Member of Technical Staff - Post-Training
Reflection
Our Mission Reflection’s mission is to build open superintelligence and make it accessible to all . We’re developing open weight models for individuals, agents, enterprises, and even nation states. Our team of AI researchers and company builders come from DeepMind, OpenAI, Google Brain, Meta, Character.AI, Anthropic and beyond. About the Role Build systems that transform powerful pre-trained models into aligned and general agents. Drive research and engineering initiatives that push the frontier of post-training, from data curation to large-scale optimization. Develop data generation pipelines, reward models, reinforcement learning algorithms, and inference-time scaling techniques. Collaborate across pre-training and post-training teams to deliver step-function gains in model capability. Contribute to shaping our understanding of how large models learn to reason, follow instructions, and improve through reinforcement learning. About You Deep understanding of machine learning fundamentals and practical experience with large-scale LLM training. Strong engineering skills, comfortable diving into complex ML codebases and distributed systems. Experience improving model behavior through data, reward modeling, or RL techniques. Evidence of owning ambitious research or engineering agendas that led to measurable model improvements. Thrive in a fast-paced, high-agency startup environment; bias toward action and clarity of execution. Able to work fluidly across research and infra boundaries Strong communication capabilities and comfort working collaboratively Passionate about advancing the frontier of intelligence. What We Offer: We believe that to build superintelligence that is truly open, you need to start at the foundation. Joining Reflection means building from the ground up as part of a small talent-dense team. You will help define our future as a company, and help define the frontier of open foundational models. We want you to do the most impactful work of your career with the confidence that you and the people you care about most are supported. Top-tier compensation: Salary and equity structured to recognize and retain the best talent globally. Health & wellness: Comprehensive medical, dental, vision, life, and disability insurance. Life & family: Fully paid parental leave for all new parents, including adoptive and surrogate journeys. Financial support for family planning. Benefits & balance: paid time off when you need it, relocation support, and more perks that optimize your time. Opportunities to connect with teammates: lunch and dinner are provided daily. We have regular off-sites and team celebrations. #J-18808-Ljbffr Reflection
- ...Pixeltable Inc. Member of Technical Staff San Francisco, CA·Full time Apply for Member of Technical Staff As a founding member of the engineering... ...and model lineage, spanning ingestion, transformation, training/fine-tuning, and inference? You will also: Find opportunities...TrainingFull timePart timeWork at officeWork from homeFlexible hours2 days per week
Pixeltable, Inc.
San Francisco, CA3 days ago $150k - $300k
...that enables anyone to create, train, and deploy them. We aggregate... ...and pair it with the full RL post‑training stack: environments,... ...our RL training stack. Core Technical Responsibilities LLM Serving... ...development and encourage team members to contribute to the broader AI...TrainingWork at officeRemote workVisa sponsorshipRelocation packageFlexible hoursShift work$150k - $300k
...that enables anyone to create, train, and deploy them. We aggregate... ...and pair it with the full RL post-training stack: environments,... ..., and reliable at scale. Core Technical Responsibilities Infrastructure... ...development and encourage team members to contribute to the broader...TrainingWork at officeRemote workVisa sponsorshipRelocation packageFlexible hours$150k - $300k
...infrastructure that lets anyone create, train, and deploy them. We aggregate... ...and pair it with the full RL post-training stack: environments,... ...that runs the jobs. Core Technical Responsibilities Hosted... ...development and encourage team members to contribute to the broader AI...TrainingWork at officeLocal areaRemote workVisa sponsorshipRelocation packageFlexible hours- ...our founding team. About the role We’re hiring a Founding Member of Technical Staff - Research to help advance the frontier of autonomous... ...core research problems in long-horizon evaluation, agent post-training, and environment design, with a focus on understanding where...TrainingWork at office
- ...applied research lab building the foundational infrastructure to train specialized AI agents. We turn real-world data streams... ..., and iteration feel like one seamless system. As a Member of Technical Staff, Infrastructure / DevOps, you will own the systems that make...Training
- ...alumni - Michael (DeepMind Robotics Reasoning), Arjun (RL post-training at Apple), and Ronak (Windsurf/DeepMind; trained SWE-1,... ...core agent products. We’re building our team of founding Members of Technical Staff to design the frontier of continually learning systems....Training
- ...key people from OpenAI, xAI and DoorDash. The Token Company trains machine learning models to compress raw LLM inputs before... ...people with a research and product focus. Role Overview As a Member of Technical Staff on our research team, you'll own the model training stack...TrainingVisa sponsorship
- Job Description As a Member of Technical Staff (Research) at Trajectory, you will design and build the post‑training stack that lets our customers’ models continually learn from real production workflows. You will own end‑to‑end experiments across data, training, and evaluation...Training
- ...uses Shapes every single day, and everyone talks to users. Member of Technical Staff is the title we use for engineers who own hard problems... ...magical Strong candidates may also have experience with LLM training, fine-tuning, evaluation, inference, or RAG at scale High-...Training
$185k - $255k
Member of Technical Staff - Reinforcement Learning Optimized deploys AI agents into the most critical supply chains in the world: the operations... ...Staff on reinforcement learning, you'll own RL and post-training: the reward models, training loops, and evaluations that...Training$300k
Member of Technical Staff - Mechanistic Interpretability About V max V max is an applied research lab... ...mechanistic interpretability to extract useful training signals from the internal states of... ...representations evolve during RL and post-training, and use these insights to...TrainingWork at officeLocal area- Member of Technical Staff — ML Systems & Inference Employment Type: Full-time Workplace: On-site About the Company We are building the execution... ...not a traditional machine learning role. You will not be training models or tuning benchmarks in isolation. You will be...TrainingFull time
$300k
Member of Technical Staff - RL Infrastructure About V max V max is an applied research lab developing AI capable of open-ended learning. We are... ...the systems layer for RL at scale: distributed rollouts, training orchestration, inference, evals, data pipelines, observability...TrainingWork at officeLocal area$200k
...approach combines frontier-scale pre-training, domain-specific RL, ultra-long context... ...models. The team supports pre-training, post-training, data, inference, and product... ...'s most important decisions. As a Member of Technical Staff on Evals, you will build both the platform...TrainingVisa sponsorshipRelocation package$256k - $276k
Opportunity As a Member of Technical Staff on AI Infrastructure, you will build and maintain the foundational systems and distributed infrastructure that power AI model post training, inference, and data pipelines. Responsibilities Design and implement large-scale, distributed...TrainingFlexible hours$300k
Member of Technical Staff - RL Algorithms About V max V max is an applied research lab developing AI capable of open-ended learning. We are... ...expertise. About the role RL has become the de-facto method of post-training LLMs. We are limited by the sample efficiency of the...TrainingWork at officeLocal areaShift work- The opportunity We are looking for a Member of Technical Staff with deep expertise in generative modelling to work at the interface between our... ...a deep understanding of generative model architectures, training dynamics and inference behaviour. You are a skilful ML developer...TrainingFlexible hours
- ...challenges of biology. We’ve redesigned the foundation model training stack to turn the world’s raw scientific data (e.g.... ...design and the responsibility to defend. About the Role As a Member of Technical Staff, Mechanistic Interpretability at Radical Numerics, you will...TrainingLocal area
$250k
...servers. The team is small, technical, and moving fast, with... ...Industry: AI Tools. The Role Member of Technical Staff who can handle everything from... ...scalable pipelines for training, inference, and data processing... ...Frontier applied-AI work: post-training open models and shipping...TrainingFull time$150k - $350k
Sieve — Member of Technical Staff, Applied Research Type: Full-time | On-site | San Francisco, CA Compensation... ...in those domains — high-quality training data. The company has partnered with... ...performance out of models + APIs via pre/post-processing, parallelism, pipelining,...TrainingFull timeWork experience placementH1bWork at officeVisa sponsorship$256k - $276k
Member of Technical Staff, AI Platform & Architecture Postman is the world’s leading API platform, used by more than 40 million developers and... ...and distributed infrastructure that power AI model post training, inference, and data pipelines. You will collaborate with...TrainingWork at officeFlexible hours3 days per week- Member of Technical Staff - Post‑Training Join to apply for the Member of Technical Staff - Post‑Training role at Reflection AI . Our Mission Reflection’s mission is to build open superintelligence and make it accessible to all. We’re developing open weight models for...TrainingFull timeRelocation package
- ...intelligence to serve humanity. We’re training and deploying frontier models for developers... ...the state of the art for model post training, ship state of the art models... ...embrace being remote-friendly! As a Member of Technical Staff, you will: Design and write high-performant...TrainingFull timeWork at officeRemote workFlexible hours
- Member of Technical Staff - Applied Research Patronus AI is a frontier lab developing simulation research and infrastructure to accelerate progress... ...research that defines how agentic AI systems are trained, evaluated and improved. You will work at the intersection...Training
- ...secure sandboxes, high-performance training, and deployment into one full-stack system for post-training at frontier scale -... ...they own. Core Technical Responsibilities This hybrid role... ...development and encourage team members to contribute to the broader AI...Training
$256k - $276k
...picture and our vision at Postman. The Opportunity As a Member of Technical Staff on AI Infrastructure, you will build and maintain the foundational... ...and distributed infrastructure that power AI model post training, inference, and data pipelines. You will collaborate with...TrainingWork at officeFlexible hours3 days per week$200k - $400k
About the Company Pilots don't train with real passengers. Actors don't rehearse with... ...Guillermo Rauch. About the Role As a Member of Technical Staff, Model Evaluations at Simile, you will... ...the basics of modern LLM training, post‑training, model evaluation, and hill‑climbing...TrainingFlexible hours- Member of Technical Staff - Agents at Prime Intellect - San Francisco Building the Future of Open Source + Decentralized AI At Prime Intellect,... ...enabling anyone to contribute compute, code or capital to train powerful, open models. Our ultimate goal? Openly accessible...TrainingRemote workFlexible hours
- Member of Technical Staff - Computational Biologist Valthos | Posted Mar 3 Full-time Negotiable Advanced (5-10 yrs) Computational Biologist Valthos Inc. Valthos... ...large-scale biological datasets appropriate for training frontier biological models, and build workflows...TrainingFull timeWork at office
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