Remote Backend Engineer, Flag Delivery Platform

Mosaec; United States; On-site; USD 171,200 - 235,400; Full time

Job summary

LaunchDarkly is seeking a Backend Software Engineer to join the Flag Delivery team. You will build and scale backend services that feed our real‑time delivery paths, working alongside SDK, Platform, SRE, and Security.

This senior‑leaning team emphasizes modernization, resilience, and strong production instincts, with clear AI fluency guiding engineering work. You will collaborate across distributed systems, debugging complex production issues and ensuring low latency, high availability, and

Qualifications

• 5+ years of backend software engineering experience.
• Experience building or operating production backend systems.
• Strong programming skills in Go, Java, Rust, or a similar backend language; today the team primarily uses Go, with some Rust in the broader environment.
• Clear, existing AI usage in engineering work.
• Ability to use AI without surrendering technical judgment.
• Familiarity with distributed systems fundamentals such as caching, concurrency, failure modes, and reliability.
• Experience debugging production issues and using observability to understand system behavior.
• Ability to reason clearly about code, architecture, and system behavior.
• Strong learning orientation and comfort working with senior engineers.
• Strong collaboration and communication skills, with the ability to work well across engineering teams.
• Willingness to participate in on-call and production support.

Responsibilities

• Build, improve, and operate backend services that power LaunchDarkly’s Flag Delivery systems.
• Contribute to systems that support streaming and polling delivery models for LaunchDarkly SDKs.
• Debug production issues, improve service reliability, and help the team maintain strong standards around latency, availability, observability, and operability.
• Work with technologies and patterns common to modern distributed backend systems, including caching layers, network services, concurrency, failure handling, and cloud infrastructure.
• Collaborate closely with partner teams including SDK, Platform, SRE, Security, and Enterprise to deliver improvements across the broader platform.
• Participate in the on-call rotation and take ownership of the systems you help build.
• Learn the existing architecture deeply and make pragmatic improvements that increase system clarity, performance, and maintainability.
• Use AI as part of your engineering workflow with sound judgment, including knowing when to use it, how to direct it effectively, and how to verify or reject its output.
• Reason clearly about code, architecture, and whole-system behavior even when AI is in the loop.

Skills

Go

Rust

Backend software engineering

AI usage in engineering

Distributed systems

Job description

LaunchDarkly is seeking a Backend Software Engineer to join the Flag Delivery team. You will build and scale backend services that feed our real‑time delivery paths, working alongside SDK, Platform, SRE, and Security.

This senior‑leaning team emphasizes modernization, resilience, and strong production instincts, with clear AI fluency guiding engineering work. You will collaborate across distributed systems, debugging complex production issues and ensuring low latency, high availability, and