Senior Backend Engineer - Energy Management @Optima

Optima is part of the Heizma group. Our goal is green energy for everybody. At Optima, we set out to build one of the world’s most advanced energy management platforms. We firmly believe that affordable yet flexible energy management will be essential for transitioning fully into renewables.

To achieve this goal, our team operates on all layers of the stack - from hardware installations at end customers, towards crunching millions of data rows per day in the cloud.

As Senior Backend Engineer, your task will be developing, testing, and maintaining our backend platform. Energy infrastructure is critical, and we acknowledge the importance of rock-solid engineering.
Our system ingests dozens of millions of data points from thousands of IOT devices per day, orchestrates asynchronous processing tasks, and keeps configuration in sync across the entire device fleet. And all that in a highly demanding multi-tenant setup while expecting high customer growth. Additionally, you will be responsible for backend user flows like registration and device setup, but if you can handle the above, you will probably be able to just vibe code those.

If things like CRDTs, Fault Tolerance, Message Brokers and Timeseries Databases excite you, this job is for you.

• Develop, test and maintain our .NET backend platform as well as our .NET embedded software system
• Build features that span thousands of IOT devices and cloud applications
• Build interfaces to other providers in the energy space
• Design and implement solutions to ingest and process millions of data rows per day
• Help with designing the infrastructure for asynchronous machine learning and data processing tasks
• Ensure reliability and maintainability across the entire project

• Be a team player with a growth mindset and in for the shared mission
• Be highly experienced in writing scalable and robust backends. Being skilled at testing is a must.
• Have solid experience in C# and Postgres
• Experience with cloud technologies and infrastructure as code is a big plus

• A competitive salary of at least €70.000
• Flexible remote policy
• Work on something meaningful, with a team that’s here for the same mission
• A fast paced environment, that still puts psychological safety and growth first
• Potential to transition into a leading role as our team grows

Application Process:

• Screening Call (we’ll talk about your background & mutual expectations)
• Tech Interview (with live coding)
• Take Home Exercise
• Culture Fit Interview

Are you ready to become part of our team and make a difference in the world? Then we look forward to receiving your application!

At Optima, we value and promote equal opportunities and diversity in our team, as we firmly believe that different perspectives strengthen our innovative power. Regardless of gender, age, ethnicity, religion, sexual orientation, disability or other personal characteristics - everyone is welcome and respected at Heizma. Our recruitment practices aim to minimize prejudice and ensure fair treatment of all applicants. Together, we are not only working on the heating transition, but also on shaping a more sustainable and inclusive future.