Marktplaats in The Netherlands, and 2dehands and 2ememain in Belgium, are part of Adevinta: a global online classifieds specialist. The three brands are hosted on a multi-tenant platform, operated from our Amsterdam location, and are the top players in the classifieds space throughout the Benelux region.

We offer consumers the opportunity to trade their unwanted products and contribute to a greener, circular economy. We offer businesses - of all sizes, from the smallest hobbyist to the biggest brands in Benelux - a platform to showcase their goods and services online to over 11 million monthly unique users.

What you’ll do ​& Who you are

About the team:

You will join our multi-disciplinary C2C Sellers team in Amsterdam as a Senior Backend Developer, reporting to the team’s Engineering Manager. Our tight-knit, cross-functional team includes Front-end, Mobile, Backend and Data Science engineers (plus product and design partners).

We focus on creating direct, measurable value for individual sellers — our mission is a smooth, quick and safe sale for a good price that gives sellers confidence to list again. The team’s current priority is delivering a GenAI-powered ad placement flow that requires production-grade backend systems: real-time model serving, robust feature and event pipelines, low-latency APIs for FE/Mobile, and a safe experimentation infrastructure.

The Backend Developer will own the backend contract surface, observability and runbooks that enable reliable, scalable and auditable GenAI/ML rollouts to increase seller success.

We take a data-driven, experimental, and Agile approach to product development with heavy use of A/B testing, and insights-driven feature research.

What you'll do:

• Design and implement scalable, reliable, and maintainable software solutions.

• Write clean, efficient, and well-tested code using industry best practices.

• Mentor junior and mid-level developers

• Help to improve work in all areas: coding, processes, testing, tools, collaboration

• As an engineer, you’re not limited to Backend development, but will have the opportunity to collaborate with other technical stacks in our company

• Promote engineering practices within the team and across the organisation as a part of the Backend chapter

• Work collaboratively in a hybrid work model (at least once a week in the office)

• We will work with you to grow your skills and your career at Marktplaats.
  

Who you are:

You have experience in software development in the online arena with a large user base. At least 6+ years of full-time employment on large and distributed systems. You like and breathe Agile development, focus on delivering, and like to take an active role in improving how we work. You already live in the Netherlands and are entitled to work here.

Core Skills:

• Experience running large systems written in JVM languages like Java, Kotlin or preferably Scala.

• Experience in event-driven microservices architecture.

• Experience with observability tools such as Kibana, Grafana or Prometheus or DataDog or other cloud solutions

• Experience running services in cloud environments like AWS or GCP.

• Experience with relational databases (like MySQL) and NoSQL (like Cassandra).

• Familiarity with designing REST apis.

• Experience with Kafka, ElasticSearch, RabbitMQ, and Terraform.
  

Bonus Skills:

• Familiarity with observability tools.

• Experience with Node.js.

• Experience with ML/GenAI productionization, including:

  • Model serving & inference (real-time and batch)

  • Real-time or near-real-time feature pipelines

  • Model and data monitoring (drift, data quality, alerting)

  • Safe rollout practices (feature flags, canaries, rollbacks)

• Experience working in notebooks (e.g., Jupyter, Colab)

• Experience with Python.
  

Other Skills:

• You are familiar with experimentation, monitoring, and incremental value delivery

• You have experience working in an Agile, outcome-driven environment where you experiment, fail and iterate fast

• You have a continuous improvement mindset, challenging the status quo.

• A user-first approach to development, thinking critically about how features will be used in real-world scenarios.

• You are familiar with the T-shape skill development concept and willing to learn adjacent disciplines

• Experience communicating proposals, status updates and solutions to colleagues, team members and collaborators.

• A motivated approach to work.

• A commitment to learning, staying updated on industry trends, and exploring creative solutions while addressing edge cases.

Benefits

Life at Adevinta comes with its perks! Our Adevintans enjoy the following benefits:

• An attractive Base Salary 💸

• Participation in our Short Term Incentive plan (annual bonus) 🏆

• Work From Anywhere: Enjoy up to 20 days a year of working from anywhere! Maybe not from the moon🌛well why not! just make sure you have internet connection! 🌍

• A 24/7 Employee Assistance Program for you and your family, because we care ❤️

• Win together, lose together is one of our key behaviours. At Adevinta you will find a collaborative environment with an opportunity to explore your potential and grow 🌱

On top of these, we also provide a range of locally relevant benefits. Wanna know more? Apply and ask our recruiters! ✨

Adevinta is an equal opportunity employer and we value diversity. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status or disability status.

If you feel like you don’t meet all of the requirements for this role but are interested, please consider applying anyway. Research suggests that women and individuals from underrepresented groups may self-select out of opportunities if they don’t meet 100% of the job requirements. We strongly encourage people from historically excluded groups to apply and look forward to speaking with you.