Senior Software Engineer .NET C# / Angular

Rydoo; Antwerpen; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Competitive package

Upskilling through training andCoching

Hybrid Work Policy

Flexible work environment

Team events

International team

Spectacular onboarding

Job summary

Rydoo is hiring a Senior Software Engineer to join a cross-functional squad. You will design and extend core expense-management systems, implement REST APIs, contribute on frontend features, and help architect several microservices.

You will also write automated tests and set up IaC-driven infrastructure and pipelines. We value several years of backend experience with .NET/C#, Angular knowledge is a plus but we welcome developers eager to strengthen frontend skills.

Qualifications

• Several years of backend development experience.
• Good knowledge of .NET and C#.
• Angular is a plus, with willingness to strengthen frontend skills.
• Knowledge of ORM (EF/NHibernate) and SQL Server or similar.
• Team player with focus on clean, testable code within a cross-functional team.
• Experience optimizing performance and scalability for growing user bases.
• SOA experience using Service Bus is a plus.
• Cloud knowledge (Azure/AWS/GCP) is a plus.
• Agile and DevOps experience is a plus.
• Experience with LLMs is a plus.
• Degree preferred; equivalent experience also valued.

Responsibilities

• Work in a cross-functional squad to shape core product in a scalable way.
• Design and extend systems to make expenses management faster and smarter.
• Bring features into production and monitor performance/maintenance.
• Contribute on front-end features.
• Design and implement REST APIs.
• Help architect multiple microservices.
• Design and write automated tests.
• Set up infrastructure and CI/CD pipelines via IaC.

Skills

Backend development

REST APIs

Frontend development

Unit testing

Performance optimization

Agile

DevOps

LLMs

Education

Degree in computer science or related field

Tools

.NET

C#

Angular

Entity Framework/NHibernate

SQL Server

Service Bus

Azure/AWS/GCP

Job description

At Rydoo, we make expense management simple, so people can focus on the important work, not their receipts. More than one million users trust us to submit, approve, and control expenses faster and smarter.

Semine shares that same mission. Since 2015, the team has been building AI technology that removes the repetitive, time-consuming parts of accounting, helping finance teams work smarter.

In July 2025,Semine joined forces with Rydooto shape the future of financial automation. Together, we’re creating a complete, AI-powered platform that simplifies accounts payable and expense management, helping businesses run simpler, faster and smarter financial operations.

We’re a global team of +200 people who believe great tech should make life easier. If you have big ideas and want to build something that actually helps people, you’ll fit right in.

Rydoo in a snapshot

• Ambitious international team
• 33 nationalities speaking over 15 languages
• 240+ employees across multiple countries
• Easy-to-use spend management app available on iPhone and Android
• Supporting over 10,000+ clients and 1 million+ users worldwide
• 4.6 employer score on Glassdoor
• Hybrid work policy

The Role

At Rydoo, we build smart, simple solutions that help people spend less time on expenses and more on what matters.

As a Senior Software Engineer, you will:

• Work in one of our squads, a cross-functional, autonomous team.
• Shape the core of our product - designing and extending systems that make expense management faster and smarter for thousands of users worldwide.
• Bring valuable features into production and follow up on their performance and maintenance.
• Contribute on front-end features.
• Design and implement REST APIs.
• Help architect several of our microservices.
• Design and write automated tests.
• Setup infrastructure and pipelines via Infrastructure as Code (IaC).

• Several years of experience with backend development.
• Good knowledge of .NET, C#.
• Experience with Angular is a plus, but having the curiosity and willingness to further strengthen your front-end knowledge is also much appreciated.
• Knowledge of Entity Framework (or any ORM like NHibernate) and SQL Server or similar.
• A team player with a passion for writing clean and testable code within a cross-functional team.
• Experience in optimising the performance and scalability of applications to support our ever-growing user base.
• Experience with Service Oriented Architecture using Service Bus to connect everything is a plus.
• Knowledge of Azure Cloud (or AWS, GCP) is a plus.
• Agile and DevOps experience is a plus.
• Experience with LLMs is a plus.
• Ability to stay up-to-date with industry trends, best practices, and emerging technologies to continuously improve our development processes and drive innovation.
• A degree in computer sciences or a related field is preferred, but any equivalent experience is just as valuable.

Next to our amazing team, informal & international company culture and our mission to become the number 1 spend and invoice management platform in Europe, we offer some nice benefits that make working at Rydoo / Semine even more fun:

• A competitive package, including salary and benefits
• Upskilling through training and coaching programs
• Hybrid Work Policy
• Professional freedom and a flexible work environment
• Regular company and team events
• Wonderful international team with more than 33 different nationalities
• Spectacular onboarding program for all new joiners

Why Join Us

At Rydoo / Semine, we celebrate diversity and are committed to creating an inclusive environment for all employees. We value and encourage ongoing learning opportunities and career progression.

LinkedIn: https://www.linkedin.com/company/rydoo

Glassdoor: http://bit.ly/2UujjWJ

Instagram: https://www.instagram.com/wearerydoo/

YouTube: https://www.youtube.com/channel/UCTZYj7vm_ZcsGFL18jWHt_A

Inside Rydoo Blog: https://www.rydoo.com/inside-rydoo/