Build real-time AI agent infrastructure: Design and operate the stateful, low-latency runtime that powers voice and chat AI agents — from LLM streaming and conversation state management to graceful recovery and multi-channel support.
Solve distributed systems problems: Own session management across scaled-out workers — including affinity, checkpointing, crash recovery, and consistency under concurrent access.
Build a function execution platform: Own a serverless-style runtime where customers deploy custom logic — build orchestration, container lifecycle, autoscaling, and versioned rollouts.
Own developer experience and test infrastructure: Build CLI tools, local development environments, and test execution frameworks that let engineers iterate quickly and ship with confidence.
Raise the bar on production quality: Drive observability, incident response, and engineering best practices across the team.

5+ years of software engineering experience, with meaningful time spent on infrastructure, platform, or systems work.
Strong Python and Go — both are core to this role, not one primary and one secondary.
Deep understanding of distributed systems: consistency, fault tolerance, state management, concurrency.
Experience with Kubernetes and cloud-native infrastructure.
Experience building developer-facing tooling — CLIs, SDKs, local dev environments, or internal platforms.
Strong communicator who can drive technical decisions, write clear design docs, and mentor others.
High bar for code quality — thorough testing, thoughtful code review, and sustainable engineering practices.
Comfort operating what you build — on-call, incident response, and production ownership.
AI-native workflow — you actively use LLMs and AI-assisted tools in your daily development, and can leverage them to move faster and tackle problems that would otherwise be impractical.

We offer Cresta employees a variety of medical, dental, and vision plans, designed to fit you and your family’s needs
Paid parental leave to support you and your family
Monthly Health & Wellness allowance
Work from home office stipend to help you succeed in a remote environment
Lunch reimbursement for in-office employees
PTO: 3 weeks in Canada

Senior Software Engineer, Backend – AI Agent Runtime

Key skills