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Software Engineer (C++ Systems)
Thunder Compute, a YC-backed GPU virtualization startup, is hiring a C++ systems engineer in San Francisco to build the core of its GPU virtualization library and GPU cloud platform. The role centers on microsecond-level performance optimization, low-level GPU systems research, and production systems debugging.
Software Engineer - Marketplace (Growth Infrastructure)
AfterQuery, a fast-growing AI data-infrastructure startup in San Francisco, seeks a full-stack engineer (2+ yrs) to build its expert marketplace platform — outreach tooling, AI interviewing, assessments, onboarding and matching — using TypeScript, Next.js, React, Node.js, Python, and AWS/GCP infra.
Software Engineer - RL Environments
Software Engineer on the Environments team at AfterQuery, a San Francisco applied AI research lab: design datasets, evaluation rubrics, and reward signals for RLHF/RLVR training of frontier models, working hands-on with top AI labs. Base $260k-$290k plus profit share and equity; in-person role with visa sponsorship.
Staff Software Engineer, Accounts & Ledgering
Staff backend engineer at Commure (healthcare AI) who owns money-critical financial systems from 0 to 1: designing and operating a double-entry payment ledger, insurance/patient account ledgers, posting pipelines, and bank reconciliation on large-scale PostgreSQL. Requires 8+ years backend, strong Python/SQL; hybrid in Mountain View, SF, LA, or NYC.
Staff Software Engineer - Biller Workflows
Staff engineer (8+ yrs) at healthcare company Commure, setting technical direction for the biller-workflow platform in its practice-management product and leading a multi-team rebuild of high-traffic claims surfaces. Core stack: React 19, TypeScript, Python/FastAPI, PostgreSQL, plus LLM/AI features and EDI X12.
Founding Engineer
Founding Engineer at Porter (YC S20), a cloud platform that lets engineering teams build, deploy, and manage production-grade infrastructure on AWS, Azure, and GCP. The role owns full-lifecycle development, deep systems debugging, and direct customer support in autonomous 2-week cycles, based in New York with $200k-$270k plus equity.
Founding Software Engineer
Founding Software Engineer at Helicon, a defense/aerospace advanced-materials startup, building Argos — an in-house operating system for a composite manufacturing facility covering supply chain, pricing, inventory, robotics orchestration, AI post-training/simulation and a 24/7 digital twin. Full-stack TypeScript with Python or Go backends, on-site in Los Angeles.
Member of Technical Staff
Member of Technical Staff at ClarityCare AI builds and operates production AI agents for clinical decision-making: architecting RAG pipelines and multi-agent workflows, integrating with EHR/FHIR/HL7 standards, and monitoring live deployments while working directly with customers and founders. In-person in San Francisco 5 days/week.
Member of Technical Staff
At Bluejay (voice AI agent platform), a Member of Technical Staff builds simulation, analysis and evaluation systems for conversational AI, plus resilient AWS infrastructure handling millions of real-time calls, with full-stack ownership and on-site customer work. Stack: Python, FastAPI, Supabase, AWS, LLM and voice tooling; 5 days/week in San Francisco.
Member of Technical Staff, Forward Deployed
Forward Deployed Engineer at Chakra Labs, an early-stage AI startup building RL environments and trajectory datasets for frontier AI lab customers. You'd shape training data, handcraft RL tasks, and spin up customer-facing dashboards on tight timelines using TypeScript, Python, Go, Vercel, Supabase, and AWS/EKS, on-site in Flatiron, NYC.
Member of Technical Staff, Head of Quality
Plato, an applied research lab building simulated environments and data infrastructure for training specialized AI agents, is hiring a hands-on Head of Quality in San Francisco. They review datasets and environment outputs, build automated QA/evaluation systems that catch reward hacking and broken verifiers, and hire and lead the QA team.
Member of Technical Staff, Inference Systems
Photon is hiring systems engineers to build a next-generation AI inference platform from scratch in Rust — owning batching, scheduling, KV cache management, request routing, and multi-GPU serving. It's an on-site role in Palo Alto for engineers with deep inference-internals knowledge.