Senior Software Engineer .NET C#

Rydoo; Województwo mazowieckie; Hybrid; PLN 191,245 - 276,242; Full time

Benefits offered by this job

Competitive salary and benefits

€1,000 learning and development budget

Hybrid work policy

International mobility program

Flexible work environment

Training and coaching programs

Regular company events

Diverse international team

Comprehensive onboarding program

Permanent contract

Job summary

A technology solutions company is seeking a Senior Software Engineer to design and implement systems for smarter expense management. This role requires backend development skills, particularly in .NET and C#, along with experience in cloud technologies. The suitable candidate will work collaboratively in a cross-functional team, enhance product features, and ensure application performance. Flexibility in working from home or the Warsaw hub is offered, along with a competitive salary and various benefits.

Qualifications

• Several years of experience with backend development.
• Excellent knowledge of .NET and C#.
• Good knowledge of SQL Server or other similar databases.

Responsibilities

• Work in a cross-functional squad to design and extend systems.
• Implement REST APIs and architect microservices.
• Contribute to front-end features and automate tests.

Skills

.NET, C#

Entity Framework

SQL Server

Angular

Agile methodologies

DevOps

Service-Oriented Architecture

Cloud Technologies (Azure/AWS/GCP)

Education

Degree in computer sciences or related field

Job description

Senior Software Engineer

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

Responsibilities

• 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
• Set up infrastructure and pipelines via Infrastructure as Code (IaC)

Requirements

• Several years of experience with backend development
• Excellent knowledge of .NET, C#
• Good knowledge of Entity Framework (or other ORM like NHibernate), 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
• Some experience with Angular is a plus, but having the curiosity and willingness to learn front‑end technologies is also much appreciated
• 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

Benefits

• A competitive package, including salary and benefits
• €1,000 per year learning and development budget
• Rydoo Hybrid Work Policy: flexibility to work from home while also fostering team collaboration in our Warsaw hub 1x a week
• Rydoo On Tour: international mobility program that gives employees the possibility to temporarily relocate to one of the countries where we have a Rydoo office
• Professional freedom and a flexible work environment
• Upskilling through training and coaching programs
• Regular company and team events
• Wonderful international team with more than 33 different nationalities
• Spectacular onboarding program for all new Rydooer's
• Permanent contract