Backend .NET Engineer - Payments

The Payments Team builds and operates the core services, shared libraries, and infrastructure behind our payment gateway.

We process merchant transactions across multiple payment providers, so our work sits on the critical path for money movement, and reliability, correctness, and observability are not optional.

Our goal is to ship faster, keep the system reliable under transactional load, and raise the engineering bar across the org.

YOUR IMPACT:

• Design, build, and maintain backend services and shared libraries consumed across gateway and integration teams.

• Develop scalable, cloud-native microservices, gRPC/REST APIs, and integrations in C# on .NET 9, orchestrated locally with .NET Aspire.

• Work across our data and messaging stack: PostgreSQL (EF Core), Redis/Valkey for caching, and Kafka for event-driven, asynchronous transaction flows.

• Design resilient, correct message-driven flows using proven microservice patterns — Transactional Outbox/Inbox, exactly-once delivery, idempotent consumers, sagas/process managers for distributed workflows, and event sourcing where it fits.

• Define and implement engineering standards, reusable patterns, and building blocks (configuration, observability, logging, test frameworks) adopted across teams.

• Improve reliability, performance, observability, testability, and maintainability of payment-critical services.

• Strengthen observability across services using OpenTelemetry, Prometheus/Thanos, Loki, and Grafana/Coralogix — including RED metrics, tracing, and health probes.

• Collaborate with product and integration teams to understand their needs and deliver effective, well-abstracted technical solutions.

• Mentor engineers and drive adoption of modern practices, including AI-assisted development.

OUR REQUIREMENTS:

• Strong backend development experience with C# and ASP.NET.

• Experience building distributed systems, microservices, APIs (REST and gRPC), and shared components.

• Understanding of microservice design patterns: Transactional Outbox/Inbox, exactly-once/idempotent message processing, sagas, distributed transactions, retries, and eventual consistency.

• Hands-on experience with relational databases (PostgreSQL/EF Core) and key-value/caching stores (Redis).

• Experience with message brokers and event-driven architecture (Kafka or equivalent).

• Experience working with AI coding agents / AI-assisted development tools.

• Strong grasp of engineering best practices: integration testing, CI/CD, code quality, observability, and reliability.

• Ability to take ownership, drive technical initiatives, and collaborate across multiple engineering teams.

NICE TO HAVE:

• Experience in payments, fintech, or other high-reliability transactional domains.

• Practical knowledge of Docker and Kubernetes; exposure to GitOps (ArgoCD) and infrastructure-as-code (Terraform).

• Experience running services on AWS (EKS, RDS, MSK, ElastiCache, SSM/Secrets Manager).

• Familiarity with .NET Aspire and OpenTelemetry-based observability.

WHAT WE OFFER

• Annual Discretionary Performance Bonus 💷

• Annual Salary Review 💵

• 21 Days of Paid Leave 📢

• Hybrid Model 🏠

• Semi-flexible Working Hours ⌚

• Provident Fund 💰

• Medical Insurance coverage ❤‍🩹

• Sports Benefits App Subsidized Subscription 🏋

• EUR 100 monthly Lunch Allowance with extra EUR 9 per in-office day 😋

• Happy Hour 🤠

• Exciting Career Paths 🎯

• Personalized Learning and Development Programs 📖

• Birthday Leave! 😎

• Marriage Leave Vacation 💍

• Variety of Employee Perks 🎫