Senior Backend Engineer for Energy Optimization Systems

Fifty Energy AB; Stockholms kommun; On-site; SEK 549,028 - 768,639; Full time

Job summary

A forward-thinking energy tech company is seeking a Senior Backend Developer to build high-impact systems and influence architecture. The successful candidate will develop scalable backend services in Python and work with cloud-native architectures. Applicants should have strong Python experience and a solid understanding of backend systems. This role offers the chance to be part of an ambitious engineering team focused on energy optimization and innovation. The position is based in Stockholm and requires a valid work permit for Sweden.

Qualifications

• Strong experience with Python in production-grade systems.
• Deep understanding of backend architecture, distributed systems, and API design.
• Experience with cloud environments (preferably Kubernetes-based).
• A structured, proactive way of working.

Responsibilities

• Building scalable backend services in Python for the MMO engine.
• Developing cloud-native systems running on Kubernetes.
• Designing and improving APIs for various applications.
• Working closely with cross-functional teams to deliver features.

Skills

Python

Backend architecture

Distributed systems

API design

Cloud environments (Kubernetes)

Tools

Kubernetes

TimescaleDB/Postgres

Job description

A forward-thinking energy tech company is seeking a Senior Backend Developer to build high-impact systems and influence architecture. The successful candidate will develop scalable backend services in Python and work with cloud-native architectures. Applicants should have strong Python experience and a solid understanding of backend systems. This role offers the chance to be part of an ambitious engineering team focused on energy optimization and innovation. The position is based in Stockholm and requires a valid work permit for Sweden.