• 5+ years experience in C#/.NET Core
• Strong knowledge of ServiceStack, MassTransit, and Marten
• Experience with REST API development & optimization
• Familiarity with JSON serialization & API authentication (OAuth, JWT)

• Experience with Npgsql driver & PostgreSQL
• Knowledge of query optimization, indexing, and transactions
• Experience implementing Row-Level Security (RLS)
• Familiarity with database migration tools (Flyway, Liquibase, or EF Core Migrations)

• Experience upgrading third-party libraries while maintaining system stability
• Knowledge of Marten event sourcing and state machines
• Ability to identify and resolve compatibility issues when upgrading dependencies

• Strong debugging skills in Visual Studio, Rider, or VS Code
• Familiarity with unit testing frameworks (xUnit, NUnit)
• Experience with Git version control & CI/CD pipelines (Azure DevOps, GitHub Actions, or GitLab CI)

• Ability to optimize API performance and database queries
• Familiarity with caching mechanisms (Redis, MemoryCache)
• Understanding of security best practices for API & database connections

• Experience with PgBouncer for connection pooling
• Familiarity with event-driven architectures & message brokers (RabbitMQ, Kafka)
• Previous experience working in multi-tenant SaaS applications

The candidate will:Work with our internal engineer to resolve upgrade blockers.

Assist in migrating ServiceStack, MassTransit, Marten, and Npgsql dependencies.

Optimize PostgreSQL queries & API interactions for stability and performance.

Debug and fix compatibility issues introduced by dependency upgrades.

Ensure automated testing & CI/CD pipelines remain stable after changes.

Please refer to job description.