Machine Learning Engineer Jobs at Startups

SpaceXSI is building Super Intelligence to help humanity understand the universe, creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next. You will own and elevate our mission-critical research platform that directly accelerates SpaceXSI's frontier work. The evals team creates and executes instruments for measuring model capabilities and behaviors, used to clean datasets, provide feedback for experiments, and track growth throughout training. We also diagnose why agents fail and how to make improvements, managing execution infrastructure, designing data sets and grading schemes. You will design, build, and ship delightful and bulletproof systems that engineers love to use every day, valuing strong attention to detail, first principles reasoning, and great taste.

$175k - $275k

Mirage is an AI video company focused on making creation dramatically easier by tackling complex challenges in generative media. We are building multimodal agents that transform creative direction into edits, rendering engines that composite video and graphics, and generative video models. Our flagship creative workspace is Captions, powered by our Tesseract engine which provides AI agents with native video-editing capabilities and offers APIs for developers to integrate our models into their products.

$175k - $300k

As an ML Infrastructure Engineer, you will play a pivotal role in building and optimizing the reliable, high-performance ML platform that powers recommendations on X. We're looking for exceptional engineers who are passionate about our mission and have a strong desire to make a meaningful impact.

$180k - $440k

Snorkel AI

Snorkel AI is seeking an early member for its ML & Research Engineering team to help build the data and environments behind high-performing frontier and agentic AI. You will be responsible for making the process of generating and evaluating frontier AI data faster, cheaper, and more rigorous using ML and AI. This role involves studying data generation and evaluation, forming and validating hypotheses with production data, and shipping scalable solutions. You will play a key part in shaping the direction, standards, and growth of the discipline.

$208k - $315k

Moveworks is seeking a Senior Staff ML Engineer to join our AI Safeguards team. In this role, you will be instrumental in designing, building, and shipping critical safeguards within our agent harness. Your work will focus on protecting against prompt injection, single and multi-turn jailbreaks, toxicity, sensitive topics, and sensitive data exposure. You will develop robust evaluation frameworks to measure the efficacy of these safeguards, addressing both false positives and false negatives using diverse datasets. Collaboration with our Security team will be key, translating their findings into actionable eval cases and fixes, and co-developing mitigations. You will also select, integrate, and fine-tune detection models within a shared stack serving both commercial and government environments, while carefully balancing quality, latency, and cost for controls operating in the request path. Additionally, you will build configurable safeguard policies to empower customers in managing sensitive topics and monitor safeguard behavior in production, addressing any regressions.

Salary not listed

MatX is building the compute platform for AGI, developing vertically integrated full-stack solutions from silicon to systems. We focus on hardware and software to train and run the largest ML workloads for AGI, primarily using the Rust programming language. This role involves designing and optimizing kernels that interface directly with our hardware, working in partnership with ML Research and Hardware Engineering teams, and providing expertise on hardware architecture from a programmer's perspective to ensure seamless integration with the software stack.

$160k - $275k

Figure is an AI robotics company developing autonomous general-purpose humanoid robots with the goal of shipping robots with human-level intelligence for home and commercial markets. The Helix team is responsible for developing the core AI systems that power humanoid autonomy. We are seeking a Helix AI Engineer, Video Pretraining to lead the development of large-scale video foundation models trained on diverse real-world and robot-collected data. This role focuses on pretraining models that learn from raw video, capturing motion, interaction, and temporal structure to enable downstream capabilities in perception, prediction, and embodied reasoning.

$200k - $400k

Figure is an AI robotics company developing autonomous general-purpose humanoid robots with the goal of shipping robots with human-level intelligence. These robots are engineered to perform a variety of tasks in both home and commercial markets. We are seeking a Reinforcement Learning Engineer to focus on the development, training, deployment, and evaluation of advanced reinforcement learning algorithms specifically for the whole-body control of our humanoid robots.

$150k - $350k

Sieve

Sieve is a multi-modal lab focused on curating high-quality training datasets across video, audio, images, text, and 3D, aiming to solve the bottleneck in the growth of AI applications. As a perception-focused Machine Learning Engineer, you will build systems that transform raw sensor footage into training data crucial for robotics and world-model teams. This role requires a strong background in computer vision, particularly in shipping perception systems for robots, devices, or autonomous vehicles, and applying these skills to massive datasets.

Salary not listed

OpenSpace is redefining how complex projects are built using an AI-powered Visual Intelligence Platform that leverages computer vision and spatial AI to provide construction teams with a real-time view of on-site activities. This role focuses on owning core algorithms for mapping, localization, image analysis, and 3D reconstruction using real-world construction site data. The position integrates advanced computer vision with modern machine learning methodologies, utilizing classical CV, deep learning (including transformers and multi-modal models), and probabilistic modeling to deliver meaningful customer insights.

CA$168k - CA$220k

Turing

This role focuses on ensuring the quality and sensitive data compliance of enterprise data as it flows through our systems. You will be responsible for building machine learning models that detect and replace sensitive information like PII, PHI, and company-identifiable data in text and image formats. This involves developing detection models, validation infrastructure, adversarial test sets, and audit processes to guarantee data integrity and de-identification performance. You will work closely with a senior ML lead, focusing on hands-on engineering with a strong QA mindset, ensuring data remains useful and secure for downstream applications.

Salary not listed

Inworld is a research lab and inference provider focused on real-time AI for consumer-facing applications. We build first-party speech models, serve LLMs, and run the inference behind modular APIs designed for high-volume, real-time workloads. Our models and infrastructure support consumer applications across companions, healthcare, fitness, education, media, and more, serving over 10 trillion LLM tokens per month. We are looking for strong individuals from varied backgrounds who learn fast, thrive in ambiguity, and can demonstrate their experience in building, breaking, and understanding complex systems.

$250k - $300k

Ema builds AI Employees for HR, IT, and Finance, automating busy work across the employee experience. Founded by former executives from Google, Coinbase, Flipkart, and Okta, our team comprises engineers from premier tech companies and graduates of top universities. We are backed by leading investors and are at the forefront of Agentic AI, shipping real systems that run business processes at scale. We are seeking innovative and passionate Machine Learning Engineers who excel at solving complex problems with large datasets, transforming theoretical concepts into practical, scalable solutions, and pushing the boundaries of Natural Language Processing and Information Retrieval.

$160k - $220k

EnCharge AI is developing a next-generation AI platform featuring a novel in-memory-computing architecture designed to significantly improve energy efficiency and performance for AI inference workloads. We believe that as AI demands evolve, the underlying infrastructure must also advance. Our team, comprised of experienced AI researchers, silicon and systems engineers, and architects, is backed by leading investors and is positioned to be a key player in the future of AI innovation.

Salary not listed

Confido

Confido is seeking a Senior ML Ops Engineer to be the first dedicated owner of its ML platform. This role will be responsible for the pipelines, serving, and cloud foundation that enable AI/ML models and agents to operate reliably and cost-efficiently in production. The engineer will ensure the platform can handle large-scale workloads, including document understanding, forecasting, and agentic systems, with a focus on making AI/ML development and deployment seamless for the AI/ML team.

$210k - $300k

Cosine is seeking an Applied ML Technical Lead to join their UK AI lab, focusing on developing and deploying advanced AI capabilities for UK Defence and national security organizations. This is a hands-on technical leadership role where you will guide the technical direction and day-to-day progress of applied ML projects, translating research into operational capabilities. You will work across machine learning development, deployment, and customer-facing technical delivery, potentially involving training and evaluating models on complex sensor data, and engaging with Defence stakeholders to understand needs and shape priorities. The role requires coordinating ML researchers, software engineers, and infrastructure teams, identifying and resolving technical risks, and establishing clear evaluation criteria to demonstrate progress through measurable improvements and working capabilities.

Salary not listed

Cohere Health

Cohere Health is seeking a Staff Software Engineer to join their Integrations team. This role involves designing, developing, and scaling highly available healthcare integration systems that support prior authorization workflows across providers, payers, and delegated entities. You will provide technical leadership, drive platform engineering, and lead the development of secure integrations with internal and external systems. The position emphasizes cloud infrastructure, deployment automation, distributed architectures, and operational excellence, ensuring system reliability and performance. You will also champion automated testing, lead production issue resolution, and collaborate cross-functionally to align solutions with organizational goals. Mentorship and team development are also key aspects of this role, fostering technical excellence and contributing to hiring and coaching initiatives.

Salary not listed

Cohere Health

Cohere Health is seeking a senior-level automation engineer to enhance release quality, environment reliability, and change safety across their healthcare platform. This role involves partnering with Product, Engineering, Platform, and SRE teams to develop scalable automation, guardrails, and validation systems. The engineer will shape automation strategy, integrate quality into the Software Development Life Cycle (SDLC), and define safe change management processes in a regulated, high-impact domain. This position offers significant influence over release safety, platform reliability, and how engineering teams deliver software.

Salary not listed

Cohere Health

Cohere Health is seeking a Senior Software Engineer to join their Data Platform team. This remote-first role involves designing and delivering large-scale, reliable, and governed data pipelines that power analytics, operations, and clinical intelligence. The ideal candidate will thrive on solving complex data challenges, mentoring others, and improving engineering standards while contributing to platform growth. You will operate across the end-to-end data lifecycle, ensuring data products are performant, compliant, and trustworthy by partnering closely with analytics engineers, architects, and product stakeholders.

$135k - $160k

Cohere Health

We are seeking a Lead Software Engineer to join our Integrations team, focusing on designing, developing, and scaling highly available healthcare integration systems for prior authorization workflows. You will lead an agile team in building and operating an enterprise integration platform, driving technical excellence at the intersection of healthcare interoperability and modern distributed systems. This is a remote-first role with occasional travel requirements for onboarding and team meetings.

$150k - $185k

Cohere Health

We are seeking a Sr. Data Engineer to help drive the technical vision of our Data Engineering team as we scale our infrastructure, services, and architecture. This role is ideal for someone who blends deep technical expertise with strategic thinking and cross-functional influence. As a Sr. Data Engineer, you will partner closely with other data and analytics engineers, architects, product leaders, and business stakeholders to evolve our data infrastructure in support of high-trust, scalable, and business-aligned outcomes. You’ll also serve as a force multiplier across teams, raising the bar for data engineering excellence and accelerating the maturity of our data platform capabilities.

Salary not listed

Cohere Health

We are seeking a Senior Data Engineer to join our team and contribute to the design and delivery of our cloud-native healthcare data platform. This role involves implementing scalable data solutions on AWS, utilizing technologies like Apache Iceberg, Lake Formation, Glue Catalog, Athena, and dbt, along with modern orchestration frameworks. You will collaborate closely with platform, analytics, and business teams, combining strong hands-on engineering with cross-functional teamwork to drive technical execution from design through production deployment.

Salary not listed

Cohere Health

This role offers a unique opportunity to join a rapidly growing software engineering team focused on building impactful healthcare technology using a modern tech stack. You will contribute to a business intelligence platform, taking ownership of end-to-end feature releases, platform enhancements, and system optimization. The ideal candidate is an empathetic, candid, and kind teammate who thrives in a diverse and inclusive environment, contributing to a supportive and growth-oriented culture.

Salary not listed

Cohere Health

Cohere Health is seeking a Lead Applied Scientist to join their team and deploy machine learning models that automate administrative clinical practices. The Applied Science team focuses on designing, prototyping, and deploying production models that extract or predict clinical findings from various data sources. This role involves collaborating with AI Engineering to monitor these deployed models. The company's platform connects health plans and providers using AI-powered solutions to optimize care speed, cost, and quality, with a recent expansion into payment integrity services. Cohere Health has received industry recognition for its innovations in health technology.

Salary not listed