{"id":3773244,"date":"2026-04-28T15:23:58","date_gmt":"2026-04-28T12:23:58","guid":{"rendered":"https:\/\/laura.fi\/vacancies\/company\/senior-full-stack-web-developer\/senior-full-stack-web-developer\/"},"modified":"2026-05-22T17:36:08","modified_gmt":"2026-05-22T14:36:08","slug":"3773244","status":"publish","type":"job_listing","link":"https:\/\/laura.fi\/en\/vacancies\/advaun-oy\/senior-full-stack-web-developer-c-rest-api-docker\/3773244\/","title":{"rendered":"Senior Full-Stack Web Developer (C#, Rest API, Docker)"},"content":{"rendered":"

Backend REST API Developer C# ASP.NET
\nShape the Future of IT with Advaun
\nAdvaun Oy builds software that helps businesses run better.
\nWe develop web applications, AI systems, healthcare and industrial software, and our own AI-powered ERP\/MES platform for manufacturers.
\nWe are looking for a Full-Stack \/ Backend Developer with strong C# and ASP.NET experience to join our team in Helsinki\/Espoo.
\nThe role focuses on building a REST API with C# and ASP.NET to interface with a legacy application database and support integrations with third-party products.
\nResponsibilities
\nDesign, build, and maintain REST APIs using C# and ASP.NET
\nWork with legacy application databases and third-party integrations
\nUse Entity Framework Core with Microsoft SQL Server
\nImplement authentication and authorization with Keycloak and OpenFGA
\nDesign and document APIs with OpenAPI \/ Swagger
\nWrite clean, testable, production-quality code
\nBuild automated tests using MSTest, Reqnroll, and integration testing tools
\nWork with Docker-based development and deployment environments
\nRequirements
\n3+ years of software development experience
\nStrong experience with C# and ASP.NET \/ ASP.NET Core
\nSolid understanding of REST APIs, OpenAPI, and software testing principles
\nExperience with Entity Framework Core and Microsoft SQL Server
\nExperience with Docker
\nIndependent and solution-oriented mindset
\nFluent English
\nLocated in the Helsinki greater region or able to commute daily
\nFull-time on-site work in Helsinki\/Espoo, minimum 4 days per week
\nPlease note: we are not able to offer relocation packages or visa support
\nTech Stack
\nCore: C#, ASP.NET \/ ASP.NET Core
\nData: Entity Framework Core, Microsoft SQL Server, PostgreSQL
\nAuth: Keycloak, OpenID Connect, OpenFGA
\nAPI: REST APIs, OpenAPI \/ Swagger
\nTesting: MSTest, Reqnroll, Microsoft.AspNetCore.Mvc.Testing
\nDevOps: Docker, Kubernetes, Azure DevOps, GitHub Actions, Azure Container Registry
\nNice to Have
\nKnowledge of HL7 FHIR
\nExperience in healthcare software development
\nExperience with legacy systems or database integration
\nWhat We Offer
\nA key role in a growing startup
\nWork on real healthcare, industrial, AI, and ERP\/MES software
\nModern technical environment
\nSupportive team culture
\nOffice in Helsinki\/Espoo
\nWeekly yoga, Monday breakfast, 24\/7 gym, and team events
\nApply
\nSend your CV and salary expectations here:
\nhttps:\/\/forms.gle\/Svjd4TwrRKDuSYAA8
\nRecommended: GitHub or coding sample, LinkedIn profile, or personal website
\nWe review applications on a rolling basis and may fill the position before the deadline.
\n<\/p>\n

\n
Employment relationship:<\/span>Commission <\/span><\/div>\n
Wage:<\/span>Other By agreement according to salary expectation.<\/span><\/div>\n
Working time:<\/span>Daytime work<\/span><\/div>\n
Number of positions:<\/span>1<\/span><\/div>\n
Notes for applying:<\/span>Send your CV and salary expectations to link.<\/span><\/div>\n
Source: Job Market Finland\/Ty\u00f6markkinatori<\/div>\n<\/div>\n","protected":false},"author":0,"featured_media":0,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"_company_tagline":"","_company_website":"","_company_twitter":"","_company_video":"","_filled":0,"_featured":0,"_remote_position":0,"_job_salary":"","_job_salary_currency":"","_job_salary_unit":""},"job_listing_region":[837,29],"job-categories":[1524,821],"job-types":[1100],"job_listing_tag":[1150],"class_list":{"0":"post-3773244","1":"job_listing","2":"type-job_listing","3":"status-publish","4":"hentry","5":"job_listing_region-helsinki-metropolitan-area","6":"job_listing_region-uusimaa","9":"job_listing_type-contract","10":"job_listing_tag-it-data-communications","13":"job_listing_company-advaun-oy","14":"job_source-tyomarkkinatori","15":"worktime-full-time","17":"job-type-contract"},"acf":[],"yoast_head":"\nSenior Full-Stack Web Developer (C#, Rest API, Docker) - Laura.fi<\/title>\n<meta name=\"description\" content=\"Backend REST API Developer C# ASP.NET Shape the Future of IT with Advaun Advaun Oy builds software that helps businesses run better. 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