professional experience in software development
• Solid experience across frontend and backend – especially with TypeScript, Next.js, SQL
• Ability to write high-quality, production-ready code and streamlined APIs
• Strong communication and collaboration skills to take on responsibility and work closely with other engineers
• Independent, structured working style
• Fluent in English

Benefits include:

• Employee perks like Urban Sports Club or Become1 membership
• Flexible working hours and remote work – continue working from home even post-pandemic
• Continuous learning – through on-the-job challenges, an open feedback culture, and supported professional development
• Real impact – contribute directly to the energy transition and help fight climate change every single day
• Team appreciation – regular team events are an essential part of our culture
• The best team Berlin has to offer – or maybe even beyond

Green Fusion develops software that optimizes the control of heating systems in residential buildings to fight climate change by reducing emissions and energy consumption, actively driving forward the energy transition.