Senior Backend Engineer

What you'll do You'll spend most of your time building software. Depending on the project, that might mean: - 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. We expect senior engineers to take ownership beyond their own tickets. If something doesn't make sense, question it. If there's a simpler solution, suggest it. If something should be fixed, fix it. ## You might like working here if You genuinely enjoy software engineering. You're comfortable moving between understanding the customer's problem, sketching an architecture, digging through an unfamiliar API, and writing the code that ultimately solves it. You care about good engineering, but don't confuse complexity with quality. You know that sometimes the right solution is a carefully designed distributed system, and sometimes it's a straightforward service with a database. You like autonomy, short decision paths, and seeing what you build being used in the real world. And you probably get slightly annoyed when a meeting could have been a Slack message. ## What we're looking for We care more about engineering ability than matching an exact technology checklist. But you'll probably have: - 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 Experience as a Tech Lead, Lead Developer, or senior engineer with significant technical ownership is valuable, but having held a particular title isn't important. ## Even better if you've worked with - Energy, IoT, or connected products - Event-driven or distributed systems - Large-scale time-series data - Kafka - Kubernetes - TimescaleDB, PostgreSQL, or similar technologies - Databricks, Spark or Airflow - Optimization, forecasting, or machine learning - Industrial systems, edge computing, or OT/IT integrations You definitely don't need to know all of these. ## How we think about engineering **Ship useful things.** Software creates value when someone uses it. **Keep it simple.** Complexity has to earn its place. **Own the problem.** Don't just implement requirements. Understand what we're actually trying to achieve. **Use the best tool for the job.** We're not interested in technology for technology's sake. **AI is part of modern software engineering.** We expect our engineers to use modern AI tools where they make them faster and better, while still understanding the systems and code they build. **Leave things better than you found them.** Good engineering compounds. We want every project to improve the way we build the next one. ## Why Helicon? Because there aren't many places where a backend engineer gets to work with problems spanning cloud software, large-scale data, physical infrastructure, and the energy system. We're small enough that good engineers have a real influence on how things are built. You'll work alongside experienced engineers and data scientists, have significant technical autonomy, and get close to both the customer and the actual problem. And you'll get to build software where changing a few lines of code can ultimately change how a building, battery, or energy system behaves in the physical world. That's pretty cool. Department[Engineering](https://helicontechnologies.teamtailor.com/departments/engineering)Role Backend Developer Location Stockholm Remote status Hybrid Garvargatan 9C 112 21 Stockholm Sweden [Directions](https://www.google.com/maps?q=59.32808699999999,18.0440455) [+](https://helicontechnologies.teamtailor.com/jobs/8403126-senior-backend-engineer# "Zoom in") [−](https://helicontechnologies.teamtailor.com/jobs/8403126-senior-backend-engineer# "Zoom out") [Protomaps](https://protomaps.com/) © [OpenStreetMap](https://openstreetmap.org/copyright) At Helicon we build digital products that matter. As a digital product development and innovation agency specializing in cleantech, we partner with forward-thinking businesses to create breakthrough products, platforms and capabilities that drive sustainability and efficiency. Our journey has taken us from developing one of Sweden’s largest virtual power plants by connecting more than 15,000 buildings, to using AI to optimize energy, water and resource management worldwide. We have also helped launch award winning cleantech startups and SaaS solutions for the energy sector. We measure success not only by the results we deliver to our customers but also by the real world sustainability gains our solutions create. When clients tell us that our work helped shut down a coal and oil power plant, integrate more renewables into their portfolio or cut 36,000 tons of CO₂ emissions annually, we take immense pride in that. What drives us is a shared passion for solving complex challenges through strategy, design, engineering and data science. At Helicon speed, curiosity, collaboration and continuous learning are at the heart of how we work. If you are passionate about technology