Senior Backend Engineer - Fastned

Join a fast-growing, listed company with a purpose! Fastned owns and operates a network of 400+ fast charging stations across 10 European countries, allowing electric vehicle drivers to charge their car with 100% green energy in just 15 minutes. Our goal is a European network of 1000 fast charging stations in prime locations, where all electric vehicles can charge with renewable energy from the sun and wind. We have recently been voted best charging network in the UK, France and the Netherlands. If you want to make a difference and work in an informal, international scale-up environment with future prospects, then read on!

Your role

Fastned is a pioneer in a completely new industry, aiming to accelerate the transition towards sustainable mobility by giving freedom to electric drivers. As a Senior Backend Engineer in our Charging team you'll be at the core of the team we're building. The Charging team owns all digital communication with our chargers via the industry-standard OCPP protocol, covering the full session lifecycle and driver-facing experiences such as Autocharge and Plug & Charge. With 23,000+ charging sessions a day and billions of messages a year flowing through our systems, the services you build are business-critical — our team and EV drivers rely on them every day.

With your in-depth knowledge of Kotlin, Spring Boot (microservices), AWS, Kubernetes, Kafka, SQL, GitLab CI/CD and REST APIs , you create the scalable, high-availability services that ensure our customers can charge at any time. We're now evolving the charging stack to integrate with the MSP (Mobility Service Provider) proposition Fastned is building in-house — so there's a lot to build. As a senior engineer you'll set the technical bar and act as a key sparring partner for your team of fellow Backend Engineers, an Engineering Manager and a Product Manager.

Your overall responsibilities include

Designing, developing, testing and reviewing reusable, maintainable and scalable code for Fastned's charging platform and infrastructure;

Delivering core charging milestones: the migration from OCPP 1.6 to OCPP 2.x, Autocharge and Plug & Charge, and our shift to advanced maintenance using granular data and ML/AI modelling;

Working AI-first: using AI-augmented engineering (Claude Code, agentic workflows and AI tooling) as a natural part of how you design, build, test and review — with judgment for where AI is a multiplier and where humans stay in the loop;

Overseeing technical development from ideation to deployment, and taking operational responsibility for what you build (monitoring, alerting, incident analysis);

Helping improve engineering methodologies and best practices, and mentoring others as a tech lead in the Charging team.