Senior Staff Software Engineer, Serving

Liftoff is an AI-powered performance marketing platform for the mobile app economy. The Senior Staff Software Engineer on the Accelerate Serving team will design, build, and operate high-throughput, low-latency ad-serving infrastructure, including GPU-powered inference and feature store systems. The role also partners with machine learning engineers to productionize models and owns systems through design, deployment, observability, and optimization.

Responsibilities:

• Design, build, and operate the high-throughput, low-latency services that receive bid requests, execute Liftoff’s bidding logic, and respond to ad exchanges in real time
• Improve the performance, scalability, and reliability of systems that process millions of requests per second under strict latency constraints
• Develop and optimize GPU-powered inference services that execute neural network models using TensorRT
• Profile end-to-end inference pipelines to identify and eliminate bottlenecks in GPU utilization, batching, memory access, serialization, networking, and request handling
• Partner with machine learning engineers to productionize new model architectures and features, translating modeling requirements into efficient and reliable serving implementations
• Design and operate large feature store fleets that provide low-latency access to real-time and precomputed features
• Develop benchmarking and performance-analysis tools that help engineers compare models, understand latency and throughput trade-offs, and identify regressions before deployment
• Improve experimentation tooling that allows machine learning teams to orchestrate offline training runs, evaluate candidate models, and maintain model leaderboards
• Own changes through their full lifecycle—from system design and implementation to testing, deployment, observability, capacity planning, incident response, and continued optimization

Requirements:

• Strong core Computer Science fundamentals (data structures, algorithms, system architecture)
• 10+ years of industry experience
• M.S.. or higher in Computer Science (or equivalent work experience)
• This role is eligible for full-time remote work in one of our entities: CA, CO, ID, IL, FL, GA, MA, MI, MN, MO, NJ, NV, NY, OR, PA, TX, UT, and WA
• We expect our employees to attend these gatherings at least once per quarter
• Experience with Go is a plus