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Salary: USD 145,500 - 235,400 / annual
LaunchDarkly is seeking a Backend Software Engineer to join the SDK team. You will build and maintain the primary touchpoint that customers interact with daily—feature-rich SDKs that handle trillions of feature flag evaluations each day across 35+ supported platforms. The role focuses on developing SDKs with strong emphasis on performance, concurrency, and resiliency while following idiomatic practices for each technology stack.
You will contribute to development across multiple programming languages and platforms, implementing new features and improvements to meet customer performance and resiliency requirements. You'll collaborate with engineering and product teams to drive implementation and release of major features, actively maintain open-source repositories, identify areas for improvement, and advocate for best practices. You'll have an active voice in shaping both technology and product decisions.
The SDK team is spread across Eastern and Pacific time zones, with opportunities to visit the Bay Area office for team offsites. Your work will be publicly visible as LaunchDarkly develops its open-source SDKs in public. You'll work with highly experienced engineers and have opportunities to learn multiple programming languages and frameworks while influencing roadmap and prioritization.
REQUIREMENTS:
- Demonstrable experience building libraries and packages used by other developers
- Polyglot background with ability to context switch between languages quickly
- 5+ years of experience with at least two of: .NET, Go, Ruby, Python, NodeJS, Java
- Strong computer science fundamentals
- Strong testing background: experience building unit, integration, load tests, and benchmarks
- Experience writing production-ready code with emphasis on quality and maintainability
- Experience contributing to open-source software
- Committed to working in a communicative, collaborative environment
- Self-starter and problem solver, willing to solve difficult problems and work independently
PLUS (preferred):
- Experience with C++, Erlang, Haskell, or Lua
- AI SDKs experience
- Observability SDKs experience
- Mobile development experience
