Senior Software Engineer, Platform Engineering

Decagon•San Francisco, CA

3d•$200,000 - $400,000•Onsite

About The Position

Decagon is seeking a Senior Software Engineer to join the Infrastructure team. This role focuses on building and evolving our internal developer platform, encompassing CI/CD, release automation, observability standards, platform tooling, and developer workflows. The ideal candidate will be passionate about enhancing developer productivity by reducing build times, eliminating flaky tests, creating streamlined service creation/deployment processes, and improving operability. This position requires a blend of building capabilities and understanding the practical needs of engineers.

Requirements

4+ years building production software, with meaningful experience in platform / devtools / infrastructure (or adjacent SRE/release engineering).
Strong coding ability in at least one systems/productivity language (e.g., Python, TypeScript/JS), and comfort building developer-facing tooling (CLIs, libraries, automation).
Hands-on experience with CI/CD systems and designing pipelines that are scalable and reusable across many repos/services.
Practical experience with observability in production systems (instrumentation, alerting, dashboards, incident response).
Comfort with containers and modern cloud infrastructure (e.g., Docker/Kubernetes and related tooling).
A track record of improving developer experience through measurable outcomes (faster builds, fewer flakes, safer deploys, fewer incidents).
Strong cross-team collaboration and communication—especially writing clear docs and driving adoption.

Nice To Haves

Experience with monorepos and build systems and/or large-scale CI performance work.
Experience building internal platforms: service templates, paved-road deployment, self-serve environments, developer portals.
Infrastructure-as-code experience (e.g., Terraform) and a security-minded approach to supply chain (provenance, secrets, least privilege).
Experience applying AI-assisted tooling to make engineers dramatically more effective.

Responsibilities

Identify workflow bottlenecks (build/test/release/local dev) and build tools that measurably reduce toil.
Create and maintain “golden paths” like service templates, CLIs, libraries, and automation that teams rely on.
Design reusable CI pipelines and deployment workflows that are fast, safe, and easy to adopt across teams.
Improve reliability of builds and tests (flake reduction, hermeticity, caching) and drive down cycle time.
Support progressive delivery patterns (canary / blue-green) and safe rollback mechanisms.
Establish shared observability primitives (metrics/logs/traces), standards, and libraries so services are production-ready by default.
Partner with product engineers to improve operability: SLOs, alerting hygiene, dashboards, incident learnings.
Build and improve core platform capabilities that make it easy to run and scale services.
Own the systems you build end-to-end and help keep them healthy in production, improving reliability over time.