Senior .NET Engineer (Payment Platform)

About us

We’re building a high-load payment platform that processes thousands of transactions around the clock.

Our engineering challenges go far beyond typical CRUD applications. We build distributed systems where reliability, scalability, performance, and fault tolerance are critical. Our platform is built around an event-driven architecture using .NET 9, Kafka, PostgreSQL, Redis, Docker, and modern cloud-native engineering practices.

If you’re passionate about designing scalable backend systems and solving complex engineering challenges, we’d love to meet you.

What you’ll do

• Own the architecture of core platform components.
• Design and implement new payment services and provider integrations from concept to production.
• Improve transaction routing, payment processing, and webhook infrastructure.
• Drive architectural decisions for distributed systems.
• Design reliable, scalable, and fault-tolerant backend services.
• Review code, mentor engineers, and promote engineering best practices.
• Collaborate closely with our Connector team (Python / TypeScript).
• Participate in technical roadmap planning and continuous platform evolution.

We’re looking for someone who has
Strong .NET expertise

• 5+ years of commercial backend development.
• Deep knowledge of C# and .NET 8/9.
• Strong experience with ASP.NET Core.
• Excellent understanding of asynchronous programming.
• Experience building highly concurrent backend systems.
• Production experience with Minimal APIs, Hosted Services, Dependency Injection, and background processing.

Distributed Systems

Production experience designing and building systems based on:

• Event-driven architecture
• Microservices
• Idempotency
• Inbox / Outbox pattern
• Reliable message delivery
• Distributed transactions

Apache Kafka

Hands-on production experience with:

• Consumer Groups
• At-least-once delivery
• Manual Offset Commits
• Idempotent Consumers

Databases & Caching

• PostgreSQL
• Dapper
• SQL performance optimization
• Redis / Valkey
• Caching strategies
• Redis Sentinel or Redis Cluster

Infrastructure

• Docker
• Kubernetes or Docker Swarm
• Production deployments
• CI/CD practices

FinTech Experience

Experience with one or more of the following:

• Payment platforms
• PayIn / PayOut flows
• Webhooks & callbacks
• Payment routing
• Cascade retry
• HMAC signatures
• Replay attack protection
• PCI DSS

Engineering mindset

You care deeply about software quality, reliability, and maintainability.

You regularly work with:

• Unit & Integration Testing
• Structured Logging
• Metrics
• Distributed Tracing
• Observability

You are comfortable driving technical initiatives independently from design through production.

AI-assisted Development

AI is an essential part of our engineering workflow.

We expect engineers to confidently use Cursor, Claude Code, GitHub Copilot, or similar tools while maintaining full ownership of the final implementation.

Nice to have

• Lua / LuaJIT
• OpenAPI-first Development
• openapi-generator
• Python or TypeScript
• Git Submodules
• Dynamic configuration through event buses

Tech Stack

.NET 9 • ASP.NET Core • Kafka • PostgreSQL • Redis • Dapper • Docker • Event-driven Architecture • Microservices • OpenAPI • AI-assisted Development

Why join us?

You’ll help shape the architecture of a modern payment platform where engineering decisions have a direct business impact.

You’ll work alongside experienced engineers, solve challenging distributed systems problems, and build technology that processes real financial transactions every day.