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Series D+ AI Startup Research Engineer Jobs

There are currently 78 open Research Engineer jobs across 13 Series D+ AI startups. Every listing links straight to the company's official application page, deduplicated and refreshed daily.

78Open roles
13Companies hiring
Nov 2, 2026Last updated
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Open Research Engineer Roles at Series D+ AI Startups

RoleCompanyStageLocationPosted
Research Engineer / Scientist, Data & EvalsHarveySeries G+San FranciscoNov 2, 2026
Research Engineer / Scientist, Reinforcement LearningHarveySeries G+New YorkNov 2, 2026
Research Engineer / Scientist, Reinforcement LearningHarveySeries G+San FranciscoNov 2, 2026
Research Engineer, InfrastructureHarveySeries G+New YorkNov 2, 2026
Research Engineer, InfrastructureHarveySeries G+San FranciscoNov 2, 2026
Research Engineer / Scientist, Data & EvalsHarveySeries G+New YorkNov 2, 2026
Research Engineer / Scientist, Data & EvalsHarveySeries G+LondonNov 2, 2026
Research Engineer / Scientist, Data & EvalsHarveySeries G+RemoteNov 2, 2026
Research Engineer, InfrastructureHarveySeries G+LondonNov 2, 2026
Research Engineer, InfrastructureHarveySeries G+RemoteNov 2, 2026
Research Engineer / Scientist, Reinforcement LearningHarveySeries G+RemoteNov 2, 2026
Research Engineer / Scientist, Reinforcement LearningHarveySeries G+LondonNov 2, 2026
Research Engineer / Scientist, Pre-trainingAnthropicSeries G+Multiple locationsNov 1, 2026
Research EngineerCato NetworksSeries GMultiple locationsOct 25, 2026
Research EngineerTuringSeries EMultiple locationsOct 25, 2026
Research Engineer, Frontier DataTuringSeries EMultiple locationsOct 25, 2026
Senior Research EngineerTuringSeries EMultiple locationsOct 25, 2026
Senior Research Engineer, Frontier DataTuringSeries EMultiple locationsOct 25, 2026
Senior Research Engineer, SWETuringSeries EMultiple locationsOct 25, 2026
Staff Research EngineerTuringSeries EMultiple locationsOct 25, 2026
Staff Research Engineer, Enterprise KnowledgeTuringSeries EMultiple locationsOct 25, 2026
Staff Research Engineer, Frontier DataTuringSeries EMultiple locationsOct 25, 2026
Research Engineer, Chip Design RLAnthropicSeries G+San Francisco, CAOct 21, 2026
Research Engineer, RL FrontiersEtchedSeries DSan JoseOct 21, 2026
Research Engineer, Cybersecurity RL (Reinforcement Learning)AnthropicSeries G+Multiple locationsOct 20, 2026
Research Engineer, InterpretabilityAnthropicSeries G+San Francisco, CAOct 20, 2026
Security Engineer / Research Engineer, RL SecurityAnthropicSeries G+Multiple locationsOct 20, 2026
Research Engineer (Cyber security)Cato NetworksSeries GMultiple locationsOct 20, 2026
Research Engineer - Data InfrastructureElevenLabsSeries DMultiple locationsOct 19, 2026
Internal Acceleration, Research Engineer (ASIC)EtchedSeries DSan JoseOct 15, 2026
Internal Acceleration, Research Engineer (Hardware)EtchedSeries DSan JoseOct 15, 2026
Internal Acceleration, Research Engineer (Production)EtchedSeries DSan JoseOct 15, 2026
Internal Acceleration, Research Engineer (Kernels)EtchedSeries DSan JoseOct 15, 2026
Senior Staff Research EngineerNetradyneSeries DMultiple locationsOct 14, 2026
Research EngineerElevenLabsSeries DMultiple locationsOct 11, 2026
Research Engineer, Safety & AlignmentCognitionSeries ESan FranciscoOct 9, 2026
Research Engineer, Applied ResearchSierraSeries ESan Francisco, CAOct 5, 2026
Staff Research Engineer, Multi-Agent ScalingAnthropicSeries G+Multiple locationsOct 2, 2026
Research Engineer, RL EngineeringAnthropicSeries G+Multiple locationsOct 1, 2026
Research Engineer / Performance Engineer, RL Distributed SystemsAnthropicSeries G+Multiple locationsSep 29, 2026
Research Engineer, Post-Training Model EvaluationsAnthropicSeries G+Multiple locationsSep 27, 2026
Research Engineer, Visual Knowledge WorkAnthropicSeries G+Multiple locationsSep 22, 2026
Research Engineer, Cybersecurity RL (Reinforcement Learning)AnthropicSeries G+Zürich, CHSep 7, 2026
Research Engineer, SafetyDecagonSeries DMultiple locationsSep 4, 2026
Research Engineer, Audio and SpeechDecagonSeries DMultiple locationsSep 4, 2026
Senior Research Engineer, SafetyDecagonSeries DMultiple locationsSep 4, 2026
Applied AI, Research EngineerAnthropicSeries G+Multiple locationsSep 4, 2026
[Expression of Interest] Research Engineer / Scientist, Alignment - LondonAnthropicSeries G+London, UKAug 28, 2026
Research Engineer, Machine Learning (Reinforcement Learning)AnthropicSeries G+London, UKAug 28, 2026
Research Engineer, Machine Learning (RL Velocity)AnthropicSeries G+London, UKAug 28, 2026
View all Research Engineer jobs
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FAQ

How many Research Engineer jobs are open at Series D+ AI startups?

There are currently 78 open Research Engineer jobs across 13 Series D+ AI startups on Fast AI Jobs.

Why filter Research Engineer jobs by funding stage?

Funding stage signals company size, runway, and equity upside. Filtering to Series D+ startups narrows the list to Research Engineer roles at companies at a comparable point in their growth.

How often is this list updated?

Listings are refreshed daily from official company career pages and deduplicated by posting. Every link points to the original application page.