Senior Software Engineer, Platform Engineering

New York Cityfull timeOn Site

senior

$200k–$400k

H1B: no

Decagon The Senior Software Engineer, Platform Engineering at Decagon builds and evolves the internal developer platform, focusing on CI/CD, release automation, observability standards, platform tooling, and developer workflows. The role aims to improve developer productivity by reducing build times, eliminating flaky tests, and creating paved roads for service creation and deployment.

Responsibilities

We’re looking for a Senior Software Engineer to help build and evolve our internal developer platform—everything from CI/CD and release automation to observability standards, platform tooling, and developer workflows that remove friction.
This role is for someone who loves making other engineers faster: reducing build times, eliminating flaky tests, creating paved roads for service creation/deployment, and raising the bar on operability by default. Roles like this often combine “builder” energy with strong empathy for how engineers actually work.
Developer productivity & platform tooling
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.
CI/CD & release engineering
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.
Observability & operational excellence
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.

Qualification

4+ years building production softwareEven better if you haveExperience building internal platformsInfrastructure-as-code experience (e

Required

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.
Even better if you have
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.