> Markdown version of [/jobs/ext/2315227-sr-back-end-developer](https://www.wearedevelopers.com/jobs/ext/2315227-sr-back-end-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Sr. Back-end Developer - **Company:** The Yuki Company - **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), Program Optimization, Relational Databases, Amazon DynamoDB, Github, Machine Learning, Microsoft SQL Server, Visual Basic .NET (Programming Language), MongoDB, NoSQL, Performance Tuning, Scrum Methodology, Systems Integration, Data Server Interface, Backend, Vue.js, AngularJS, Visma Applications, Api Design, Software Coding, Amazon Simple Queue Service (SQS), Web Api - **Published:** August 6, 2026 - **Apply:** https://nl.indeed.com/viewjob?jk=ff122bffeb4f86dd ## About the Role You are 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 with coaching and mentoring junior developers (e.g., peer reviewing, sharing best practices etc.) * Strong experience with relational database engines (MSSQL); * Experience with API development HTTP, REST and .NET Web API; * Experience in Agile methodologies (Scrum); * Experience with Azure DevOps and/or Github; * Autonomy, analytical mindset, and strong organizational skills. Big plusses if: * 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) ## Description Team AO Ops is responsible for the bedrock of our software: the core accounting domain. The team's mission is to ensure that Yuki'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 is responsible for internal tooling/processes and integration with other Visma solutions. (During the intake conversation, we will explain both team dynamics in detail to see which challenge fits your expertise best!) What you get to do (across both teams) Participate in the entire application lifecycle, focusing on optimizing and refactoring the existing codebases, enhancing the performance of critical applications for maximum speed and scalability, and building readable, maintainable, and performant code using the best software practices. Furthermore, as a senior developer you will be a reference to the team, you will guide junior developers and help implement new features and functionalities into our product (e.g. API's, data interfaces with external parties, etcetera). * Feature Development & Integration: Work on implementing new features, APIs, system integrations, and data interfaces (with external parties or Visma solutions), ensuring they are efficient, robust, and aligned with user/system needs. * Code Optimization: Optimize and refactor existing codebases, focusing on improving performance, readability, and maintainability. * Code Development: Build readable, maintainable, and performant code by applying best software practices and industry standards. * Performance Enhancement: Optimize business-critical applications for maximum speed and scalability under heavy system load. * Mentoring and 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. ## Related Videos - [Navigating the Corporate Jungle: Life as a Developer in a large Company](https://www.wearedevelopers.com/videos/621-navigating-the-corporate-jungle-life-as-a-developer-in-a-large-company) - [Leveraging Real time data in FSIs](https://www.wearedevelopers.com/videos/806-leveraging-real-time-data-in-fsis) - [Lessons learned from building a thriving Vue.js SaaS application](https://www.wearedevelopers.com/videos/1666-lessons-learned-from-building-a-thriving-vue-js-saas-application) - [Innovating Developer Tools with AI: Insights from GitHub Next](https://www.wearedevelopers.com/videos/1268-innovating-developer-tools-with-ai-insights-from-github-next) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [NoSQL Data Modeling for Front-end Developers](https://www.wearedevelopers.com/videos/297-nosql-data-modeling-for-front-end-developers) ## Related Articles - [Software Developer Salary in The Netherlands [2023]](https://www.wearedevelopers.com/magazine/217-software-developer-salary-in-the-netherlands-2023) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [Backend Developer Salary in Germany [2023]](https://www.wearedevelopers.com/magazine/196-backend-developer-salary-in-germany-2023) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [The Netherlands – Europe’s powerhouse for software development?](https://www.wearedevelopers.com/magazine/31-the-netherlands-europe-s-powerhouse-for-software-development) - [How to Find Tech Jobs in Amsterdam](https://www.wearedevelopers.com/magazine/279-how-to-find-tech-jobs-in-amsterdam)