Senior Software Engineer, Backend (AI Agent Runtime) in Toronto

Cresta is on a mission to turn every customer conversation into a competitive advantage by unlocking the true potential of the contact center. Our platform combines the best of AI and human intelligence to help contact centers discover customer insights and behavioral best practices, automate conversations and inefficient processes, and empower every team member to work smarter and faster.

About The Role

• Own model serving: Design, build, and maintain low-latency, highly-available serving stacks for in-house ML model serving and integrating with LLM serving partners.
• Automate training pipelines: Orchestrate data prep, training, evaluation, and registry workflows on Kubernetes with solid MLOps practices.
• Optimize at scale: Profile and tune throughput, memory, and cost; introduce caching, sharding, batching, and GPU/CPU autoscaling where it pays off.
• Build platform primitives: Create reusable SDKs, templates, and CLI tools that let research and product teams ship models independently and safely.
• Raise the bar: Instrument deep observability (tracing, metrics, alerts), drive blameless post-mortems, and mentor engineers on production ML best practices.

What We’re Looking For

• 5+ years writing production software; 2+ years focused on ML platform or infra.
• Expert Python (async, typing, packaging, performance).
• Working Golang knowledge for systems components.
• Proven experience with one or more serving frameworks (e.g., vLLM, Triton, TorchServe).
• Kubernetes and cloud-native ops.
• Solid grasp of distributed systems, networking, and container security.
• Culture of rigorous testing, code review, and continuous delivery.

Nice-to-haves

• Hands-on with large language models or real-time streaming inference.
• Terraform, Helm, or similar IaC tooling.
• Experience in speech or conversational AI domains.

Perks & Benefits

• 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.
• Compensation for this position includes a base salary, equity, and a variety of benefits.

We are actively hiring for this role in the US and Canada. Your recruiter can provide further details.

We have noticed a rise in recruiting impersonations across the industry, where scammers attempt to access candidates’ personal and financial information through fake interviews and offers. All Cresta recruiting email communications will always come from the@cresta.aidomain. Any outreach claiming to be from Cresta via other sources should be ignored. If you are uncertain whether you have been contacted by an official Cresta employee, reach out to recruiting@cresta.ai.