Backend engineer - Java / C#

The Role
We're building the financial backbone for a suite of B2B products serving emerging markets. You'll design and implement transaction systems that handle:

• Ledger architectures and multi-currency workflows
• Idempotent transaction processing at scale
• Settlement and reconciliation flows
• External service provider integrations
• Fault tolerance and consistency guarantees across distributed systems
• Security and fraud mitigation patterns

What You'll Do

• Design and implement core transaction processing systems
• Architect transaction workflows with clear state transitions
• Ensure atomicity and consistency across distributed components
• Implement idempotent APIs and retry-safe processing pipelines
• Design reconciliation systems against multiple external providers
• Own performance, observability, and production reliability
• Lead code reviews focused on correctness and long-term maintainability
• Mentor engineers in designing failure-aware systems

What We're Looking For
You have:

• Designed and shipped production-grade financial/transactional systems
• Deep understanding of transactional integrity (ACID, isolation levels, race conditions)
• Experience building ledger-based architectures
• Strong grasp of distributed systems fundamentals
• Experience designing idempotent APIs and webhook consumers
• Practical experience with event-driven systems (Kafka, RabbitMQ, etc.)
• Experience with relational databases (PostgreSQL, SQL Server, MySQL) at scale
• Strong opinions on consistency vs availability trade-offs
• Proven ability to debug production incidents with financial impact

Bonus:

• Experience integrating with African financial services and payment rails
• Knowledge of PCI-DSS, security hardening, and fraud prevention
• Experience with containerization and cloud infrastructure (Docker, Kubernetes, AWS/Azure/GCP)

Tech Stack
Strong production experience with C# (.NET), Java (Spring Boot), or similar in financial/transactional systems.