Staff Software Engineer - JavaScript SDK

About the Job:

As a Staff Software Engineer on LaunchDarkly’s SDK team, you will serve as a technical leader, driving the evolution and excellence of the SDKs that form the core of our customers' daily interactions with our products. You’ll work across a diverse array of technologies spanning our 20+ SDKs, providing expertise to ensure these SDKs deliver exceptional performance, resiliency, and reliability.

When working on our SDKs, you’ll be contributing to much more than thin client wrappers. Our SDKs are feature-rich agents designed with strong emphases on performance, concurrency, and resiliency, all while adhering to idiomatic practices for their respective tech stacks. By joining our team, you will shape the SDKs that power trillions of feature flags daily for our customers worldwide, driving meaningful outcomes for their businesses and users.

Responsibilities:

• Lead the design, development, and release of LaunchDarkly’s JavaScript SDKs (e.g., Node Server, React) other supported platforms
• Serve as a technical authority on JavaScript SDK development, mentoring team members and setting coding and design standards.
• Architect SDKs to prioritize developer experience and align with modern JavaScript trends while ensuring compatibility and usability for both front-end and back-end ecosystems.
• Establish and enforce rigorous testing, benchmarking, and quality assurance practices, ensuring SDKs meet stringent performance and reliability criteria.
• Collaborate with engineering and product teams to translate complex requirements into practical and elegant SDK features.
• Actively maintain and contribute to our open-source repositories.
• Identify and implement improvements in architecture, tooling, and processes to enhance SDK performance and maintainability.
• Stay at the forefront of technology trends, leveraging your deep expertise to advocate for and implement innovative solutions.

Qualifications:

• 5+ years of experience (or equivalent) developing high-performance libraries, SDKs, or developer tools in JavaScript, with a focus on delivering production-grade, maintainable code.
• Advanced knowledge of JavaScript, TypeScript, and related ecosystems, with experience in both front-end and back-end frameworks.
• Polyglot background— fluent in JavaScript, TypeScript, and at least one other language, with the ability to context switch between languages quickly.
• Strong foundation in computer science principles, including algorithms, data structures, and software design patterns.
• Excellent communication skills with the ability to work across teams and advocate for technical solutions.
• Self‐starter and problem solver, willing to solve hard problems and work independently when necessary
• 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

About LaunchDarkly:

Modern software delivery was supposed to be the foundation for a thriving digital business but reality has proven otherwise. Slow, inefficient development cycles, costly outages, and fragmented customer experiences are preventing developers from building their best software. The LaunchDarkly platform helps developers innovate on new features faster while protecting them with a safety valve to instantly rewind when things go wrong. Developers can target product experiences to any customer segment and maximize the business impact of every feature. And by gradually rolling out new application components, they escape nightmare "big-bang" technology migrations. 

The LaunchDarkly platform was built to guide engineers to the next frontier of DevOps by:

• Improving the velocity and stability of software releases, without the fear of end customer outages
• Delivering targeted experiences by easily personalizing features to customer cohorts
• Maximizing the business impact of every feature through the ability to experiment and optimize
• Coordinating the release and optimization of software to provide consistent experiences across mobile platforms and device types
• Improving the effectiveness and productivity of engineering teams, by providing insights into engineering cadence and stability

At LaunchDarkly, we believe in the power of teams. We're building a team that is humble, open, collaborative, respectful and kind. We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, gender identity, sexual orientation, age, marital status, veteran status, or disability status. LD invites any applicant to review our written Affirmative Action Plan. To do so, contact People Ops at [email protected].

Learn more about the interview process & what it’s like to work with LaunchDarkly's Product Delivery team!

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