Realtime Engineer, Multi-Modal AI

About T4R Labs
T4R Labs is a deep tech lab building at the frontier of AI. We work on hard, unsolved problems where real-time performance, multi-modal understanding, and safety all have to hold up under production load — not just in a demo.

The Role
We're looking for an experienced realtime engineer to help us build systems that process and respond to audio, video, and text simultaneously, with the latency budgets of a live conversation rather than a batch job. You'll work at the intersection of low-latency infrastructure and multi-modal AI models, owning the pipelines that turn raw sensory streams into model inputs and model outputs into something a user experiences as instant.

This is a hands-on, high-ownership role. You'll be contributing to architecture decisions, not just implementing someone else's spec.

What You'll Do

• Design and build low-latency, high-throughput pipelines for streaming audio, video, and text into and out of multi-modal models
• Optimize end-to-end latency across the stack — networking, serialization, model inference, and rendering
• Work closely with ML engineers to co-design model interfaces that are realtime-friendly (streaming inference, chunked generation, interruption handling, etc.)
• Debug and eliminate jitter, dropped frames, and tail latency in production systems
• Build the monitoring and tooling needed to keep a realtime system observable and reliable
• Make pragmatic tradeoffs between quality, latency, and cost as the product scales

What We're Looking For

• 5+ years of experience building realtime or low-latency systems (e.g., video/voice conferencing, live streaming, gaming netcode, trading systems, or similar)
• Strong systems programming skills (C++, Rust, Go, or similar) and comfort reasoning about performance at the network, OS, and hardware level
• Experience with streaming protocols (WebRTC, RTP, gRPC streaming, or similar)
• Familiarity with the practical constraints of serving ML models in production — batching, quantization, streaming inference
• A track record of shipping systems that hold up under real user load, not just in benchmarks
• Comfort working in a fast-moving, early-stage environment with ambiguous specs
• Curious, entrepreneurial, and comfortable speaking your mind — we want people who'll push back on a bad idea, ours included
• A self-starter who takes real ownership and accountability, but also works well as part of a small, close-knit team

Bonus points for:

• Direct experience integrating multi-modal (audio/video/text) AI models into a live product
• Experience with GPU-accelerated inference serving (Triton, TensorRT, vLLM, or similar)
• Prior work on voice assistants, live translation, or interactive AI agents

Why T4R Labs

• Work directly with the founding team on problems that don't have off-the-shelf solutions
• High autonomy, high impact — your decisions ship
• We're seed stage: this role is equity only for now, with salary starting once we close funding

Work Authorization & Background Check
You must be a U.S. citizen or otherwise authorized to work in the United States without employer sponsorship. As an early-stage company, we're not able to sponsor work visas at this time. Final offers of employment are contingent on successful completion of a background check.

How to Apply
Reach out with your resume and a note on the most interesting realtime system you've built.