Senior Backend Engineer: Energy APIs & Systems

Helicon Technologies AB; Stockholms kommun; On-site; SEK 700,000 - 900,000; Full time

Job summary

Helicon Technologies AB in Sweden is seeking a Senior Backend Engineer to help build the energy software systems that connect assets, time-series data, and energy markets. You’ll design and implement backend services, APIs, and data platforms that scale across thousands of devices and millions of measurements.

You’ll work with cloud platforms (AWS/Azure/GCP), modern containers, and distributed architectures, while keeping reliability and maintainability at the forefront.

Qualifications

• 5+ years of professional software development experience.
• Strong backend development skills, preferably with Python.
• Experience designing APIs, integrations, and backend services.
• Experience with relational databases and data modelling.
• Experience with AWS, Azure, or GCP.
• Good understanding of Docker, Git, and CI/CD.
• Experience designing and operating production systems.
• The ability to reason about architecture, performance, reliability and maintainability.
• The ability to communicate technical decisions clearly.
• Professional proficiency in Swedish and English.

Responsibilities

• Designing and building backend services, APIs and integrations.
• Building systems for ingesting and processing large amounts of energy and time-series data.
• Connecting cloud software with devices, industrial systems and third-party platforms.
• Designing data models and distributed architectures.
• Building services for forecasting, optimization and control.
• Taking a problem from a conversation with a customer all the way to running software in production.
• Making architectural decisions without turning every decision into an architecture project.
• Reviewing code and helping other engineers become better.
• Taking technical leadership of a project or small engineering team when needed.

Skills

5+ years of experience

Python

APIs & backend

Relational databases

Cloud platforms

Docker & CI/CD

Production systems

Architecture & design

Swedish & English

Tools

Kafka

Kubernetes

TimescaleDB

PostgreSQL

Databricks

Spark

Airflow

Job description

Helicon Technologies AB in Sweden is seeking a Senior Backend Engineer to help build the energy software systems that connect assets, time-series data, and energy markets. You’ll design and implement backend services, APIs, and data platforms that scale across thousands of devices and millions of measurements.

You’ll work with cloud platforms (AWS/Azure/GCP), modern containers, and distributed architectures, while keeping reliability and maintainability at the forefront.