[Remote] Senior Software Engineer, Backend (AI Agent Runtime)

🌍 Remote, USA 🎯 Full-time 🕐 Posted Recently

Job Description

Note: The job is a remote job and is open to candidates in USA. Cresta is on a mission to turn every customer conversation into a competitive advantage by unlocking the true potential of the contact center. The Senior Software Engineer will build real-time AI agent infrastructure, solve distributed systems problems, and enhance developer experience while ensuring high production quality.

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
Experience with real-time voice or streaming media systems
Hands-on with LLM integration — streaming inference, prompt orchestration, retrieval-augmented generation
Experience building serverless or function-as-a-service platforms
Workflow engines (Temporal, Argo, Airflow) for durable, long-running processes
Experience in conversational AI or speech domains
Infrastructure-as-code and GitOps workflows

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

Cresta uses artificial intelligence to assist sales and service agents in the quality of customer service. It was founded in 2017, and is headquartered in Palo Alto, California, USA, with a workforce of 201-500 employees. Its website is https://www.cresta.com.

Cresta has a track record of offering H1B sponsorships, with 9 in 2025, 6 in 2024, 2 in 2023, 10 in 2022, 4 in 2021, 3 in 2020. Please note that this does not guarantee sponsorship for this specific role.

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