Backend Engineer for Distributed Systems

About Flair Labs

Flair Labs is building the most graceful voice AI for the real estate and lending industry. Our agents handle millions of calls per month — qualifying leads, scheduling appointments, and guiding borrowers through complex mortgage processes — at sub-800ms latency. Backed by Y Combinator (W24) and a $4M seed round, we're growing fast and looking for engineers who want to build foundational infrastructure, not maintain legacy systems.

The Role

We're looking for a backend engineer who wants to work on hard distributed systems problems where the stakes are real: latency kills calls, data loss loses leads, and reliability earns enterprise contracts.

What You'll Work On

• Design and scale distributed calling infrastructure handling millions of concurrent voice sessions
• Build high-throughput, low-latency data pipelines for real-time call processing

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• Own reliability, observability, and fault tolerance across our GCP-based architecture
• Architect multi-tenant systems serving mortgage lenders with strict SLA requirements
• Integrate with telephony (Twilio, SIP), CRMs, and LLM providers
• Optimize PostgreSQL and Redis layers for high-concurrency workloads

You Might Be a Fit If

• You have strong distributed systems fundamentals — you think in terms of consistency, availability, and fault tolerance
• You're experienced with async Python (asyncio) or similar event-driven backend frameworks

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• You've designed systems with real reliability requirements and have been on-call
• You have hands-on experience with GCP, AWS, or Azure and containerized deployments
• You've worked with message queues, stream processing, or real-time pipelines
• Bonus: experience with voice AI, telephony, or conversational AI

Stack

Python · asyncio · GCP · PostgreSQL · Redis · Twilio · Docker · LLM APIs · WebSockets

Interview Process

3 rounds — behavioral, live coding, and system design. No take-homes.

Compensation & Benefits

Base: $130,000 – $150,000

Equity: meaningful early-stage equity

Location: San Francisco, CA (Hybrid)

Visa sponsorship available (H-1B, O-1, OPT, and others)

Email: eddie@flairlabs.ai