AI Engineer Jobs at Startups

You.com is building the AI Search Infrastructure that powers modern AI systems, aiming to create a trusted knowledge layer for agents, applications, and enterprises. Our platform combines proprietary indexes with LLM-optimized retrieval systems to solve complex problems in search, large language models, and large-scale infrastructure, making AI systems more reliable, transparent, and useful. This hybrid product engineering and go-to-market role offers significant impact at the intersection of these areas, focusing on shaping our API surface and engaging directly with key customers.

$200k - $250k

We are building the AI layer of the Radio Access Network, applying agentic AI, machine learning, and LLMs to real RAN challenges. This role is for a Technical Lead to own the end-to-end architecture and technical direction of these AI systems. It is a hands-on senior individual contributor role, combining architecture, coding, technical leadership, and mentorship. You will work alongside RAN, PHY, and software teams, building production-grade AI solutions for real cellular networks.

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Synthio is seeking Solutions Engineers with strong engineering backgrounds and exceptional customer-facing skills to join their team. In this role, you will collaborate directly with leading pharmaceutical companies to understand their complex workflows, design innovative AI-powered solutions, prototype these solutions with clients, and guide them through to production. You will operate at the crucial intersection of customer needs, engineering, product development, and AI.

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Synthio is seeking exceptional AI Engineers to build deeply technical systems and communicate clearly about their work. You will operate across the AI stack, encompassing LLM orchestration, retrieval, agents, evaluations, voice systems, APIs, and production infrastructure. The role involves owning problems from initial exploration through deployment and ongoing iteration, contributing to the development of cutting-edge conversational voice and video AI for the life sciences industry. This is an opportunity to shape not only the product but also the company's identity and culture within an early-stage, fast-scaling startup.

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Synthio is seeking an Applied AI Engineer with a strong blend of AI engineering expertise and a deep understanding of the life sciences domain. This role is crucial for building next-generation conversational voice and video AI solutions tailored for the life sciences industry, ensuring 100% regulatory compliance. You will develop AI systems for healthcare professional (HCP), patient, medical, and commercial workflows, focusing on areas where scientific accuracy, reliability, and domain context are paramount. This is an opportunity to contribute to a fast-scaling, early-stage startup, shaping not only the product but also the company's identity and culture.

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StackBlitz

As a Staff Engineer on the AI team, you will lead the technical direction of AI agents that transform natural language into production-ready applications. This involves defining how LLMs are used to tackle complex challenges such as maintaining context across large codebases, orchestrating intuitive multi-step workflows, and managing everything from minor UI adjustments to significant architectural decisions. This role goes beyond simple API integration; you will establish the patterns and systems that guide AI reasoning and generation of full-stack applications, influencing the AI strategy across multiple teams and impacting the daily experience of millions of users building products with Bolt.

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StackBlitz

As a Senior Engineer on the AI team, you will build and improve the core coding AI agents that power Bolt.new. You will collaborate directly with product, design, engineering, and data to solve key agent challenges, including evaluation harnesses, context compression, maintaining context across large codebases, orchestrating intuitive multi-step workflows, and tackling everything from simple UI tweaks to complex architectural decisions. This role involves contributing to how AI reasons about and generates full-stack applications, working alongside experienced engineers in a problem space where patterns are still being invented. Your work will ship to millions of users building real products with Bolt.new daily.

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Artisan

Artisan is building a new, ambitious project at the frontier of agentic AI, pushing the boundaries of what AI agents can achieve. This role is for a hands-on technical lead responsible for designing and building the core AI architecture, focusing on agent behavior, multi-agent systems, tool use, context management, and evaluation. The position offers broad technical ownership as an individual contributor, involving consequential architecture decisions, writing critical system components, and close collaboration with existing engineers and leadership. The ideal candidate enjoys tackling uncertain problems and executing detailed engineering to deliver robust solutions.

$250k - $325k

LangChain is seeking a Senior Fullstack Engineer to join the LangSmith team, which builds the core platform for observability, evaluation, and production reliability of AI systems. This role offers the opportunity to shape the technical direction of the platform, working closely with enterprise customers, developer end-users, and internal stakeholders. You will lead the technical architecture and implementation of key product features, collaborating with product and design teams, and driving aggressive project timelines while maintaining high engineering standards. The position emphasizes writing clean, maintainable, and well-tested code, with a "get stuff done" attitude and strong ownership mindset.

$175k - $240k

LangChain is seeking a Senior Backend Engineer to join their growing engineering team in Boston, MA. This role will focus on building the backend systems that power LangSmith, LangChain's observability and evals platform. You will work on core services enabling customers to monitor and evaluate their AI applications at scale. While the primary focus is backend feature development, familiarity with full-stack engineering, performance tuning, and debugging production issues is beneficial. This is an opportunity to shape the future of AI observability at production scale.

$170k - $235k

Metal is seeking a Forward Deployed Engineer to join a strategic account at a leading private capital firm. This role involves embedding with the customer to own the entire process from scoping to production deployment of AI-driven workflows. You will bridge the gap between a top-tier investment team and their AI evolution, combining engineering expertise with customer empathy to reshape investment firm operations. This is a senior, high-autonomy position focused on delivering tangible customer outcomes.

$150k - $240k

Physical Intelligence

Physical Intelligence is seeking a Software Engineer focused on AI productivity to build and deploy tools that enhance AI utilization across the company. This role involves close collaboration with various teams, including engineering, research, and operations, to identify opportunities for AI leverage and translate them into robust internal tools and workflows. The position is within the Runtime team, which focuses on core systems for operational and research efficiency, alongside engineers working on build systems, infrastructure, and developer productivity. The primary focus will be on AI tooling, making AI agents, assistants, integrations, and automation valuable across the organization.

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Code Metal

Code Metal is seeking a Principal Python Engineer to join their Modeling & Simulation team. This role will focus on building the Python services, pipelines, and tooling that drive the core wargaming simulation for a next-generation decision-support platform. You will design backend services and APIs that interface with the frontend, integrate with simulators, manage data, and expose results to analysts and government stakeholders. The position involves developing backend infrastructure that interfaces with agentic AI and machine learning pipelines, designing scenario-generation and campaign-evaluation workflows, and building distributed, cloud-scale infrastructure for running simulations. Strong command of cloud services and distributed architectures is essential.

$250k - $290k

Perplexity AI

The Agent Capabilities team at Perplexity Computer is at the forefront of agentic AI, bridging frontier AI research with product innovation. This team builds the foundational capabilities that empower users and agents to tackle increasingly complex tasks. They are responsible for translating cutting-edge AI model breakthroughs into reusable product features, evaluating emerging model capabilities, identifying user value, and transforming these into reliable, scalable, high-quality experiences. This role offers broad ownership at the intersection of AI research, agent systems, platform engineering, and product innovation.

$220k - $405k

We are seeking a Senior PHY Software Engineer with over 10 years of experience in cellular PHY software development, integration, debugging, and system troubleshooting across 2G, 4G, and 5G technologies. This role will focus on PHY development and issue resolution. A key aspect of this position involves contributing to an AI-assisted development initiative, specifically building and fine-tuning AI-based tools and agents for PHY log and crash analysis to enhance engineering productivity and root cause analysis capabilities. The ideal candidate will be a strong PHY domain expert and problem solver, adept at identifying root causes by correlating evidence across various sources and layers, going beyond linear debugging.

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Parallel Wireless is seeking a skilled wireless systems engineer to lead the development of a multi-RAT digital twin for their Open RAN solution. This role involves executing production RAN software within a closed-loop simulation environment, enabling engineering teams to design, evaluate, and compare features for LTE, 5G NR, and 2G without the need for physical radio setups. The position is a senior individual contributor role at the intersection of wireless systems, simulation, production software, and AI/ML, focused on evolving an existing simulator into a scalable platform for feature development, testing, and optimization.

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TRM Labs

TRM Labs is seeking a Senior Software Engineer to join their AI team, focusing on enhancing intelligence collection through AI-powered solutions. This role involves working directly with intelligence analysts to understand their workflows and build AI products, tooling, and infrastructure that improve efficiency and scale. The ideal candidate will have strong product sense, the ability to identify high-impact solutions, and a desire to stay deeply technical while shaping product direction. You will be responsible for designing, building, and owning AI-powered internal applications end-to-end, from backend services and APIs to the underlying infrastructure and user interfaces. This is a hands-on position for an engineer who wants to make a significant impact on the mission of building a safer world.

$200k - $220k

TRM Labs

TRM Labs is seeking a Senior Software Engineer to join their AI team, focusing on enhancing intelligence collection with AI-powered solutions. This role involves working closely with intelligence analysts to understand their needs and build AI products, tooling, and infrastructure that improve efficiency and scale. The ideal candidate will have strong product sense, a desire to stay deeply technical, and the ability to identify and build high-impact, scalable AI solutions rather than narrow automations. You will design, build, and own AI-powered internal applications end-to-end, including back-end services, APIs, data storage, and infrastructure, and develop custom agentic solutions leveraging state-of-the-art models.

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Composio

This is an applied AI engineering role focused on building customer-facing AI solutions. You will work directly with customers to understand their recurring problems and develop agentic systems to automate those tasks. This involves debugging and shipping solutions when direct engineering is required, and transforming repeated issues into robust workflows, evaluations, tools, or product capabilities. The role offers a unique opportunity to work at the frontier of applied AI, designing systems that gather context, reason across different platforms, utilize tools, take bounded actions, verify outcomes, and communicate effectively. You will also be responsible for defining the necessary state, permissions, guardrails, evaluations, and escalation paths to ensure AI systems earn customer trust, and for implementing immediate feedback loops to continuously improve these systems based on real-world support cases.

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Swayable

Swayable is a fast-growing AI and automated data science platform that measures public opinion and the impact of messages and advertising content on it. We are a 40-person team backed by top technology and social impact investors, including Y Combinator. The Director of AI will be a builder, researcher, developer, and thought-partner to the CEO and CTO, responsible for discovering, prototyping, and proving out high-value applications of cutting-edge AI across business operations, product, and fundamental research. This role offers a unique opportunity to leverage significant resources, including a large dataset of RCT survey experiment results, an established team of engineers and scientists, academic partnerships, and direct access to enterprise customers for rapid product development.

$175k - $250k

Eventual is building data curation for Physical AI, processing petabyte-scale video and sensor data to extract crucial signals for training frontier AI models. The company's mission is to empower Physical AI and robotics teams to instantly find, curate, and stream the data they need. As a Software Engineer on the Data Systems team, you will build key capabilities for a high-throughput data engine over petabytes of video, lidar, and telemetry data, working directly on the architecture for real-time indexing, distributed storage/compute, and efficient dataloading to GPUs. This role offers high ownership across the stack in an agile, fast-paced startup environment.

$150k - $200k

Typeface

We help the world's biggest brands move from brief to fully personalized campaigns — in days, not months. Founded by Abhay Parasnis and backed by Microsoft, GV, Salesforce, Lightspeed, Madrona and Menlo, we’re building category-defining technology at the intersection of creativity and AI with real impact. Join us to help shape the future of enterprise marketing. As a Senior Full stack Engineer, you will be responsible for building features end-to-end, working closely with cross-functional teams including product, design, marketing, and data science to design and develop features. We are looking for strong full stack engineers across multiple levels to join our team and help us build innovative web applications and cloud services that deliver the power of generative AI to our customers.

$160k - $200k

As a Forward Deployed Engineer at Handshake AI Enterprise, you will embed directly within enterprise customer environments as part of a small, expert team. Your role will involve deeply understanding each customer's business, including their workflows and bottlenecks, to translate this knowledge into production-grade AI agents that measurably transform their operations. This is a full-stack ownership role, encompassing solution definition, agent building and deployment, evaluation design, and iterative performance improvement. You will develop into a genuine domain expert within your customer's vertical, leveraging this expertise to continuously enhance AI capabilities.

$155k - $170k

Artos

Artos is seeking a talented, startup-minded engineer to accelerate the development of their R&D documentation platform for biopharma companies. As a core member of the engineering team, you will play a critical role in building, scaling, and expanding the Artos platform. You will work across the full stack, developing intuitive product experiences, robust backend systems, and AI-powered workflows that help life sciences companies bring life-saving treatments to patients faster. This role offers meaningful ownership over both the product and the technology, working on challenging problems at the intersection of AI, enterprise software, and life sciences.

$190k - $260k