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Senior Software Engineer, Infrastructure & Platform

AfterQuery
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Hybrid (San Francisco, CA)$220k - $280kFull-timePosted 7mo ago

About the role

Senior Software Engineer responsible for designing and building AfterQuery's core infrastructure powering data generation, evaluation, and agentic systems. Owns shared platforms enabling large-scale human-in-the-loop workflows, evaluation harnesses, and automated data pipelines for frontier AI model training; focused on scalability, reliability, and high-throughput workloads.

Responsibilities

  • Design and build core infrastructure systems: Architect and develop the shared infrastructure powering data generation platforms, human-in-the-loop systems, and evaluation pipelines.
  • Develop scalable distributed systems: Build systems capable of processing large-scale datasets and high-throughput workloads with strong reliability guarantees.
  • Build internal platforms and shared services: Create reusable infrastructure and APIs that enable product engineers and researchers to build quickly and reliably on top of core systems.
  • Optimize performance and reliability: Design systems with strong observability, monitoring, and fault tolerance to support production workloads at scale.
  • Own infrastructure architecture: Help define long-term system architecture across data pipelines, compute infrastructure, task orchestration, and storage systems.
  • Collaborate across engineering and research: Work closely with engineers and researchers to support new AI experimentation workflows and platform capabilities.
  • Establish engineering best practices: Define standards for system design, deployment, reliability, and infrastructure operations.

Qualifications

  • Strong experience building production distributed systems or platform infrastructure
  • Proficiency in Python and/or JavaScript (Node.js / Next.js) or similar backend technologies
  • Experience designing and operating systems in cloud environments (GCP or AWS)
  • Experience with message queues and event-driven systems (Kafka, RabbitMQ, Pub/Sub, etc.)
  • Experience working with high-throughput data pipelines and asynchronous processing systems
  • Strong understanding of system scalability, performance, and reliability
  • Experience owning systems running in production environments

Skills

Required:Production distributed systems / platform infrastructurePython and/or JavaScript (Node.js / Next.js)Cloud environments (GCP or AWS)Message queues and event-driven systemsHigh-throughput data pipelines and asynchronous processing
Last updated Aug 26, 2026. Interested? Apply on the company site.
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About AfterQuery

AfterQuery is an applied research lab curating data solutions to accelerate foundation model development.

AI researchdata solutionsfoundation model developmenttraining datasupervised fine-tuningreinforcement learningagent environmentscomputer use trajectories
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