Senior API Platform Engineer – Remote & Equity Eligible

Cast AI; United States; Remote; USD 82,000 - 113,000; Full time

Benefits offered by this job

Competitive salary

Remote-first global environment

Equity options

Learning budget

Annual hackathon

Job summary

Cast AI is seeking a Senior Software Engineer for the API Platform Team. You will own features end-to-end, from design through production rollout, across the API that delivers our AI services globally. Projects ship in 1–4 weeks and involve collaboration with product and other engineering teams.

The role emphasizes building scalable, observable infrastructure with strong Go/TypeScript skills, cloud and Kubernetes experience, and a startup mindset in a remote-first global team.

Qualifications

• :Production experience with Go or Typescript is strongly preferred; candidates without either should demonstrate strong systems programming skills in a comparable language.
• :Strong debugging, optimization, and performance-tuning skills – including query profiling, index design, and database performance tuning beyond ORM usage.
• :Hands-on experience with cloud platforms (AWS, GCP, or Azure) and Kubernetes is a strong plus
• :Observability tooling (Prometheus, Grafana, OpenTelemetry), CI/CD and DevOps practices experience.
• :Startup mindset: adaptable, proactive, and comfortable with ambiguity.
• :Strong English skills, both verbal and written.
• :You’ve personally driven a complex project end-to-end.

Responsibilities

• Develop with observability in mind, identify bottlenecks and optimize for performance. When p99 latency climbs, you find the cause through query profiles and flame graphs instead of raising the alert threshold.
• Design the datastores and distributed systems behind the inference API, and keep them reliable as usage scales from a solo developer to a large enterprise.
• Build the billing, usage metering, and role-based controls that let users monitor and govern their own consumption. Catch correctness problems where a wrong number costs you trust.

Skills

Go/Typescript

Performance tuning

Cloud platforms

Kubernetes

Observability tooling

CI/CD

DevOps

Startup mindset

English proficiency

End-to-end ownership

Tools

Prometheus

Grafana

OpenTelemetry

Job description

Cast AI is seeking a Senior Software Engineer for the API Platform Team. You will own features end-to-end, from design through production rollout, across the API that delivers our AI services globally. Projects ship in 1–4 weeks and involve collaboration with product and other engineering teams.

The role emphasizes building scalable, observable infrastructure with strong Go/TypeScript skills, cloud and Kubernetes experience, and a startup mindset in a remote-first global team.