Senior Back-end Developer

Multisynaptech
NL - Rotterdam
May 21, 2025

About the role

Multisynaptech is looking for a Senior Backend Developer to help us build a brand new web-based platform from scratch.

You will take technical ownership of our backend services running in a cloud-native .NET Core ecosystem, supporting a modern microservices API for our frontend (and partners).

This is a unique opportunity to shape the product architecture, influence technology choices, and lay the foundation for a scalable, secure, and high-quality product.

If you're a hands-on developer with strong decision-making capabilities and a passion for clean, maintainable systems - let's talk.

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What you'll do

Design and develop a modern, scalable backend application using C# on .NET Core, serving microservices to a Vue.js frontend.
Work closely with the Tech Lead on key design and architecture decisions - your input is essential, not optional.
Collaborate in a multidisciplinary team including frontend and fullstack engineers.
Build secure APIs, integrate databases (SQL and NoSQL), and select appropriate communication protocols (e.g., gRPC, RabbitMQ).
Ensure the system meets healthcare-grade security, performance, and scalability requirements, aligning with relevant certifications (ISO 27001, NEN 7510, HIPAA).

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Who you are

5+ years of professional experience as a senior backend or fullstack developer with a focus on backend.
Proven track record of taking ownership of software products and technical architecture from the ground up.
Strong focus on backend development, with the ability to support frontend work when needed.
Deep knowledge of C# and .NET Core.
Experienced with cloud platforms (preferably Azure) and containerization (Docker).
Confident in mentoring others and making critical technical decisions.
Strong communicator with a collaborative mindset.
Based in the Netherlands (we're located in the Rotterdam area)

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Nice to have:

Experience with SaaS platforms or multi-tenant systems.
Interest or experience with Go or Rust.
Familiarity with testing frameworks (e.g., Jest, Cypress).
Knowledge of security best practices and performance optimization.
Prior experience in agile or startup environments.

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What we offer

A unique opportunity to build a new product from the ground up.
A flexible, work culture with autonomy and trust.
A motivated and driven team that values innovation, clean code, and ownership.
Competitive compensation with the option for performance-based bonuses or equity participation.

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Interested?

Send your CV, e-mail: ***

Let's discuss how you can help us build something impactful at Multisynaptech.

Read the full job description and apply online on the recuiter's web-site

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