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FHIR Backend Developer | .NET

Amsterdam, North Holland, Netherlands · Hybrid

$5k–$6k/mo

Mid level

Position details Amsterdam | Hybrid | 32–40 hours | No Visa Sponsorships! About the role At Firely, we build enterprise-grade software that makes health data more accessible and more useful. Our FHIR server is at the hea…

Skills: .NET, C#, REST APIs, MS SQL Server, MongoDB

Firely logo

FHIR Backend Developer | .NET

Firely

Amsterdam, North Holland, Netherlands • Hybrid

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Mid levelHybrid · 2 days in office

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  • $5k–$6k/mo
  • Full-time, Part-time
  • bachelor degree
  • 27 Holidays, Hybrid Work Option, NS Business Card (1st Class Travel), Bring Your Own Device or Purchase Budget, Home Office Setup Budget, Annual Growth and Development Budget
  • Posted 16d ago
  • ~40 hrs/week

Responsibilities

Design and implement backend features for the Firely FHIR server using .NET and C#. Responsibilities include optimizing database queries, handling health data payloads, and collaborating on architectural decisions.

Requirements

Requires proficiency in .NET/C# backend development, REST APIs, and experience with MS SQL Server or MongoDB. Candidates must be authorized to work in the Netherlands and be fluent in English.

Full job description

Position details

Amsterdam | Hybrid | 32–40 hours | No Visa Sponsorships!

About the role

At Firely, we build enterprise-grade software that makes health data more accessible and more useful. Our FHIR server is at the heart of that work, helping healthcare organizations around the world exchange data more reliably and efficiently.

Yes, it’s technical. But it’s also meaningful. Better health data exchange means better informed care.

To help us push that further, we’re looking for a talented and curious Backend Developer (.NET) to join our development team. This role is for someone who enjoys owning their work, diving into hard problems, and contributing to a standard that’s shaping the future of healthcare.

You’ll work in a small, collaborative team alongside a product owner, lead developer/architect, and fellow engineers. You’ll have real autonomy over your technical scope and senior colleagues to think alongside when the problems get complex.

What you’ll be doing

You’ll contribute to the development and improvement of Firely Server, our flagship FHIR server product. That means building new features, improving performance, and helping shape the technical direction of what we ship.

In this role, you will:

  • Design and implement backend features in .NET / C#
  • Work with REST APIs to enable reliable health data exchange
  • Write and optimize queries across MS SQL Server and/or MongoDB; including indexing strategies and schema design for healthcare data
  • Handle and validate JSON/XML payloads in line with FHIR specifications
  • Contribute to code reviews, technical discussions, and architectural decisions
  • Use AI tools to support development, planning, and quality assurance
  • Collaborate with colleagues and, where relevant, engage with the wider FHIR community

Who we think will thrive here

You’re someone who takes ownership, asks good questions, and cares about the quality of what you ship. You’re energized by technically challenging work, comfortable with ambiguity, and not put off by a spirited debate in the FHIR community.

Required

  • Proficiency in .NET / C# backend development
  • Solid understanding of REST APIs and how to work with them effectively
  • Database experience with MS SQL Server and/or MongoDB
  • Experience withAWSor Azure
  • Experience handling JSON/XML payloads, including validation and storage
  • Experience using AI tools to support development, planning, and quality assurance
  • Familiarity with Git and tools like Jira, GitHub Projects
  • Already authorized to work in the Netherlands
  • Fluent English (written and spoken)

Nice to have

  • A bachelor’s degree in computer science or equivalent working level
  • At least 2 years of .NET / C# backend development experience
  • Knowledge of HL7 and/or FHIR
  • Familiarity with additional data stores such as PostgreSQL or cloud-native databases (e.g.Azure Cosmos DB, AWS RDS)
  • A background in or curiosity about the healthcare sector

What you’ll get from us

We want this to be a place where you can do great work, keep growing, and feel genuinely trusted with things that matter. You can expect:

  • Real ownership of your work, with support from experienced colleagues
  • Plenty of room to develop your skills across a technically rich stack
  • Active involvement in hackathons and international FHIR working group meetings
  • A salary between €5,000 and €6,000 gross per month based on a 40-hour workweek
  • 27 holidays based on a 40-hour work week
  • A hybrid role (with 2 days in the office), full-time or 4 days — you choose
  • NS Business Card to travel 1st class to work
  • Bring your own device or budget to purchase a new one
  • Budget to set-up your home office
  • Annual budget to support your growth and development
  • A cozy office in the heart of Amsterdam with a canal view

    Questions about this role? Reach out to our HR & Recruitment team at [email protected]

About us

Be part of the revolution in Health Informatics!

Firely is a digital healthcare scale-up. We specialize in software and services in healthcare and research. The company is one of the initiators of HL7 FHIR (pronounced “fire”), a new international standard for information exchange in healthcare. By making health data more accessible, Firely helps developers worldwide build apps that ultimately benefit patients. Our customers are healthtech vendors, care providers, payers/insurance companies, governments, and health agencies in Europe and the US.

Firely is a group of software engineers, support engineers, FHIR consultants, and a commercial team. Our head office is based in Amsterdam (the Netherlands), our international team works from Europe and the US.

An important part of our activities is the involvement in the development of both the FHIR standard itself and FHIR tooling and open-source libraries. Besides that, we are the organizers of FHIR DevDays, and founding member of the FHIR Business Alliance (FHIRBall). We live and breathe FHIR, we talk FHIR to our computers, our colleagues, and even our friends which … frankly … drives them crazy! Working with Firely means working with FHIR, building software, and doing consultancy in an international team. It means FHIR DevDays. It means being part of the FHIR revolution. If you have the curiosity, passion, and collaborative spirit, work with us, and let's fire it up together!

Apply by clicking on the 'apply for this position' button below. Please make sure you send us your CV and a motivation letter.


Our Commitment to Equality

Firely is proud to be an equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, Veteran Status, or any other characteristic protected by law.


Related keywords

FHIRHL7Health InformaticsBackend EngineeringC#.NETRESTful APIsMS SQL ServerMongoDBAWSAzureJSONXMLGitJiraGitHub

About Firely

LinkedInVisit site

Firely provides all the software, training and services you need to bring FHIR to life. We also run HL7 FHIR DevDays.

Industry
IT Services and IT Consulting
Company size
11-50 employees
Founded
2015
Headquarters
Amsterdam, North Holland
LinkedIn followers
4,022

Firely is a global digital healthcare company that provides all the software, training, and consultancy you need to bring FHIR to life. As one of the initiators of FHIR, Firely has been involved since the beginning and plays a prominent role in the evolution of the standard. Firely’s 100% FHIR-based solutions —Firely Server, Simplifier.net, and the official open-source .NET SDK for HL7 FHIR—are trusted by governments, hospitals, and health IT companies around the world to simplify compliance and interoperability. Dedicated to the worldwide adoption of FHIR, Firely takes a leading role in the FHIR community as a founding member of the FHIR Business Alliance and the driving force behind HL7 FHIR DevDays – the world’s foremost FHIR event.

Offices: Westerdok 442, Amsterdam, North Holland 1013 BH, NL · 228 E 45th St, Suite 9E, New York, NY 10017, US

FHIR Consultancy and TrainingFHIR Software and ServicesFHIR DevDaysInteroperabilityFHIRCMS complianceONC complianceISiK complianceMedMij complianceFHIR Server
View all jobs at Firely

About Firely

LinkedInVisit site

Firely provides all the software, training and services you need to bring FHIR to life. We also run HL7 FHIR DevDays.

Industry
IT Services and IT Consulting
Company size
11-50 employees
Founded
2015
Headquarters
Amsterdam, North Holland
LinkedIn followers
4,022

Firely is a global digital healthcare company that provides all the software, training, and consultancy you need to bring FHIR to life. As one of the initiators of FHIR, Firely has been involved since the beginning and plays a prominent role in the evolution of the standard. Firely’s 100% FHIR-based solutions —Firely Server, Simplifier.net, and the official open-source .NET SDK for HL7 FHIR—are trusted by governments, hospitals, and health IT companies around the world to simplify compliance and interoperability. Dedicated to the worldwide adoption of FHIR, Firely takes a leading role in the FHIR community as a founding member of the FHIR Business Alliance and the driving force behind HL7 FHIR DevDays – the world’s foremost FHIR event.

Offices: Westerdok 442, Amsterdam, North Holland 1013 BH, NL · 228 E 45th St, Suite 9E, New York, NY 10017, US

FHIR Consultancy and TrainingFHIR Software and ServicesFHIR DevDaysInteroperabilityFHIRCMS complianceONC complianceISiK complianceMedMij complianceFHIR Server
View all jobs at Firely

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