Senior .NET Backend Engineer — Remote

ETFbook; Polska; Remote; PLN 393,000 - 568,000; Part time

Benefits offered by this job

100% remote

Competitive B2B contract

Growth opportunities

Impactful work

Team-building events

Job summary

ETFbook is seeking a Senior Backend Software Developer to join our fully remote European team. You’ll work on cutting-edge .NET services, APIs and data-processing components that power our ETF data analytics platform.

You will design scalable architectures, optimize databases, review code and mentor junior engineers while collaborating with Product, Data and Technology teams to deliver reliable, high-quality solutions in a fast-evolving fintech environment.

Qualifications

• 8+ years of software development with strong .NET/C# experience.
• Experience with backend services, APIs and data processing.
• Knowledge of architecture and database design.
• Strong SQL skills and DB optimization.
• Experience with automated testing and deployment; Azure familiarity.
• Ability to mentor engineers and review code.

Responsibilities

• Designs and optimizes application architecture and database schemas.
• Develops and maintains the latest .NET services, APIs, and data-processing components.
• Participates in solution design and requirements analysis for major initiatives.
• Ensures backend performance, scalability, security, and reliability.
• Reviews backend code and promotes engineering standards.
• Troubleshoots complex production and system issues.
• Mentors junior and mid-level backend engineers.

Skills

C# / .NET

Backend services

APIs

Data processing

Database design

SQL optimization

Testing & CI/CD

Mentoring

English communication

Tools

Azure

Job description

ETFbook is seeking a Senior Backend Software Developer to join our fully remote European team. You’ll work on cutting-edge .NET services, APIs and data-processing components that power our ETF data analytics platform.

You will design scalable architectures, optimize databases, review code and mentor junior engineers while collaborating with Product, Data and Technology teams to deliver reliable, high-quality solutions in a fast-evolving fintech environment.