Back End Developer

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Back End Developer

You  develop algorithm's and design architecture for planning and mobility optimisation


Hi there! We are Calendar42, thought leaders in the field of planning and mobility.

We plan.


Always the best match. Data driven, real-time, smart and logical.

What we do

At Calendar42 we develop algorithms for planning and mobility optimisation. This translates into a diversity of services that among other improve travel information, optimise trip planning for field organisations and simplify matchmaking of skilled workers.

The C42 platform enables organisations to continuously improve their (logistic) value chain by applying advanced algorithms to business processes that contain any form of planning. Our platform is actually the back-end of the back-end of our clients. At the same time, due to the versatility of our team, we are a full service partner that creates, develops and rolls out end-to-end solutions.

We are active in various business markets including construction, temporary staffing industry, healthcare, public transportation, events and festivals industry, government, delivery services, insurance and financial services.

We thank our knowledge and results to an international team of highly skilled professionals. These people are part of an ambitious, inquisitive and curious team in a growing organisation. Our team currently exists out of 25 developers, UX designers and operational support staff.

Our workplace

We work in an inspiring open office in Delft, nearby the city centre. Our open and ambitious culture is endorsed by several aspects that we have incorporated in our work habits, like:

  • Daily healthy lunch with the team
  • Weekly team meetings
  • Monthly team meeting with input from all teams
  • Quarterly team building activities or outings
  • Regular afterwork drinks and activities
  • Office masseuse
  • Yoga class

Your mission

We are looking for a Back End Developer who can supplement our team by unravelling huge data sets, designing the architecture, implementing the latest cutting edge technologies and guarding long term technical goals, so he or she can contribute to our ultimate goal: making lives easier by (un)planning the future. You will be joining the Tech team, working closely with your team members. Together you're enabling the company to amaze the world with a business changing platform.

Key responsibilities

  • Design architecture and develop complex solutions
  • Define REST API's
  • Translate requirements from design team to functional solutions
  • Interact with our multidisciplinary team existing of developers, service designers, product owners and project managers
  • Review, design and implement work by your colleague developers

Experience & knowledge

  • Programming experience in Python, experience in other languages is a bonus
  • Experience with REST API's and microservices in a complex environment
  • Understanding of different storage systems such as RDBMS or NOSQL
  • Relevant experience with designing microservice based software
  • Familiarity with Django, Docker, PostGIS, Github
  • You are a problem solver by nature and and are determined to find solutions
  • Self-starter and capable of managing your own work
  • Strong verbal and written communication skills in English (the universal language of C42 is English). 

Acquisition regarding this vacancy is not appreciated.