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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Sr. Back-end Developer - **Company:** Yuki - **Location:** Rotterdam, Netherlands (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** ASP.NET, JavaScript (Programming Language), .NET Framework, Application Programming Interfaces (APIs), Agile Methodology, Amazon S3, Application Lifecycle Management, Microsoft Azure, C Sharp (Programming Language), Software as a Service, Program Optimization, Code Review, Relational Databases, Amazon DynamoDB, Github, Machine Learning, Microsoft SQL Server, Visual Basic .NET (Programming Language), MongoDB, NoSQL, Performance Tuning, Scrum Methodology, Software Engineering, Systems Integration, Nmbrs, Data Server Interface, Backend, Vue.js, AngularJS, Visma Applications, Api Design, Amazon Simple Queue Service (SQS), Web Api - **Published:** September 1, 2026 - **Apply:** https://www.nationalevacaturebank.nl/vacature/78d2e975-317a-4caf-bda6-ed9d26ca33a6/sr-punt-back-end-developer ## About the Role We are currently hiring two Senior Back-end Developers for two distinct, high-impact teams within our development organization: Team AO Ops and Team Platform ., You're a technical reference point with an autonomous, analytical mindset and strong organizational skills. You care about software craftsmanship, love tackling performance bottlenecks, and enjoy sharing your expertise with the team. + At least 4 years of experience as a back-end developer using .NET technologies (VB.NET/C#). + Experience coaching and mentoring junior developers (e.g. peer reviewing, sharing best practices). + Strong experience with relational database engines (MSSQL), and with API development (HTTP, REST, .NET Web API). + Experience with Agile methodologies (Scrum), and with Azure DevOps and/or GitHub. + An autonomous, analytical mindset and strong organizational skills. Bonus points: + Familiarity with AWS S3/SNS/SQS. + Some experience with JavaScript frameworks (e.g. Vue, Prototype, Angular). + Experience in performance-critical applications. + Familiarity with OCR systems and Machine Learning (ML). + Experience with ASP.NET . + Familiarity with NoSQL databases (e.g. MongoDB, DynamoDB). You don't need to tick every possible box. If you recognise yourself in the role and believe you can make an impact, we'd like to hear from you - let us know in your application (or during the intake) if you have a preference between Team AO Ops and Team Platform, or if you're open to either. ## Description As a senior developer, you participate in the entire application lifecycle - optimizing and refactoring existing codebases, enhancing the performance of critical applications, and building readable, maintainable, and performant code using the best software practices. You're also a technical reference for the team: you guide junior developers and help implement new features and functionality into our product. Team AO Ops Team AO Ops is responsible for the bedrock of our software: the core accounting domain. The team's mission is to ensure Nmbrs Accounting's financial engine remains rock-solid, highly performant, and exceeds our users' expectations every single day. Team Platform Team Platform focuses entirely on system-technical excellence and internal tooling rather than client-facing features - the team owns internal tooling/processes and integration with other Visma solutions. (During the intake conversation, we'll walk you through both team dynamics in detail, so together we can figure out which challenge fits your expertise best.)) In practice, you will: + Feature development & integration: Work on implementing new features, APIs, system integrations, and data interfaces (with external parties or Visma solutions), ensuring they're efficient, robust, and aligned with user/system needs. + Code optimization: Optimize and refactor existing codebases, focusing on improving performance, readability, and maintainability. + Performance enhancement: Optimize business-critical applications for maximum speed and scalability under heavy system load. + Mentoring & coaching: Provide guidance, peer reviews, and support to less experienced team members, helping them improve their technical skills and grow professionally. + Team collaboration: Work closely with cross-functional team members and technical stakeholders, fostering effective communication to achieve project goals. Your impact Your work directly determines how reliable and performant the financial engine at the core of the Nmbrs Accounting module really is. When you optimize a critical application under heavy load, it's the reason thousands of accountants and entrepreneurs can trust their numbers are right, every single day. When you ship a clean integration instead of a brittle one, it's one less production fire for the whole team. You're also raising the bar for the developers around you: as a senior reference point, the code reviews and mentorship you provide shape how the next generation of developers on your team writes and thinks about software. You bring, Department Software Development Role Back-end Developer Locations Rotterdam Remote status Hybrid Sub Category Development Application deadline 01 November, 2026 Competencies Relational Database, Software Development, SaaS, Github, .NET, Azure Devops, C#, Scrum Company The Yuki Company BV join the RIDE Software Development · Rotterdam · Hybrid Sr. Back-end Developer Scale our core accounting engine or build our platform infrastructure: Which impact will you make? 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