Staff Software Engineer - Inference & Performance

We’re looking for a Staff Engineer to take technical ownership of latency, throughput, and reliability across Runware’s AI inference platform.

This is a senior technical leadership role for someone who obsesses over performance at scale, from request ingress through GPU execution to result delivery, and who can consistently turn ambitious targets such as sub-one-second inference into production reality.

As a Staff Engineer, you will define and drive the architecture, standards, and execution needed to make Runware one of the fastest and most reliable inference platforms in the market. You will work deeply across backend services, distributed systems, GPU workloads, and infrastructure, partnering closely with product, ML, and platform teams.

This role is ideal for someone who enjoys operating at the intersection of systems design, performance engineering, and real-world scale, and who wants clear ownership over outcomes that matter directly to customers.

• Own end-to-end inference performance across the platform, with clear responsibility for latency, throughput, and reliability targets
• Lead the architecture and design of core inference systems, including request routing, async execution, queuing, GPU scheduling, and result delivery
• Drive the platform toward sub-1 second inference where feasible, identifying bottlenecks across networking, services, storage, and GPU execution
• Make high-impact architectural decisions with performance, scalability, and operational simplicity as first-class concerns
• Partner with ML and model teams to ensure models are production-ready from a performance perspective (cold starts, batching, memory usage, concurrency)
• Define performance budgets, SLAs, and success metrics, and ensure they are measured, visible, and actively improved
• Lead deep-dive investigations into latency spikes, throughput degradation, and system-level performance issues
• Influence and mentor engineers across teams on performance engineering, distributed systems thinking, and operational excellence
• Improve tooling, observability, and profiling capabilities to make performance issues easier to detect and reason about
• Advocate for pragmatic engineering best practices around testing, benchmarking, rollouts, and documentation

• Excellent experience in software engineering, with a strong focus on backend and systems development (PHP, Python, Go, Rust, or similar)
• Proven experience building and operating high-performance, low-latency distributed systems in production
• Deep understanding of asynchronous processing, queues, concurrency models, and back pressure
• Strong intuition for performance trade-offs across CPU, GPU, networking, storage, and application layers
• Experience making and defending critical architectural decisions in complex systems
• Hands-on experience troubleshooting real production issues under load (latency, saturation, cascading failures)
• Familiarity with modern cloud infrastructure, CI/CD, and observability stacks (metrics, tracing, profiling)
• Ability to communicate clearly and influence across teams in a remote-first environment
• Strong mentorship mindset and a desire to raise the technical bar across the organisation

• Experience working on AI/ML inference platforms, GPU-backed workloads, or performance-critical compute systems
• Knowledge of model optimisation techniques (batching, quantisation, warm-starts, memory management)
• Experience with infrastructure-as-code and DevOps practices
• Background in startups or fast-paced environments where speed, ownership, and pragmatism matter
• Prior ownership of latency or throughput SLOs at scale

We’re a remote-first collective, meeting in person twice a year to plan, brainstorm, celebrate wins, and enjoy some face-to-face time. We have core hours for cooperative working and calls, but outside of that your calendar is yours. Work the hours that let you perform at your peak while also building a healthy life.

Our release cycles are fast and intense, but they’re followed by real downtime. After big pushes we expect the team to unplug, recharge, and come back ready & stronger than ever for the next leap.

• Generous paid time off – vacation, sick days, public holidays
• Meaningful stock options – share in the upside you create
• Remote-first setup – work from home anywhere we can employ you
• Flexible hours – own your schedule outside core collaboration blocks
• Family leave – paid maternity, paternity, and caregiver time
• Company retreats – twice-yearly gatherings in inspiring locations

Please note: We are unable to offer visa sponsorship in the UK at this time. Candidates must have existing right to work in the UK.