Senior Backend Engineer — .NET & Data Platform (Remote)

ETFbook; Kraków; Remote; PLN 307,000 - 482,000; Full time

Benefits offered by this job

100% remote work in Europe

Competitive B2B contract

Growth opportunities in a startup

Impactful ETF data product work

Biannual team-building events

Job summary

ETFBOOK is seeking a Senior Backend Software Developer to join our fully remote European team. You’ll design and maintain .NET/C# services, APIs, and data-processing components, ensuring scalability, security, and reliability.

You’ll collaborate with Product, Data, and Technology teams and mentor junior engineers, with monthly in-person collaboration in Cracow. This role offers a competitive B2B contract and a fast-paced startup environment.

Qualifications

• 8+ years of software development experience.
• Extensive experience with backend services, APIs and data processing.
• Strong understanding of architecture and database design.
• Strong SQL and database optimization experience.
• Experience with automated testing and deployment.
• Experience with AI-assisted development tools.
• Good knowledge of Azure.
• Strong communication skills in English.

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, security, and reliability.
• Reviews backend code and promotes engineering standards.
• Troubleshoots complex production and system issues.
• Mentors junior and mid-level backend engineers.

Skills

Problem solving

English communication

Mentoring

Team collaboration

Code review

Tools

Azure

SQL

CI/CD

AI tooling

Job description

ETFBOOK is seeking a Senior Backend Software Developer to join our fully remote European team. You’ll design and maintain .NET/C# services, APIs, and data-processing components, ensuring scalability, security, and reliability.

You’ll collaborate with Product, Data, and Technology teams and mentor junior engineers, with monthly in-person collaboration in Cracow. This role offers a competitive B2B contract and a fast-paced startup environment.