Backend Software Engineer, SDK

USARemoteFull-time2026-10-20 → 2026-11-10

Hybrid

Core

Design, develop, and maintain SDKs for multiple platforms, focusing on performance, concurrency, resiliency, and quality.

Role type

Senior IC backend software engineer (SDK development)

Builds

Open-source and proprietary SDKs for various programming languages and platforms

Domain

Software development, SDKs, polyglot programming

Required skills

polyglot programming, library/package development, unit/integration/load/benchmark testing, open-source contribution, strong computer science fundamentals

Preferred skills

C++, Erlang, Haskell, Lua, AI SDKs, observability SDKs, mobile development

Technologies

.NET, Go, Ruby, Python, Node.js, Java

Responsibilities

Develop and improve SDKs for supported platforms; Implement features focused on customer performance, concurrency, resiliency, quality, and maintainability; Collaborate with engineering and product teams on major feature implementation and releases; Maintain LaunchDarkly's open-source SDK repositories; Identify improvements, advocate for best practices, and contribute to technology and product decisions

Seniority

Senior, hands-on IC

About LaunchDarkly

Software DevelopmentSeries D646Oakland, CA, USFounded 2014

LaunchDarkly is the runtime control layer for the AI era. For over a decade we have helped engineering teams control what ships in production, starting with feature management and evolving into the infrastructure that governs how software and AI agents behave after deploy. With CodeControl and AgentControl, teams can update agent behavior in milliseconds, automatically roll back when something drifts, and govern every agent and feature across the organization from one place. No redeploys required. LaunchDarkly processes more than 50 trillion flag evaluations per day and serves some of the most