Backend engineer on Twilio's Developer Interfaces team, building SDKs and API infrastructure at scale

Twilio is hiring a Software Engineer (L2) for its Developer Interfaces team, which builds SDKs (Java, C#, Python, Go, PHP, Node.js, Ruby) and CLI tools on top of Twilio's Communications and Engagement Platform. The role requires 2-4 years of backend experience, hands-on IaC/CI-CD (Terraform, Buildkite), and on-call ownership of services handling billions of weekly requests — remote, based in select Indian states.

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What this interview tests

Backend engineering in Python/Java with SDK/CLI generation from OpenAPI specs
Infrastructure as Code with Terraform and CI/CD pipeline ownership (Buildkite)
Operating high-availability microservices at billions-of-requests scale
On-call incident response using Datadog/CloudWatch/Grafana
Service-oriented architecture and REST API design

Common question themes

Designing or extending an SDK/CLI generation pipeline from an OpenAPI spec

Using Terraform to manage infrastructure as code

Building or debugging a CI/CD pipeline and improving deployment reliability

Walking through an on-call incident and root-causing it with monitoring tools

Making a change directly in a production system and mitigating risk

Reasoning about tradeoffs between cloud technologies for a practical, scalable choice

How candidates describe it

Real Software Engineer (L2) interview stories — retold from candidates' public write-ups, with sources.

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