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Series D+ · Research Engineer

Series D+ AI Startup Research Engineer Jobs

There are currently 61 open Research Engineer jobs across 11 Series D+ AI startups. Every listing links straight to the company's official application page, deduplicated and refreshed daily.

61Open roles
11Companies hiring
Sep 15, 2026Last updated
01

Open Research Engineer Roles at Series D+ AI Startups

RoleCompanyStageLocationPosted
Staff Threat & Attack Research EngineerAndurilSeries G+Multiple locationsSep 15, 2026
Staff Threat & Attack Research EngineerAndurilSeries G+Seattle, Washington, United StatesSep 15, 2026
Staff Threat & Attack Research EngineerAndurilSeries G+Washington, District of Columbia, United StatesSep 15, 2026
Staff Threat & Attack Research EngineerAndurilSeries G+Costa Mesa, California, United StatesSep 15, 2026
Research Engineer, Takeoff IntelAnthropicSeries G+Multiple locationsSep 8, 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
Research EngineerTuringSeries EMultiple locationsSep 3, 2026
Research EngineerTuringSeries EMultiple locationsSep 3, 2026
Senior Research EngineerTuringSeries EMultiple locationsSep 3, 2026
Staff Research EngineerTuringSeries EMultiple locationsSep 3, 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
Research Engineer, PretrainingAnthropicSeries G+London, UKAug 28, 2026
Research Engineer, Pretraining Scaling - LondonAnthropicSeries G+London, UKAug 28, 2026
Research Engineer, Production Model Post-TrainingAnthropicSeries G+Zürich, CHAug 28, 2026
Research Engineer, RL Scaling ScienceAnthropicSeries G+London, UKAug 28, 2026
Research Engineer - InferenceElevenLabsSeries DMultiple locationsAug 28, 2026
Research Engineer - Web CrawlersElevenLabsSeries DMultiple locationsAug 28, 2026
Research Engineer - Data InfrastructureElevenLabsSeries DMultiple locationsAug 28, 2026
Staff+ Research Engineer, RL Data PlatformAnthropicSeries G+Multiple locationsAug 27, 2026
Senior Staff Research EngineerNetradyneSeries DMultiple locationsAug 26, 2026
Senior Applied Research Engineer - VideoSynthesiaSeries EEuropeAug 24, 2026
ML/Research Engineer, SafeguardsAnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, Chip Design RL (Reinforcement Learning)AnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, Code RL (Reinforcement Learning)AnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, Computer UseAnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, Cybersecurity RL (Reinforcement Learning)AnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, DiscoveryAnthropicSeries G+San Francisco, CAAug 21, 2026
Research Engineer, Domain ScalingAnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, InterpretabilityAnthropicSeries G+San Francisco, CAAug 21, 2026
Research Engineer, Knowledge TeamAnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, Life SciencesAnthropicSeries G+San Francisco, CAAug 21, 2026
Research Engineer, Machine Learning (Reinforcement Learning)AnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, Machine Learning (RL Velocity)AnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, Model EvaluationsAnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, Performance RL (Reinforcement Learning)AnthropicSeries G+San Francisco, CAAug 21, 2026
Research Engineer, Pretraining ScalingAnthropicSeries G+San Francisco, CAAug 21, 2026
Research Engineer, Production Model Post-TrainingAnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, RL EngineeringAnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer / Scientist, AlignmentAnthropicSeries G+San Francisco, CAAug 21, 2026
Research Engineer, UniversesAnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, Visual Knowledge WorkAnthropicSeries G+Multiple locationsAug 21, 2026
Staff Research Engineer, Discovery TeamAnthropicSeries G+Multiple locationsAug 21, 2026
Research Engineer, Post-TrainingCognitionSeries DSan FranciscoAug 6, 2026
Research Engineer, ML InfrastructureCognitionSeries DSan FranciscoAug 6, 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 61 open Research Engineer jobs across 11 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.