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Series D+ AI Startup Research Engineer Jobs

There are currently 62 open Research Engineer jobs across 12 Series D+ AI startups. Every listing links straight to the company's official application page, deduplicated and refreshed daily.

62Open roles
12Companies hiring
Jun 15, 2026Last updated
01

Open Research Engineer Roles at Series D+ AI Startups

RoleCompanyStageLocationPosted
Research Engineer, RL EngineeringAnthropicSeries G+San Francisco, CAJun 15, 2026
Senior GenAI Research Engineer - Optimization and KernelsDatabricksSeries G+Mountain View, CaliforniaJun 15, 2026
Research Engineer, Code RL (Reinforcement Learning)AnthropicSeries G+San Francisco, CAJun 11, 2026
Staff Research Engineer - CodeTuringSeries ESan Francisco, California, United StatesJun 11, 2026
Staff Research Engineer - RL GymsTuringSeries ESan Francisco, California, United StatesJun 11, 2026
Research Engineer (Scaling Multimodal Data)World LabsSeries ESan FranciscoJun 11, 2026
Research Engineer / Scientist (3D Reconstruction)World LabsSeries ESan FranciscoJun 11, 2026
Research Engineer / Scientist (3D Tech Lead)World LabsSeries ESan FranciscoJun 11, 2026
Research Engineer / Scientist (SLAM)World LabsSeries ESan FranciscoJun 11, 2026
Research Engineer, Cybersecurity RL (Reinforcement Learning)AnthropicSeries G+San Francisco, CAJun 10, 2026
Research Engineer, Performance RL (Reinforcement Learning)AnthropicSeries G+San Francisco, CAJun 10, 2026
Research Engineer, Safeguards LabsAnthropicSeries G+San Francisco, CAJun 3, 2026
Research Engineer, Knowledge FoundationsAnthropicSeries G+San Francisco, CAMay 26, 2026
Machine Learning Systems Research Engineer, Agent Post-training - Enterprise GenAIScale AISeries G+San Francisco, CAMay 26, 2026
Principal Research EngineerSynthesiaSeries EEuropeMay 22, 2026
Research Engineer, Economic Research Data PlatformAnthropicSeries G+San Francisco, CAMay 20, 2026
Senior Research Engineer, Voice + SpeechDecagonSeries DSan FranciscoMay 18, 2026
Staff Research Engineer, Voice + SpeechDecagonSeries DNew York CityMay 18, 2026
Senior Research Engineer, Voice + SpeechDecagonSeries DNew York CityMay 18, 2026
Senior Research EngineerNetradyneSeries DBangaloreMay 18, 2026
Research Engineer, Knowledge TeamAnthropicSeries G+Remote (Friendly (Travel-Required))May 6, 2026
Research Engineer, AgentsDecagonSeries DNew York CityMay 5, 2026
Research Engineer, AgentsDecagonSeries DSan FranciscoMay 5, 2026
Senior Research EngineerDecagonSeries DNew York CityApr 23, 2026
Staff Research EngineerDecagonSeries DNew York CityApr 23, 2026
Research Engineer, Machine Learning (RL Velocity)AnthropicSeries G+Remote (Friendly (Travel-Required))Apr 23, 2026
Research Engineer, Machine Learning (RL Velocity)AnthropicSeries G+London, UKApr 23, 2026
Staff Research Engineer - Video Post TrainingSynthesiaSeries EEuropeApr 23, 2026
Research Engineer, AI ObservabilityAnthropicSeries G+San Francisco, CAApr 15, 2026
Research Engineer, InfrastructureCognition AISeries DSan FranciscoApr 8, 2026
Research Engineer / Scientist, Frontier Red Team (Cyber)AnthropicSeries G+San Francisco, CAApr 7, 2026
ML/Research Engineer, SafeguardsAnthropicSeries G+San Francisco, CAApr 3, 2026
Research Engineer, DiscoveryAnthropicSeries G+San Francisco, CAApr 3, 2026
Research Engineer, InterpretabilityAnthropicSeries G+San Francisco, CAApr 3, 2026
Research Engineer, Machine Learning (Reinforcement Learning)AnthropicSeries G+London, UKApr 3, 2026
Research Engineer, Machine Learning (Reinforcement Learning)AnthropicSeries G+San Francisco, CAApr 3, 2026
Research Engineer, Production Model Post-TrainingAnthropicSeries G+Zürich, CHApr 3, 2026
Research Engineer, Production Model Post-TrainingAnthropicSeries G+San Francisco, CAApr 3, 2026
Research Engineer / Scientist, Alignment ScienceAnthropicSeries G+San Francisco, CAApr 3, 2026
Research Engineer / Scientist, Alignment Science - LondonAnthropicSeries G+London, UKApr 3, 2026
Research Engineer, UniversesAnthropicSeries G+Remote (Friendly (Travel-Required))Apr 3, 2026
Staff Research Engineer, Discovery TeamAnthropicSeries G+San Francisco, CAApr 3, 2026
Senior Staff Research EngineerNetradyneSeries DBangaloreApr 3, 2026
Research Engineer, PretrainingAnthropicSeries G+London, UKApr 1, 2026
Research Engineer, Pretraining ScalingAnthropicSeries G+San Francisco, CAApr 1, 2026
Research Engineer, Pretraining Scaling - LondonAnthropicSeries G+London, UKApr 1, 2026
Research Engineer, Science of ScalingAnthropicSeries G+London, UKApr 1, 2026
Staff Research EngineerNetradyneSeries DBangaloreApr 1, 2026
Post-Training Research EngineerBasetenSeries ESan FranciscoMar 23, 2026
Senior Research Engineer - Video Foundation Models (Pre - Training)SynthesiaSeries EEuropeMar 10, 2026
View all Research Engineer jobs
02

FAQ

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

There are currently 62 open Research Engineer jobs across 12 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.