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Spark: AI-Powered Renewable Energy Infrastructure

2025-06-28
Spark: AI-Powered Renewable Energy Infrastructure

Spark is building the AI engine powering the next generation of renewable energy infrastructure. Their mission is to help renewable energy developers build solar farms, battery storage, and related projects more efficiently. They're already working with industry leaders like Colliers Engineering & Design and Standard Solar, and are backed by top-tier investors including AI Grant and Y Combinator. They're hiring software engineers with 3+ years of experience, full-stack skills, and a passion for AI and clean energy.

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(www.ycombinator.com)
Tech

SigNoz: Open Source Application Monitoring Dev Advocate Wanted

2025-06-27
SigNoz: Open Source Application Monitoring Dev Advocate Wanted

SigNoz, a global open-source application monitoring project with 21,000+ GitHub stars and 6,000+ Slack community members, is hiring a Developer Advocate. This role involves engaging with the community, creating dev-focused blogs and videos, presenting SigNoz at meetups and conferences, and assisting users with setup and use cases. You'll work on a global dev infra product, engage with the open-source community, and be backed by YC and prominent US VCs. Requires 1+ years of software engineering experience, familiarity with various programming languages and deployment methods (e.g., k8s, Docker), active participation in developer communities, and knowledge of cloud-native ecosystems, Kubernetes, and OpenTelemetry is a plus.

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(www.ycombinator.com)
Development developer advocate

AccessOwl Hiring: Senior Elixir Engineer (Remote, AI-Driven SaaS)

2025-06-26
AccessOwl Hiring: Senior Elixir Engineer (Remote, AI-Driven SaaS)

AccessOwl, a profitable, Y Combinator-backed SaaS startup, is seeking a Senior Software Engineer specializing in Elixir. This fully remote role requires a location within ±3 hours of Berlin. You'll collaborate with a small, close-knit team to revolutionize how companies manage their SaaS tools using AI. The ideal candidate has 5+ years of web software development experience, is proficient in Elixir, and thrives on solving real-world problems. Competitive salary, stock options, and flexible hours are offered.

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(www.ycombinator.com)
Development

AI Revolutionizes Video Creation: Yarn is Hiring Top Engineers

2025-06-25
AI Revolutionizes Video Creation: Yarn is Hiring Top Engineers

Yarn, a startup, is revolutionizing video creation with AI. Their innovative technology combines AI with video production, making compelling videos 100x faster. Backed by investors like Y Combinator and collaborating with companies like Clay and Shopify, Yarn is hiring experienced engineers in NYC. They're looking for individuals to build core agent workflows, develop AI-powered collaborative editing tools, and prototype cutting-edge AI models.

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(www.ycombinator.com)
Development Video Production

Kastle: Founding Engineer for AI-Powered Mortgage Servicing

2025-06-22
Kastle: Founding Engineer for AI-Powered Mortgage Servicing

Kastle is seeking a Founding Engineer to build and optimize its AI infrastructure. They use AI voice agents to help major US mortgage lenders scale their contact centers and compliance operations, backed by $2.3M in funding. This role requires backend development, distributed systems, and AI integration expertise. Responsibilities include developing scalable backend services, APIs integrating with loan servicing platforms, and ensuring compliance with financial regulations (SOC 2, FDCPA, RESPA, TILA).

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(www.ycombinator.com)
Development Mortgage

Weave is Hiring its Founding AI Engineer!

2025-06-21
Weave is Hiring its Founding AI Engineer!

Well-funded startup Weave seeks a phenomenal AI engineer to build AI that understands and improves software engineering workflows. Reporting directly to the CTO and CEO, you'll build processes and standards from the ground up, aiming to create a product that delights customers by making their jobs 10x easier. They value potential and grit over specific skills; must-haves include pragmatism, empathy, excellent communication, and a commitment to growth. Experience with React, TypeScript, Go, or Python is a plus. Join a rapidly growing, profitable team!

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(www.ycombinator.com)
AI Software Engineering Productivity

QFEX is Hiring a Founding Backend Engineer

2025-06-20
QFEX is Hiring a Founding Backend Engineer

QFEX, a fintech company processing billions of dollars in daily trading volume, seeks a founding backend engineer. The role requires experience with high-performance languages (like C++), 3+ years building and running high-traffic, real-time production systems. Responsibilities include designing fault-tolerant, low-latency, high-availability services; setting up CI/CD and monitoring; and guiding technical direction. Ideal candidates possess fintech or low-latency experience, Kubernetes/IaC familiarity, and exceptional responsibility and decision-making skills.

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(www.ycombinator.com)
Development

AI-Powered Quant Trading Lab: Bridging Theory and Practice

2025-06-18
AI-Powered Quant Trading Lab: Bridging Theory and Practice

A research lab is building an AI-driven quantitative trading system leveraging the complex, data-rich environment of financial markets. Using first principles, they design systems that learn, adapt, and improve through data, with infrastructure built for rapid iteration, real-time feedback, and a direct link between theory and execution. Initially focusing on liquid markets like equities and options, their aim transcends better modeling; they seek a platform for experimentation where every result refines the theory-practice loop.

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(www.ycombinator.com)
AI AI Quant Trading Financial Markets

Foundry: Enabling AI Agents to Master Web Browsers

2025-06-17
Foundry: Enabling AI Agents to Master Web Browsers

Foundry, a San Francisco-based startup, is building infrastructure that allows AI agents to use web browsers just like humans. They're tackling the current limitations of AI agents interacting with enterprise applications (like Salesforce and SAP), such as frequent stalling and extensive manual debugging. Foundry employs a similar strategy to Waymo and Scale AI, building robust infrastructure for rapid performance improvements in AI agents, aiming to make AI-powered automation more reliable and practical. They're actively recruiting elite engineers passionate about delivering foundational technology quickly.

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(www.ycombinator.com)
AI

YC-Backed Fintech Startup Blaze Hiring AI-Driven Software Engineer

2025-06-16
YC-Backed Fintech Startup Blaze Hiring AI-Driven Software Engineer

Blaze, a YC-backed fintech startup in Mexico City, is hiring a Junior Software Engineer. The role involves leveraging AI tools like Cursor to accelerate the development of their payment platform's front-end and back-end. Ideal candidates will possess strong JavaScript, React, and AI development tool knowledge, and a passion for fintech. Blaze offers competitive compensation, equity, and the opportunity to grow in a fast-paced environment.

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(www.ycombinator.com)
Development

Kyber: Hiring a Technical Account Manager for its AI-Powered Document Platform

2025-06-13
Kyber: Hiring a Technical Account Manager for its AI-Powered Document Platform

Kyber is hiring a Technical Account Manager to drive customer success for its AI-native enterprise document platform. Kyber's platform helps insurance companies consolidate 80% of their templates, reduce drafting time by 65%, and compress communication cycles by 5x. The company has seen 20x revenue growth and achieved profitability in the last 8 months, and has established strategic partnerships with industry leaders like Guidewire, Snapsheet, and PCMS. The role requires experience with enterprise SaaS products, excellent communication skills, and strong problem-solving abilities.

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(www.ycombinator.com)
Startup

Roundtable: Hiring a Business Leader to Build the Proof-of-Human Layer

2025-06-12
Roundtable: Hiring a Business Leader to Build the Proof-of-Human Layer

Roundtable, a research and deployment company, is building the proof-of-human layer in digital identity. They are looking for a business leader to join their C-suite and drive commercial growth. The role involves designing, managing, and executing the company's commercial strategy, including top-of-funnel and pipeline management, sales calls, and customer success. The ideal candidate is comfortable in both sales and product contexts and has experience building a commercial operation in the tech industry, though technical expertise isn't required.

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(www.ycombinator.com)
Startup business development

Roame is Hiring a Lead Full-Stack Engineer to Revolutionize Points-Based Travel with AI

2025-06-12
Roame is Hiring a Lead Full-Stack Engineer to Revolutionize Points-Based Travel with AI

Roame, a flight search engine leveraging credit card points and miles, backed by Y Combinator and other top investors, seeks a Lead Full-Stack Engineer. This hands-on role requires experience with Next.js, Firebase, and Go, and involves building the entire frontend and contributing to the backend. The ideal candidate is passionate about travel, points optimization, and AI, thriving in a fast-paced startup environment. The position offers competitive salary, equity, and benefits, including free lunches and company offsites.

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(www.ycombinator.com)
Development Travel Points

SchemeFlow: Full-Stack Engineer Wanted (Y Combinator Backed)

2025-06-12
SchemeFlow: Full-Stack Engineer Wanted (Y Combinator Backed)

SchemeFlow, a Y Combinator-backed AI startup in London, is seeking a highly skilled Full-Stack Engineer. The company uses AI to streamline the bureaucratic process of building projects, aiming to accelerate infrastructure development in the West. The ideal candidate will have strong full-stack experience (Vue.js, FastAPI, Google Cloud, Supabase, etc.) and a deep understanding of user needs. Competitive salary, equity, and potential relocation to San Francisco are offered.

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(www.ycombinator.com)
Development

Shaped is Hiring a Head of Engineering

2025-06-11
Shaped is Hiring a Head of Engineering

Shaped is seeking a Head of Engineering to scale its engineering organization and drive the technical vision of its products. The ideal candidate will have 8+ years of software engineering experience, a B.S., M.S., or Ph.D. in Computer Science or a related field, and excellent communication and problem-solving skills. Responsibilities include defining technical strategy, managing teams, overseeing product development, cross-functional collaboration, and process and infrastructure optimization. This is a leadership opportunity to shape the product roadmap and ensure platform reliability and scalability.

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(www.ycombinator.com)
Development Head of Engineering Technical Leadership

SF Startup Hiring: Backend Engineer for 100M+ Datapoint Automation

2025-06-11
SF Startup Hiring: Backend Engineer for 100M+ Datapoint Automation

A San Francisco Bay Area startup seeks a recent graduate to join its backend engineering team building production automation systems processing 100M+ data points monthly. You'll work on real-world systems, learning from senior engineers and contributing meaningfully from day one. Responsibilities include building Python services for automated data collection, integrating systems, handling errors, ensuring reliable data pipelines, creating internal tools, and production debugging. Ideal candidates possess strong programming fundamentals, Python experience, problem-solving skills, and DevOps/sysadmin interest. Excellent benefits include lunch, unlimited PTO, 401k, platinum health insurance, and a $100K-$120K salary with equity.

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(www.ycombinator.com)
Development

NYC Startup Seeks Founding Engineer: AI-First, Full-Stack Whiz Needed

2025-06-07
NYC Startup Seeks Founding Engineer: AI-First, Full-Stack Whiz Needed

A NYC startup is searching for a full-time founding engineer to build new products from the ground up. This critical role offers significant equity and product ownership. The ideal candidate will be a full-stack expert proficient in Next.js, React, Vercel, and Supabase, able to iterate quickly, and possess a strong understanding of integrating AI systems into SaaS products. Bonus points for SQL database familiarity, multi-tenancy database design experience, web scraping skills, and React Native expertise.

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(www.ycombinator.com)
Development

Onyx Hiring First Account Executive to Fuel Generative AI Workplace Revolution

2025-06-06
Onyx Hiring First Account Executive to Fuel Generative AI Workplace Revolution

Onyx, a generative AI platform connecting to your company's docs, apps, and people, is hiring its first Account Executive. Backed by $10M in seed funding from top-tier VCs and boasting clients like Netflix and Ramp, Onyx is seeking a seasoned sales professional (5+ years experience in mid-market or enterprise software sales) to spearhead its GTM strategy. This high-impact role involves managing the full sales cycle, pipeline generation, and collaborating across functions to build and refine sales processes. A unique opportunity for those wanting to shape sales at a rapidly growing startup.

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(www.ycombinator.com)
Startup Account Executive

AI-Powered Customer Success: Great Question Hiring Director of Customer Success (North America)

2025-06-06
AI-Powered Customer Success: Great Question Hiring Director of Customer Success (North America)

Great Question, a Series A B2B SaaS company backed by top-tier investors, is seeking a Director of Customer Success based in North America. This role will lead post-sale strategy and execution, driving revenue growth, building scalable systems, and guiding the CS team through a new phase of growth. The ideal candidate will have a proven track record leading CS teams in high-growth B2B SaaS environments, experience serving enterprise customers, and strong commercial acumen. Competitive salary and benefits are offered, along with the opportunity to make a real impact in the world of AI-powered customer feedback.

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(www.ycombinator.com)
Startup

Exa: Building the Next-Gen AI Chips for AGI

2025-06-06
Exa: Building the Next-Gen AI Chips for AGI

Exa is developing next-generation polymorphic chips aiming to surpass NVIDIA, forming the foundation for future knowledge and scientific discovery. Their XPU chips self-reconfigure to optimize model dataflow, enabling AGI and ASI support with dramatically reduced energy consumption. They're seeking experienced engineers to join their team and build this revolutionary technology with a legacy spanning centuries.

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(www.ycombinator.com)
Tech polymorphic architecture

PromptArmor: Breaking LLMs and Building the Future of AI Security

2025-06-04
PromptArmor: Breaking LLMs and Building the Future of AI Security

PromptArmor is a startup focused on AI security, specializing in breaking large language model (LLM) applications to build robust defenses. They serve major American enterprises, helping them securely accelerate their AI adoption. The team boasts experience from companies like Google and Tesla, and is backed by top investors including Y Combinator. They emphasize a customer-centric approach and offer competitive compensation, including a base salary of $120k-$180k and 0.75%-2% equity. Located in San Francisco, they're seeking engineers with strong technical skills and product sense to join their team.

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(www.ycombinator.com)
Startup

Depot: Blazing Fast Software Builds, Hiring First Enterprise Support Engineer

2025-06-04
Depot: Blazing Fast Software Builds, Hiring First Enterprise Support Engineer

Depot is a build acceleration platform that saves companies thousands of hours in build time weekly by integrating with tools like GitHub Actions and Docker. They're hiring their first Enterprise Support Engineer to provide technical support and expertise in CI/CD optimization, Docker, and various build tools. The ideal candidate has DevOps experience, strong communication skills, and a working knowledge of CI/CD platforms and Docker. This role involves customer interaction, troubleshooting, and assisting with migrations to the Depot platform.

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(www.ycombinator.com)
Development

Hiring: High-Energy Engineer to Productionize AI Agents

2025-06-04
Hiring: High-Energy Engineer to Productionize AI Agents

A company is seeking a high-energy, resourceful engineer to make AI agents production-ready. The role involves building accurate, reliable, and secure AI agents using cutting-edge models and frameworks. While there are no hard requirements, ideal candidates possess experience with AI-native development workflows, a proven track record of product launches, strong communication skills, and a collaborative spirit. Applicants must submit a one-minute video introducing themselves and highlighting a passion. AI-generated videos or applications without a video will not be considered.

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(www.ycombinator.com)
Development

Senior Backend Engineer Wanted: Defend the Brain Battlefield

2025-06-02
Senior Backend Engineer Wanted: Defend the Brain Battlefield

Piramidal is seeking a seasoned software engineer to build and maintain the backend infrastructure for its flagship neural data platform. The ideal candidate has 5+ years of experience at product-driven companies, proficiency in Python and other backend languages, containerization/orchestration (e.g., Kubernetes), relational databases (e.g., Postgres/MySQL), and web technologies (e.g., JavaScript, React). They will collaborate closely with ML engineers and internal customers, creating secure, efficient, and delightful user interactions and automations. The company is dedicated to using technology to maximize human potential, defending cognitive liberty, and opposing the commodification and manipulation of minds.

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(www.ycombinator.com)
Development Neural Data Platform Architecture

AccessOwl Hiring: Senior Software Engineer (TypeScript, AI, Remote)

2025-05-31
AccessOwl Hiring: Senior Software Engineer (TypeScript, AI, Remote)

AccessOwl, a profitable Y Combinator-backed startup, seeks a Senior Software Engineer to build and maintain its SaaS tool management platform's integration layer. Ideal candidates are fluent in TypeScript and AI-native, experienced with Playwright or Puppeteer, familiar with IaC, and passionate about solving real-world problems. The role offers a competitive salary, fully remote work, and flexible hours.

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(www.ycombinator.com)
Development

Stack AI Hiring 10x Frontend Engineers to Democratize AI

2025-05-30
Stack AI Hiring 10x Frontend Engineers to Democratize AI

Stack AI, a Y Combinator and Gradient Ventures-backed AI startup founded by two MIT PhDs, is looking for 10x frontend engineers! They're building a user-friendly, no-code platform that democratizes access to large language models, enabling anyone to build impactful AI applications. Integrating top AI models (OpenAI, Anthropic, Google) and various data sources, Stack AI boasts over 85,000 users and 300+ paying customers. The role requires proficiency in React, TypeScript, and a strong UX focus. If you're passionate about AI and thrive in a dynamic startup environment, this is your chance to make a real impact.

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(www.ycombinator.com)
Development

Infisical is Hiring: Build the Future of Open Source Security for the AI Era

2025-05-29
Infisical is Hiring: Build the Future of Open Source Security for the AI Era

Infisical, the open-source security infrastructure platform backed by Y Combinator, Google, and Elad Gil, is seeking exceptional full-stack engineers. They're building the open-source security infrastructure stack for the AI era, managing secrets, internal PKI, key management, and SSH workflows. The team boasts experience from companies like Figma, AWS, and Red Hat and offers competitive compensation and benefits. Ideal candidates possess deep JavaScript expertise (React.js, Node.js, TypeScript), a strong work ethic, and a passion for learning. You'll develop and maintain platform features, expand product lines (Infisical PKI, SSH, KMS), and explore AI applications in security. Join a mission to simplify security for developers, starting with secrets management.

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(www.ycombinator.com)
Development

Hybrid R&D Engineer: Half Research, Half Engineering

2025-05-27
Hybrid R&D Engineer: Half Research, Half Engineering

This isn't your typical early-stage startup Founding Engineer role. It's a 50/50 split between research and engineering. While experience in both is ideal, a strong quantitative background and a thirst for learning can compensate for a lack of research experience. Proficiency in web development (Javascript, Node.js) and Python is mandatory. The work is open-ended and requires comfort with uncertainty; expect many failed experiments. However, you'll enjoy significant autonomy and the freedom to tackle problems as you see fit. This role is perfect for those who thrive on freedom and challenge.

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(www.ycombinator.com)
Development R&D Engineer

Diligent: Hiring Founding AI Engineer to Revolutionize Fintech Risk

2025-05-27
Diligent: Hiring Founding AI Engineer to Revolutionize Fintech Risk

Diligent, a Y Combinator startup, uses AI to automate due diligence for fintechs and banks. They're seeking a Founding AI Engineer to build core agent frameworks, innovate LLM applications in financial services, and directly collaborate with clients. The ideal candidate is a problem-solver with strong coding, system design, and architecture skills, and a passion for language models. Competitive salary, equity, and a fast-paced environment are offered.

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(www.ycombinator.com)
AI

Venta AI: Hiring a Full-Stack Engineer (YC-backed)

2025-05-26
Venta AI: Hiring a Full-Stack Engineer (YC-backed)

YC-backed Venta AI, building AI employees for sales teams, is hiring a full-time, on-site full-stack engineer in Amsterdam. The ideal candidate will have significant experience in full-stack development, expertise in TypeScript, React, Remix (preferred), Python and FastAPI, proficiency in designing multi-tenancy SaaS products, and experience with AI code IDEs (Cursor, Windsurf, Claude, etc.). Scalable software operation experience is crucial. Fluency in English is required, with German a plus. Venta AI, funded by Y Combinator and Google's AI fund, is making AI accessible, compliant, and transparent for European businesses.

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(www.ycombinator.com)
Development
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