vacatures in Assendelft

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Senior developer

Timewax delivers resource planning software to rapidly evolving service organisations. We are looking for an experienced developer that wants to join our team to help scale and further innovate our platform.

Illustration of person sitting behind a Macbook

About the job

You will be writing code, safeguarding best practices and will have an essential role in designing our new architecture with the rest of the technical team. These are a few examples of exciting projects you can work on:

• Building a chatbot as a new user interface to interact with our application
• Implementing AI beyond just LLMs: using solver engines to make planning recommendations
• Improve our data model and queries to improve performance and scalability

There are also a lot of other cool things to work on depending on your background and interests, ranging from front-end work with React and TypeScript to DevOps engineering on our Kubernetes platform or backend development in Kotlin.

It's a joy

"I like that Timewax gives me the space to develop myself. The planning software is a great and challenging product to work on. I definitely feel I'm in the right place here at Timewax. "

Benny van der Bijl

SOFTWARE DEVELOPER

The work environment

We are a customer-oriented club and like to provide simple solutions. We are honest with each other and with the customer. If we are unable or unwilling to deliver something, we will say so. We like to act quickly and, above all, to do. Our working environment is further characterized by:

• You get a brand new Macbook
• We work with Google Workspace, Slack, JIRA and Pipedrive, among others
• We work with the OKR method for setting quarterly goals
• Daily standups and weekly meetings to discuss progress

If you want to develop yourself in certain areas or if you want to brush up on your knowledge, you can follow some online courses that we will of course pay for.

Our stack

We don't require experience with a specific programming language or tool, but you get bonus points for familiarity with at least some of the tools in our stack, like:

• Kotlin with Spring Boot for backend development
• MySQL, Redis and increasingly also PostgreSQL (e.g., for PGVector) for data storage
• Kafka as a message queue with Debezium for CDC
• Kubernetes on Google Cloud
• Functional programming, domain-driven design & test-driven development

If that interests you, you can also work on other parts of our system, like our front-end codebase or mobile applications.

What we look for in developers

We're especially excited about candidates that have experience with developing applications on top of LLMs and planning optimization using constraint satisfaction programming. For example:

• Experience with Spring AI, Langchain4j or equivalent frameworks for chatbot development
• Exposure to the academic discipline of operations research, specifically constraint satisfaction programming using tools like OptaPlanner, Gurobi or Google OR-Tools

If you are a smart developer with real-world experience and a passion for technology we're confident that you can learn on the job. Other things we are looking for are:

• Being able to communicate effectively in English
• At least 5 years of experience
• A good grasp of best practices (e.g., testing)
• Experience designing and building API's & integrations

If you don't have experience with JVM but know another language (e.g., Haskell, Erlang, Swift, F#, OCaml, TypeScript), that is also acceptable. Things that we will be looking for, but are not a hard requirement as long as you are motivated to learn about them:

• Experience with Kafka and, to a lesser extent, Debezium
• Experience with functional programming and domain-driven design
• Kubernetes as a hosting platform and CI/CD with Gitlab

Your manager

"I enjoy being a support person for the team. That often means removing distractions so you can focus on getting things done. I'm also passionate about technology. I'm looking forward to sparring with you, to learn from you and to facilitate you. "

The team

We do have an office in the Netherlands and this is where the majority of our team is based, but several of us work remotely, including from Portugal and Guatemala.We have a team with:

• Eleven developers in the team with seven different nationalities
• A higher than average percentage of women
• The majority of the developers is fairly experienced
• A (former) comedian working as a full-stack developer