Senior Backend Engineer - Remote (EU) | .NET & Data APIs

PeopleForce; Polska; Remote; PLN 306,000 - 481,000; Part time

Benefits offered by this job

Remote work in EU time zones

Competitive B2B contract

Growth opportunities in a fast-paced #

Impactful projects in ETF data

Innovation culture

European team events

Job summary

ETFBOOK is a Swiss SaaS company delivering data analytics and APIs for ETFs, with a fully remote Europe-wide team and monthly visits to Cracow. We seek a Senior Backend Software Developer to strengthen our backend platform and data-processing components, driving scalable, secure solutions.

You will design architectures, develop .NET services, and mentor junior engineers while collaborating with Product, Data, and Technology teams to deliver high-quality outcomes.

Qualifications

• 8+ years in software development with strong .NET/C#.
• Backend services, APIs and data processing experience.
• Strong architecture and database design knowledge.
• SQL skills and DB optimization experience.
• Scalable, secure, reliable backend solutions.
• Automated testing and deployment experience.
• Experience with AI-assisted development tools.
• Good knowledge of Azure.
• Strong English communication.
• Mentoring junior/mid-level engineers and code review.

Responsibilities

• Design and optimize application architecture and database schemas.
• Develop and maintain .NET services, APIs, and data-processing components.
• Participate in solution design and requirements analysis for major initiatives.
• Ensure backend performance, security, and reliability.
• Review backend code and promote engineering standards.
• Troubleshoot complex production and system issues.
• Mentor junior and mid-level backend engineers.

Skills

.NET/C# expertise

APIs

Backend design

SQL & DB optimization

Azure

Automated testing

CI/CD

AI-assisted tooling

English communication

Mentoring juniors

Code review

Security & reliability

Job description

ETFBOOK is a Swiss SaaS company delivering data analytics and APIs for ETFs, with a fully remote Europe-wide team and monthly visits to Cracow. We seek a Senior Backend Software Developer to strengthen our backend platform and data-processing components, driving scalable, secure solutions.

You will design architectures, develop .NET services, and mentor junior engineers while collaborating with Product, Data, and Technology teams to deliver high-quality outcomes.