Senior .NET Developer (Fintech) — Remote, AI-Driven Backend

Dating Group; Poland; Remote; PLN 308,000 - 485,000; Full time

Benefits offered by this job

27 paid days per year

Paid sick leave

Bonuses for referrals

Learning support

Wellbeing Wallet €2,800/year

Home office budget €1,000

Child support benefit up to €1,000 per

Job summary

Social Discovery Group is seeking a Senior .NET Developer (Fintech) to build and maintain backend services for payment processing and back-office operations. You will design microservices, integrate with Azure, Docker, AKS, MS SQL Server, MongoDB and Cosmos DB, and deliver tasks with AI tools, ensuring code is well-tested and maintainable.

You will join an international, remote-friendly team focusing on scalable fintech solutions, with opportunities for leadership and mentoring as part of a

Qualifications

• 5+ years of commercial experience with C# and ASP.NET Core.
• Experience designing microservices.
• Hands-on experience with Azure, Docker, AKS, MS SQL Server, MongoDB and Cosmos DB.
• Real experience delivering tasks with AI tools or agents; able to explain every line shipped.
• Clean, maintainable code with tests.
• Ownership of results and open communication when something goes wrong.

Responsibilities

• Develop and maintain backend services for payment processing and the back office: reconciliation, payouts, fee calculation, settlements and the B2B client dashboard.
• Build resilient integrations and asynchronous workflows (idempotency, outbox/inbox, sagas, retries, deduplication).
• Meet performance and reliability targets (p95/p99 latency, SLA/SLO), set up monitoring and alerting.
• Deliver tasks with AI agents, validate the generated code, add tests and fix defects.
• Review code, keep specifications up to date and share knowledge with the team.

Skills

C# & ASP.NET Core

Microservices design

Azure

Docker

AKS

MS SQL Server

MongoDB

Cosmos DB

AI tools/agents

Tests & TDD

Ownership & communication

Mentoring

Payments/Banking background

Job description

Social Discovery Group is seeking a Senior .NET Developer (Fintech) to build and maintain backend services for payment processing and back-office operations. You will design microservices, integrate with Azure, Docker, AKS, MS SQL Server, MongoDB and Cosmos DB, and deliver tasks with AI tools, ensuring code is well-tested and maintainable.

You will join an international, remote-friendly team focusing on scalable fintech solutions, with opportunities for leadership and mentoring as part of a