Staff Software Engineer - Event Sourcing & Stream Processing with Kafka

About Us:At LangChain, we are on a mission to make intelligent agents commonplace. Our platform serves as the backbone for agent engineering in real-world applications, enabling developers to transform their prototypes into production-ready AI agents that organizations can depend on. Initially recognized for our widely adopted open-source tools, we have evolved to also provide a comprehensive platform for building, evaluating, deploying, and managing agents at scale.Today, our solutions including LangChain, LangGraph, LangSmith, and Agent Builder are utilized by teams delivering genuine AI products across both startups and large enterprises. Millions of developers rely on LangChain to empower AI teams at prominent companies such as Replit, Clay, Coinbase, Workday, Lyft, Cloudflare, Harvey, Rippling, Vanta, and 35% of the Fortune 500.With $125 million raised in Series B funding from leading investors including IVP, Sequoia, Benchmark, CapitalG, and Sapphire Ventures, we are in an exciting phase of product development, experiencing rapid growth where every team member can significantly influence our projects and collaborative work culture. At LangChain, your contributions can reshape how technology manifests in the real world.About the Role:We are seeking a dedicated core maintainer to join the LangChain team. This individual will play a crucial role in enhancing and maintaining the LangChain JavaScript package. Preference will be given to candidates who can work in person in San Francisco.Enhancing the core abstractions and runtime of the langchain and langgraph packagesImproving and expanding documentationResponding to user inquiries and resolving issues effectivelyUtilizing langchain to develop example applicationsSuccess Factors:Minimum of 3 years of experience in software engineering or applied machine learningStrong background in Software EngineeringExceptional written and verbal communication skills, capable of conveying technical concepts to both technical and non-technical audiencesAbility to thrive in a fast-paced environment and view unstructured settings as opportunities to define impactful workOwnership mindset; proficient at managing tasks independently and effectively

About LanceDBLanceDB is an innovative, developer-centric, open-source database designed for multimodal AI applications. We provide robust solutions ranging from hyper-scalable vector search capabilities to advanced retrieval for Retrieval-Augmented Generation (RAG). LanceDB is your ideal partner for creating AI applications, enabling seamless interaction with large-scale AI datasets and powering some of the most cutting-edge applications across various industries.About the RoleWe are seeking a Senior Open Source Engineer to enhance the presence of LanceDB within the extensive data infrastructure ecosystem. You will engage in projects that sit at the convergence of high-performance computing, big data, and open-source systems. Your contributions will drive integrations, optimize distributed operations, and support initiatives within the Apache and AI communities.Key ResponsibilitiesLead open-source community initiatives to integrate the Lance format with systems such as Spark, Hive Metastore, Presto, Trino, and Ray.Design and sustain efficient distributed operations for Lance datasets.Develop optimized indices to facilitate predicate pushdown and enhance query performance in Spark, Ray, or Trino.Engage in the development of table formats, data encodings, and various components of the Lance format using Rust.Manage and enhance internal data processing infrastructure.Advocate for the Lance format in open-source forums and at major Big Data conferences.RequirementsOver 10 years of experience in developing high-performance databases, big data systems, or large-scale data services.In-depth knowledge of the internal workings of open-source Big Data or AI training systems such as Hadoop, Spark, Flink, Ray, Iceberg, Delta Lake, Hudi, ClickHouse, Trino, Presto, PyTorch, or JAX.Extensive experience with high-performance computing using Java or Scala.Familiarity with Rust is preferred, or a strong willingness to learn.Demonstrated ability to work efficiently, independently, and collaboratively within a high-caliber team environment.Preferred QualificationsActive contributor, committer, or PMC member in Apache or other significant open-source projects.Experience with Java, Rust, C++, Apache Arrow, DataFusion, Parquet, Iceberg, or Delta Lake is a plus.

About Us:At LangChain, we are on a mission to revolutionize the world of intelligent agents. Our innovative platform empowers developers to transition from initial prototypes to production-ready AI agents that can be trusted by their teams. Originating from widely embraced open-source tools, we have since expanded to offer a comprehensive suite for building, assessing, deploying, and managing AI agents at scale.Today, our tools—LangChain, LangGraph, LangSmith, and Agent Builder—are utilized by teams delivering genuine AI solutions across both startups and major enterprises. Millions of developers rely on LangChain to enhance AI capabilities for companies such as Replit, Clay, Coinbase, Workday, Lyft, Cloudflare, Harvey, Rippling, Vanta, and 35% of the Fortune 500.With a successful $125M Series B funding from esteemed investors including IVP, Sequoia, Benchmark, CapitalG, and Sapphire Ventures, we are in an exciting phase of product development and growth. Every team member has a significant opportunity to influence the technology we create and how we collaborate. At LangChain, your contributions will directly shape the future of AI.About the Role:On-site 5 days/week in San Francisco, CA or Boston, MA (San Francisco preferred)We are seeking a dedicated core maintainer to join our LangChain team. This individual will be instrumental in enhancing and maintaining the LangChain Python package.Enhancing the core abstractions and runtime of the langchain and langgraph packagesImproving our documentationProviding answers to user inquiries and resolving issuesUtilizing langchain to develop example applicationsSuccess Factors for This Role:5+ years of experience in software engineering or applied machine learningExcellent written and verbal communication skills, capable of conveying technical concepts clearly to both technical and non-technical stakeholdersAbility to thrive in a fast-paced environment, viewing unstructured situations as opportunities to identify impactful work and define the company’s future successOwnership mentality, demonstrating a proactive approach to work

Join Arena Intelligence as a Machine Learning ScientistAt Arena Intelligence, we are revolutionizing how AI models are evaluated in real-world scenarios. Founded by innovative researchers from UC Berkeley’s SkyLab, our mission is to push the boundaries of AI evaluation and ensure its practical application.With millions of users engaging with our platform each month, we prioritize community feedback to develop transparent, rigorous, and human-centered model evaluations. Our leaderboards serve as the benchmark for AI performance, gaining the trust of leading enterprises and AI labs to understand the reliability, alignment, and impact of AI systems.Our diverse team comprises experts from esteemed institutions such as UC Berkeley, Google, Stanford, DeepMind, and Discord. We foster a culture that values truth, agility, craftsmanship, curiosity, and impact over hierarchy. We are committed to creating an environment where talented individuals from all backgrounds can excel in their work.Role OverviewWe are seeking a passionate Machine Learning Scientist to spearhead our open-source research initiatives, including the development of open datasets and code releases. You will be instrumental in advancing how AI models are evaluated and understood globally.In this position, you will operationalize our dedication to openness by curating impactful datasets, developing innovative methodologies, and establishing reproducible benchmarks. Your contributions will enhance our public leaderboards, empower community tools, and promote transparency in AI evaluation on a global scale.This interdisciplinary role involves collaboration with engineers, product teams, marketing, and the broader research community to refine model comparisons, analyze preference data, and explore dimensions like style, reasoning, and robustness. You will also work closely with our go-to-market teams to advocate for our open research initiatives, strengthen research partnerships, and encourage community engagement.If you are excited by complex challenges, rigorous evaluation processes, and scientific outreach, we invite you to apply!

About OmniOmni is an innovative business intelligence and embedded analytics platform designed to empower organizations in exploring, understanding, and acting on their data effectively.With our headquarters in San Francisco and operational hubs across EMEA and APAC, we are proud to be supported by top-tier investors such as ICONIQ Growth, Theory Ventures, First Round Capital, Redpoint Ventures, Google Ventures, Snowflake Ventures, and Databricks Ventures.About the RoleAs a Software Engineer at Omni, you will engage with our entire technology stack to tackle diverse customer challenges. Collaborating with a highly skilled team, you will have the freedom to prioritize tasks and resolve issues independently or collectively.Your primary focus will be on developing user experiences, APIs, and data processing functionalities within our TypeScript application, leveraging the React and Remix frameworks.Our engineering culture prioritizes rapid, iterative shipping while upholding rigorous standards for performance and quality. Recent projects have included:Comprehensive spreadsheets integrated within our BI platform.A Managed Cloud Platform (MCP) server for Blobby, our AI chatbot that crafts queries within the boundaries of a semantic data model.CSV upload functionalities.APIs for various applications.Data writing capabilities to Google Sheets.QualificationsExceptional technical and communication skills.3-10+ years of experience in building production-level software with proficiency in TypeScript or JavaScript.Strategic mindset with the ability to align business and product objectives with development speed and engineering excellence.Proficiency in analytical tools such as SQL, Looker, Tableau, Mode, Amplitude, or Google Analytics.Preferred Qualifications:Experience in developing data products.Familiarity with data warehousing solutions like Snowflake, BigQuery, or Redshift.Knowledge of data use cases and the analytics ecosystem.Our Technology Stack:TypeScriptReact with RemixKotlin / JavaAWSWhy Join UsBe part of a dynamic and innovative team.Opportunity for professional growth and advancement.Contribute to exciting projects that make a real impact.

Join Airbnb as the Manager of Strategic Sourcing for Engineering & Infrastructure, where you will play a vital role in advancing our procurement strategies and optimizing supplier relationships. This position entails leading a team dedicated to sourcing high-quality materials and services that align with our operational goals. You will leverage your expertise in negotiation and supplier evaluation to drive value and efficiency across our engineering initiatives.

The OpportunityJoin us as a pivotal contributor to ComfyUI, one of the most renowned open-source projects today, and help shape the future of creative tools and workflow engines.Your primary objective will be to design and implement robust software foundations that drive our engineering efforts, including creating clean software abstractions, developing extensible RESTful APIs and Python SDKs, and ensuring high standards of code quality. The impact of your design decisions will significantly influence the project's trajectory, necessitating meticulous attention to detail and strategic thinking.Key Projects You Will Tackle:Creating adaptable abstractions that accommodate future developments, such as the concept of subgraphs within a graph.Crafting scalable data models that thrive in an open-source ecosystem.Introducing innovative core types like VIDEO or 3D.Collaborating with product designers and frontend engineers to deliver user-facing features that seamlessly function in headless environments, as many users utilize ComfyUI as an API service.Ideal Candidate Profile:Proficient in Python with experience in maintaining scalable APIs and SDKs.Consistently writes and reviews code, upholding high-quality standards.Passionate about elegant software design and the principles of clean coding.Bonus: Familiarity with ComfyUI or other node-based workflow tools.Bonus: Strong knowledge of tensors, PyTorch, and the ability to contribute to implementing new models for ComfyUI.About ComfyUIComfyUI is the leading visual AI platform—an open and modular system where users can construct, customize, and automate AI workflows with precision and full control.Unlike conventional AI tools that conceal their mechanisms behind simple prompts, ComfyUI empowers professionals to design their own pipelines, connecting models, tools, and logic visually akin to building blocks.Our platform is utilized by artists, filmmakers, game developers, designers, researchers, VFX studios, and teams from top-tier companies like OpenAI, Netflix, Amazon Studios, Ubisoft, EA, and Tencent—enabling them to transcend presets and truly influence AI creation.

Join Us as a Senior JavaScript UI Engineer (React or Angular) - $160K-$180K.HIGHLIGHTS:* Be a key player in crafting a new, frontend-centric, feature-rich Software as a Service (SaaS) product.* Work on a distinctive, powerful suite of applications designed for web design and development.* Join a well-funded company (Series A funding of $15 million) that’s making waves in the industry.* Become part of a growing team with esteemed Fortune 500 clients including GE, Visa, and Marriott.* Located in SOMA, San Francisco, 94107, with convenient access to BART and Caltrain, plus a flexible work schedule..THE ROLE:* As our most senior frontend developer, you will report directly to the CTO.* Utilize cutting-edge technologies: React, Redux, Apollo, ES6/ESNext, Cypress for browser testing, GraphQL for API interaction, and Flow for type safety.* Develop complex frontend features while enhancing performance and speed using Chrome Dev Tools..IDEAL CANDIDATE PROFILE:* 10+ years of JavaScript experience required.* Proficiency in MVC frameworks such as AngularJS and ReactJS.* Proven track record in building complex public-facing frontends.* A passion for learning the latest tools and methodologies.

At Prime Intellect, we are pioneering the development of an open superintelligence framework, encompassing everything from cutting-edge agentic models to the infrastructure that empowers individuals to create, train, and deploy these advanced systems. Our innovative platform consolidates global computational resources into a unified control plane and integrates a comprehensive Reinforcement Learning (RL) post-training suite: including environments, secure sandboxes, verifiable evaluations, and our asynchronous RL trainer. We provide researchers, startups, and enterprises with the tools necessary to execute end-to-end reinforcement learning at the forefront of technology, seamlessly adapting models to real-world applications, workflows, and deployment scenarios.We are eager to connect with individuals who have successfully crafted intricate technical systems, made significant contributions to open-source initiatives, or who possess expertise across diverse domains. Whether your specialization lies in AI, distributed computing, cryptography, systems programming, or an unconventional area, your ability to learn rapidly, think critically, and execute effectively is what we value most.Recently, we secured $15 million in funding (bringing our total to $20 million), spearheaded by Founders Fund, with contributions from Menlo Ventures and notable angels such as Andrej Karpathy (Eureka AI, Tesla, OpenAI), Tri Dao (Chief Scientific Officer of Together AI), Dylan Patel (SemiAnalysis), Clem Delangue (Huggingface), Emad Mostaque (Stability AI), among others.We invite you to share your enthusiasm for Prime Intellect, highlight an impressive project you’ve undertaken, and describe how you envision advancing open and decentralized AGI.

Join Oura as a Senior Sourcing Manager specializing in Battery technologies. In this pivotal role, you will drive sourcing strategies, enhance supplier relationships, and ensure our products meet the highest quality standards. You will collaborate with cross-functional teams to optimize supply chain efficiency and contribute to the development of cutting-edge battery solutions.

Join our dynamic team at BCforward as a JavaScript Software Developer. We are looking for a talented developer who is passionate about building innovative applications and enhancing user experiences. In this role, you will collaborate with cross-functional teams to design, develop, and implement web applications using JavaScript frameworks.

About Tenable:Tenable® is at the forefront of Exposure Management, empowering over 44,000 organizations globally to comprehend and mitigate cyber risks. Our dedicated team supports a diverse clientele, including 65% of the Fortune 500 and numerous government agencies. Join us on our exciting journey!Why Choose Tenable?Our employees are our greatest asset! We collaborate to create and innovate cutting-edge cybersecurity solutions while fostering a culture of inclusion, respect, and excellence. As a member of our #OneTenable team, you will work alongside passionate professionals and have access to the resources necessary to make a meaningful impact. Together, we achieve exceptional results!Important Note: Applicants must be authorized to work in the U.S. without sponsorship. We do not provide visa sponsorship at the time of hire or during employment, including but not limited to F1-OPT, F1-CPT, H-1B, TN, J-1, etc.Your Role:Tenable is looking for a Senior Software Engineer to enhance our VM Platform team. Your work will be pivotal in our Tenable One architecture, where you will manage vast amounts of asset data, process it to determine the “state of the world” for our clients, and ensure seamless integration with downstream search and reporting tools.We are tackling complex Big Data challenges, building and maintaining high-throughput, event-driven pipelines responsible for processing asset and vulnerability history. You will design systems that handle enormous scale, ensuring the accuracy and real-time availability of vulnerability data.To qualify for this position, you must meet one of the following criteria:Hybrid: Ability to commute to our Columbia, MD/Northern VA office.Hybrid: Ability to commute to our Boston, MA office.Remote: Currently reside in the San Francisco Bay Area, CA.Your Opportunity:Help shape the Future of Exposure Management: Contribute to the backend development of Tenable’s flagship Exposure Management (EM) platform, influencing the future of our EM offerings.

Join Continue as a passionate and quick-learning Software Engineer, where your contributions will be crucial in enhancing our open-source product. You'll begin by addressing and exploring user challenges on platforms like GitHub and Discord. In this position, you'll have the opportunity to design, develop, and sustain our open-source IDE extensions, creating a product that is cherished by many, including yourself.

Role overview Crusoe seeks a Sourcing Manager to join the team in San Francisco, CA. This position shapes procurement strategies and supports improvements across supply chain operations. The Sourcing Manager plays a key role in selecting suppliers, managing negotiations, and ensuring that sourcing practices reflect Crusoe’s sustainability commitments. What you will do Find and engage suppliers who meet established quality and sustainability criteria Negotiate contracts to secure favorable terms and competitive pricing Refine sourcing processes to improve operational efficiency and reduce costs Align all procurement activities with the company’s sustainability objectives

Company OverviewEcho Neurotechnologies is a pioneering startup in the Brain-Computer Interface (BCI) sector, committed to pushing the boundaries of innovation through sophisticated hardware engineering and artificial intelligence solutions. Our core mission is to provide groundbreaking technologies that empower individuals with disabilities, enhancing their autonomy and overall quality of life.Team CultureBecome part of a small, passionate team of skilled professionals dedicated to making a difference. In our early-stage environment, you will have the chance to influence significant decisions that will have a lasting impact. We prioritize continuous learning and development, encouraging cross-functional collaboration where your input is crucial to our collective success.Job ResponsibilitiesForge and nurture supplier partnerships for Echo throughout the product lifecycle, from initial design and development to commercial production.Work closely with R&D engineers, cross-functional teams, and suppliers during new product development to create essential medical devices, components, and materials based on the demands of our products and organization.Utilize processes to streamline New Product Development (NPD) initiatives encompassing quality assurance, cost management, delivery timelines, and risk mitigation with suppliers.Perform Make vs Buy analysis, supplier selection, develop sourcing strategies, negotiate contracts (including NDA, Development, and Supply), manage purchase orders, and maintain supplier relationships to ensure reliable supply and competitiveness.Oversee project management for sourcing deliverables, liaising with project managers, communicating with cross-functional groups and suppliers to monitor performance and address risks.Lead workshops with internal partners and suppliers to leverage DFx strategies and tools (such as manufacturability and supply chain considerations) alongside component plans to enhance part quality and reliability.Identify, reduce, and mitigate risks, improving timelines and fostering enduring partnerships crucial to overcoming business and technical challenges.Monitor supplied component quality, supply risks, material costs, and response/lead times for new products.Collaborate with suppliers to design launch plans, ensuring that materials, labor, and capacity are ready to meet demand.

About HandshakeHandshake serves as the premier career network tailored for the AI economy, connecting 20 million knowledge workers with 1,600 educational institutions and 1 million employers, including all Fortune 50 companies. Trusted by every leading AI lab, Handshake facilitates career exploration, recruitment, and skill enhancement, ranging from freelance AI projects to internships and full-time positions. Our extraordinary growth trajectory has seen us triple our Annual Recurring Revenue by 2025.Why join Handshake now:Play a pivotal role in shaping the future of careers within the AI economy, creating visible and tangible impact for your community.Collaborate directly with renowned AI labs, Fortune 500 partners, and leading educational institutions.Join a diverse team featuring expertise from Scale AI, Meta, xAI, Notion, Coinbase, and Palantir.Contribute to building a rapidly growing enterprise with significant revenue potential.The RoleAs the Strategic Projects Lead, you will oversee extensive coding data initiatives spanning weeks to months for elite AI and platform teams. Your role involves coordinating with hundreds to thousands of skilled Software Engineering Fellows, designing and managing technical evaluation and annotation processes, while ensuring high standards for delivery, profitability, quality, and client relationships.You will be responsible for crafting and validating coding assessments, establishing rubric-driven code review systems, measuring quality metrics, and swiftly adapting workflows to accommodate changing demands. This position serves as a bridge between machine learning, product development, engineering, and operations, requiring hands-on coding experience, proficiency with metrics, and a strong commitment to data integrity. Key responsibilities include:Managing multi-million dollar ARR-equivalent program scopes and delivery metrics.Overseeing the complete lifecycle of coding data programs: from scope definition to assessment design, fellow selection, annotation, quality assurance, and client feedback.Designing and administering technical evaluations (take-home assignments, unit-test driven tasks, live coding) to enhance the Software Engineering Talent Bench.Creating rubrics and audit processes to ensure that code annotations and model labels meet production quality standards.Developing scripts and infrastructure using Python, TypeScript, and SQL to automate quality assurance, analytics, and reporting.

Join Check in Revolutionizing PayrollAt Check, we simplify the process of paying people. Our mission extends beyond just our business; we partner with our clients to transform payroll services together. As the pioneers of embedded payroll solutions, we are reshaping how payment systems function, enabling payroll businesses to flourish and succeed. Discover our journey | Listen in.Check is more than just API infrastructure; we are a platform for entrepreneurship and growth in the payroll sector.About Our TeamPayroll systems need transformation. If you're passionate about solving complex challenges, join our team at Check! Here, your creative problem-solving, critical thinking, and determination will drive meaningful change across the businesses we support. We view challenges not as obstacles but as avenues for collaboration and innovation, leveraging the unique strengths of each team member.We welcome you to take the initiative and redefine the payroll landscape. Together, we can simplify the convoluted, make impactful changes, and foster a brighter future for businesses of all sizes.Role OverviewCheck is seeking a Strategic Initiatives Lead who thrives on addressing our most critical and ambiguous challenges, transforming them into sustainable solutions.This role requires a keen ability to swiftly identify core issues, distilling complexity into actionable insights. We seek an individual who embraces creativity in problem-solving, leveraging an array of strategies including product modifications, engineering improvements, operational methodologies, AI-driven workflows, and innovative process designs.You will collaborate closely with our COO and engage across various departments to tackle challenges that do not align neatly with any one function. Your work will range from planning and forecasting within our operational teams to reimagining intricate workflows through an AI-centric perspective. Many of these challenges will have a technical component—requiring data analysis, the use of AI tools, and a solid understanding of the underlying data architecture.Our team's challenges are not accompanied by playbooks; they are real-world issues with significant implications, and your ingenuity will be crucial. This is a leadership position, but it is inherently hands-on, allowing you to manage projects from conception to execution: strategy, tactics, and outcomes—all under your purview.

Crusoe Technologies seeks a Senior Manager of Sourcing based in San Francisco, CA. This position leads sourcing initiatives and helps define procurement strategies for the company. Key responsibilities Design and execute sourcing strategies that balance cost savings with quality improvements Build and maintain strong relationships with suppliers to align with business objectives Work closely with teams throughout the organization to improve procurement processes Guide sourcing and procurement efforts to support company growth Role focus This role centers on driving effective sourcing practices and collaborating across departments to enhance procurement outcomes. Leadership in this position directly influences Crusoe Technologies' ability to meet its operational and strategic goals.

Kraken is looking for a Product Manager for Growth Initiatives to help expand its cryptocurrency exchange platform in the United States. This role centers on broadening product offerings and boosting user engagement. Key responsibilities Collaborate with teams throughout Kraken to develop and launch new products Analyze market trends and user behavior to guide product direction Design and implement strategies to increase the user base and drive product adoption Ensure growth efforts support Kraken’s mission of making cryptocurrency accessible to more people Location This position is based in the United States.