- Software Development
- Rotterdam
Sr. Back-end Developer
Your 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.
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 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 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 Yuki 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
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.
Solliciteer direct
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01
Apply
Apply now! We will contact you as soon as possible.
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02
Get to know us
Meet us through our Talent Acquisition Team.
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03
First interview
Take a deep dive with the Tech Lead and SDM.
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04
Technical interview
Prepare a take-home assessment and discuss your answers with our Technical team.
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05
In-office interview
Meet our People & Culture Manager and Software Development Manager.
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Offer
If we see a match — you'll receive an offer!
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