Senior Java Backend Engineer Amsterdam

Build a smart, realtime energy platform from scratch that helps balance the power grid | EnergyTech | Java 21/25, Spring Boot, Azure, CosmosDB, cloud-native, realtime data | €90.000

Amsterdam
€ 90.000

Java

Spring Boot

Azure

Event Driven

AI-tooling

Vacancy: Senior Java Backend Engineer Amsterdam

Do you want to build a new platform from scratch, without legacy, and make the fundamental architecture choices that last for years?
Do you want to build software that handles power intelligently and helps balance and green the energy grid?
Are you looking for a place where you really give direction as a senior: shaping architecture, sparring with the CTO and architect, and making the team stronger?
And do you say yes to a salary up to €90.000, hybrid working, and work whose impact you see every day?

Then read on.

Your employer: a small but stable Amsterdam tech company that handles power intelligently

You join a small but stable Amsterdam tech company working at the intersection of software and energy. They build a platform that handles power and capacity intelligently, so energy is used more efficiently and the grid is less heavily loaded. The company has grown healthily and organically over the years. That brings calm: here you build software that is allowed to become truly good, and that you keep building on for years.

The operational base has proven itself: thousands of connected devices, and the metering, reporting and billing all run. That business model stands. Now the real work begins: they are building the new, intelligent energy platform entirely from scratch, one that decides in realtime when and where you charge, where capacity is available, when power is cheap and when the grid is heavily loaded. You step in at line one, without legacy, and make the choices that set the course for years. That is exactly why they are bringing in a senior.

The team is small and close-knit: a CTO, a few engineers and you as the senior who helps set the technical direction. You spar with the CTO, strengthen the mediors and establish standards around architecture, reliability and observability. So you have plenty of ownership and leave a real mark on how the platform and the team develop. That makes your work visible and meaningful.

Your role: Senior Java Backend Engineer Amsterdam

As a Senior Java Backend Engineer you help build the core of a brand-new platform, with Java 21/25, Spring Boot, Docker, Azure and CosmosDB in a cloud-native, event-driven environment. You design and build the services that process large volumes of metering and session data from scratch, and you make the architecture choices that determine whether the platform can scale reliably.

The real challenge is realtime. How do you process continuously incoming data and make reliable decisions on it, for example to charge when power is cheap or to throttle back when the grid is under heavy load? How do you keep such a system correct and available as the number of devices grows? These are the questions you sink your teeth into, with direct impact on the energy supply.

You are more than a builder here. You give technical direction, mentor the mediors and raise the engineering level. In practice, colleagues look to you for the course, even without a formal team-lead title.

What are we looking for?

At least 6 years of experience as a backend engineer
Strong in Java, Spring Boot, Quarkus or a similar framework
Experience building greenfield and making architecture choices is a strong plus
Experience with realtime systems is a plus
Comfortable with a cloud platform (Azure a plus, AWS or GCP also fine)
You use AI tools such as Claude Code to increase your impact
You take ownership and make the people around you better
Good command of Dutch and English