Backend Software Engineer

About Our TeamAt OpenAI, we are committed to ensuring that Artificial General Intelligence (AGI) benefits all of humanity. Our B2B applications team plays a crucial role in this mission, as we empower businesses, enterprises, and governments to revolutionize their operations, ultimately driving economic growth and enhancing human potential.We design, develop, and manage innovative products that bridge our groundbreaking research with real-world applications. Our infrastructure powers the OpenAI API and various enterprise solutions, enhancing productivity and efficiency for users globally. Our multidisciplinary teams collaborate in product engineering, backend infrastructure, and safety, ensuring OpenAI’s technology is delivered with utmost reliability, security, and an exceptional user experience.Your RoleWe are seeking talented backend engineers to architect and scale the systems that underpin our developer and enterprise applications. In this role, you will be responsible for building and maintaining the services and infrastructure that drive OpenAI's applications, which include large-scale distributed systems, databases, APIs, and data pipelines. You will work closely with product, research, and infrastructure teams to integrate new AI capabilities into production while ensuring performance, safety, and compliance on a global scale.Key Responsibilities:Lead the complete development lifecycle for new platform features and integrations with external systems.Collaborate with product managers, designers, and external stakeholders to identify challenges and implement innovative solutions.Partner with the research team to enhance the next generation of AI models.Your Background:5+ years of professional software engineering experience in roles at technology or product-focused companies.Experience as a founder or an early engineer in a startup environment is highly desirable.Proficient in one or more backend programming languages (e.g., Python, Go, Rust, TypeScript) and have a solid understanding of distributed systems.Passionate about building infrastructure that can handle billions of requests and manage vast datasets.Demonstrate a strong commitment to reliability, safety, and performance in production systems.An interest in AI/ML technologies is a plus, though direct experience is not mandatory.

About Our TeamAt OpenAI, we are driven by a profound mission: to ensure that Artificial General Intelligence (AGI) is beneficial to all of humanity. Our commitment to this mission extends to the B2B sector, where we aim to empower businesses, enterprises, and governments to transform their operations, fostering economic growth and enhancing human potential.We develop and manage innovative products that bridge our groundbreaking research with millions of companies and developers globally. Our technology powers the OpenAI API and various enterprise solutions, enabling users worldwide to enhance their productivity and efficiency. Our diverse teams, specializing in product engineering, backend infrastructure, and safety, collaborate to deliver OpenAI's technology with utmost reliability, security, and an exceptional user experience.About the RoleWe are seeking talented Frontend Engineers to design and implement user interfaces that make advanced AI intuitive and accessible. In this role, you will collaborate closely with design, product management, and research teams to create responsive, high-performance, and secure web applications that bring OpenAI’s models and enterprise products to life.This position is based in either San Francisco, CA, or New York City, NY. We operate on a hybrid work model, requiring 3 days in the office each week, and we offer relocation assistance to new hires.Your ResponsibilitiesDevelop and maintain scalable web applications utilizing modern JavaScript/TypeScript, React, and accompanying technologies.Create reusable UI components and front-end frameworks to expedite product development.Enhance client performance while ensuring cross-browser and device accessibility.Collaborate with designers to craft user-friendly and visually appealing interfaces.Participate actively in end-to-end product planning and strategic decision-making.You Will Excel in This Role If You:Possess 5+ years of professional experience (excluding internships) in building production-grade web applications.Are proficient in TypeScript/JavaScript, React, and contemporary web development tools.Demonstrate a strong commitment to design fidelity, performance, and accessibility standards.Enjoy rapid iteration to deliver polished, user-centric features.Previous experience as a founder or early engineer at a startup is a plus.

About Our TeamAt OpenAI, we are committed to ensuring that Artificial General Intelligence (AGI) benefits everyone globally. Our mission can only be fulfilled if AGI translates into tangible advantages across diverse industries. Within our B2B Applications team, we strive to assist businesses, enterprises, and governments in redefining their operations to empower individuals and accelerate economic progress.We design and maintain products that leverage our pioneering research to serve millions of companies and developers worldwide. Our technology underpins the OpenAI API and enterprise solutions, enabling users to enhance their productivity and efficiency. Our collaborative teams encompass product engineering, backend infrastructure, and safety, all working in unison to ensure that OpenAI’s technology is delivered reliably, securely, and with an exceptional user experience.Role OverviewWe are seeking talented full stack engineers to architect and scale the systems powering our developer and enterprise products. In this position, you will explore the forefront of OpenAI’s latest technologies, facilitating interactions and automations that are not only functional but also engaging. We value proactive and product-oriented engineers who can maintain a holistic perspective while attending to the intricate details that create outstanding products.Key Responsibilities:Lead the complete development lifecycle for innovative enterprise products.Work collaboratively with product managers, designers, and external clients to identify challenges and devise effective solutions.Partner with the research team to enhance our next-generation models.Ideal Candidate Profile:5+ years of professional engineering experience in relevant roles at technology and product-focused organizations.Experience as a founder or early engineer at a startup, with a background in building products from the ground up is a bonus.Strong proficiency in TypeScript, React, and other web technologies.Proficient in one or more backend programming languages (e.g., Python, Go, Rust, TypeScript) and familiar with distributed systems concepts.Experience with relational databases such as PostgreSQL or MySQL.A strong commitment to reliability, safety, and performance in production environments.An interest in AI/ML, though direct experience is not mandatory.Proven ability to flourish in a fast-paced, evolving environment.

Join Front, the innovative customer operations platform designed to tackle B2B complexities, where we synchronize every team, tool, and customer interaction, empowering companies to scale while maintaining meaningful connections. Unlike others who manage simple exchanges, Front excels in orchestrating the intricate coordination and context of B2B relationships. Over 9,000 organizations, including industry leaders like Uber Freight, Navan, and Stripe, depend on Front to execute the operational dynamics essential for effective customer-facing functions.With strong backing from Sequoia Capital and Salesforce Ventures, Front has successfully raised $204 million from top-tier venture capitalists and influential investors, including executives from Atlassian, Okta, Qualtrics, Zoom, and PagerDuty. We are proud to have received numerous accolades as a Great Place to Work, including Built In's 100 Best Midsize Places to Work in SF 2025, Top Places to Work by USA Today 2025, Y Combinator's list of Top Companies in 2023, #4 on Fortune’s Best Workplaces in the Bay Area™, Inc. Magazine's 2022 Best Workplaces list, and Forbes Best Startup Employers 2022 List.We are seeking two talented backend Software Engineers to join our Deliverability team in San Francisco. This pivotal team manages the foundational systems that power Front, including the pipeline that connects our platform to the outside world. You will be responsible for processing tens of millions of events, ensuring the swift and reliable delivery of emails, SMS, and other messages to and from Front. You will take ownership of essential infrastructure that our customers rely on and assume a technical leadership role.

Role Overview Sigma Computing builds a high-performance platform focused on modern data architecture. The engineering team is growing, and the company is looking for experienced backend engineers who enjoy solving complex problems and building features that matter. The mission: make data accessible for every user. What You Will Do Address technical challenges that come with delivering interactive data exploration and analysis on top of data warehouses. Work with technologies such as Rust, Go, GraphQL, Node, and Kubernetes. Build backend distributed services, develop new algorithms, and create APIs to power cloud-based applications. Investigate, debug, and resolve product or system issues by identifying their underlying causes. Design and implement new software features to support a growing user base. Participate in design and code reviews with colleagues and stakeholders to uphold best practices across the technology stack. Location This position is based in San Francisco, CA.

Backend Software Engineer – AI Applications San Francisco Bay Area | Hybrid (3 days onsite, 2 remote)About TrueMeterAt TrueMeter, we are revolutionizing the way businesses manage their energy costs. The U.S. power grid was not designed for the AI era, and we are here to change that. With the rising demand for data centers and the lagging adoption of renewable energy, many businesses are facing increasing utility bills. Our solution? The AI Energy Agent—a system that simplifies and reduces energy costs by consolidating multiple utility bills into a single, affordable subscription. Since our MVP launch in May 2024, we have successfully onboarded millions in energy spending from notable brands. As a seed-stage startup backed by prominent Silicon Valley investors, we are poised for rapid growth.If you are passionate about developing AI-driven systems that can make a significant impact on the planet, we want to hear from you!The RoleWe are seeking a Backend Software Engineer (AI Applications) who thrives in fast-paced, early-stage environments. In this role, you will transform ideas and prototypes into functional systems in a matter of days.You will be responsible for creating the backend infrastructure that powers our AI Energy Agent, including LLM-driven systems that analyze, structure, and interpret energy data. This includes integrating with multiple utility APIs, managing data pipelines, and developing services that ensure our AI solutions are effective and reliable.You will collaborate closely with the co-founder/CTO and a talented team of engineers, designing scalable backend systems that can grow from 10 customers to 10,000, all while taking ownership of your work and delivering with pride.What You Will CreateAI-Driven Backends: Develop production systems that connect LLMs and coding agents to our data and product APIs.Service Architecture: Design and implement fast, secure microservices using Python (and optionally TypeScript).Data Integration: Build reliable connectors to energy company portals and public data sources.Infrastructure for Intelligence: Help architect the backend infrastructure that enables AI agents to read, reason, and act autonomously across our data stack.Performance & Scalability: Own systems that are designed to operate 24/7 with low latency and high reliability.

About Our TeamAt OpenAI, we are pioneers in the field of artificial intelligence, committed to driving innovation and shaping a future where AI benefits everyone. We seek passionate and visionary Research Engineers to become part of our Applied Voice Team. In this role, you'll engage in transformative research on speech models, translating these insights into real-world applications that can revolutionize industries, enhance human creativity, and tackle complex challenges.About the RoleAs a Research Engineer on OpenAI's Applied Voice Team, you will collaborate with some of the most talented professionals in AI. You will be responsible for designing and developing cutting-edge speech models, including speech-to-speech, transcription, and text-to-speech functionalities. Your work will help translate groundbreaking research into practical solutions for B2B applications, APIs, and ChatGPT AVM. If you are eager to make AI more accessible and impactful, this is your opportunity to leave a lasting legacy.Key Responsibilities:Innovate and Build: Conceptualize and create advanced machine learning models that address real-world challenges, transforming OpenAI's research into AI applications with significant impact.Collaborate with Experts: Partner with software engineers, product managers, and deployed engineers to understand intricate business challenges, respond to customer needs, and deliver AI-driven solutions. Join a vibrant team environment where creativity and ideas flourish.Optimize and Scale: Develop scalable data pipelines, enhance models for improved performance and accuracy, and ensure readiness for production. Contribute to high-tech projects that demand innovative methodologies.Learn and Lead: Stay at the forefront of developments in machine learning and AI by participating in code reviews, sharing insights, and exemplifying high-quality engineering practices.Make an Impact: Oversee and maintain deployed models to ensure they consistently provide value. Your contributions will significantly influence the role of AI in benefiting individuals, businesses, and society as a whole.Ideal Candidate Profile:Master's or PhD in Computer Science, Machine Learning, or a related discipline.A minimum of 2 years of professional experience in engineering roles within technology and product-focused organizations (internships excluded).

Join Air Apps as a Backend Software EngineerAt Air Apps, we’re passionate about innovation and speed. Founded by a family in 2018 in Lisbon, Portugal, we are on a mission to revolutionize how individuals and entrepreneurs manage their resources with our AI-powered Personal & Entrepreneurial Resource Planner (PRP). With over 100 million downloads globally, and offices in both Lisbon and San Francisco, we continue to grow as a self-funded company.As a Backend Software Engineer, you will play a crucial role in designing, developing, and maintaining the server-side components of our applications. Your collaboration with product managers and frontend developers will ensure our services are robust and scalable, ready to support our rapid growth.Join us in this exciting journey to redefine resource management and positively impact lives worldwide.

About FormalAt Formal, we empower organizations with cutting-edge data security solutions that enable teams to effectively manage and understand their data seamlessly.Our innovative approach involves developing a state-of-the-art protocol-aware reverse-proxy for datastores and APIs, allowing businesses to monitor their data in real-time. This capability ensures that sensitive information is handled according to the principle of least privilege, utilizing masking, filtering, and anonymization strategies.We proudly serve top-tier companies such as Ramp, Gusto, and Notion, helping them navigate challenges in data security, compliance, and infrastructure access.Backed by leading venture capital firms like Thrive Capital and Y Combinator, alongside angel investors from renowned tech companies such as Datadog, Clickhouse, Plaid, and Vanta, Formal is at the forefront of data security innovation.About the RoleWe are on a mission to assemble an exceptional engineering team and are seeking individuals eager to make a substantial impact on our product and company growth.The ideal candidate possesses a profound understanding of scalable backend systems, demonstrates a strong sense of ownership, and thrives on managing projects from their inception to full-scale production deployment.Our current technology stack includes Golang, Rust, Temporal, various datastore protocols (such as Postgres, S3, Kafka, MySQL, Snowflake, Redshift, SSH), and AWS.What You'll DoDesign and develop a robust data platform capable of processing substantial data volumes in real-time.Lead the development of new product features, overseeing everything from research and implementation to ongoing maintenance.Enhance the performance and reliability of both new and existing features.Spearhead initiatives that could significantly influence Formal's trajectory.Architect scalable services as the company grows and manages increasing traffic.What You NeedProven experience in software development, specifically in building data-intensive platforms.A strong appreciation for code simplicity and performance optimization.Expertise in Golang and familiarity with its ecosystem.Experience with data streaming frameworks such as Apache Kafka and Google Pub/Sub.

Company BackgroundAt Specter, we are pioneering a software-defined control plane that enhances the safety and visibility of physical assets for American businesses. Our innovative approach leverages a robust hardware-software ecosystem built on advanced multi-modal wireless mesh sensing technology, drastically reducing the costs and time associated with sensor deployment.Our platform is set to revolutionize the way companies perceive their physical environments, enabling real-time visibility and management of operations. With a passionate team hailing from prestigious organizations such as Anduril, Tesla, Uber, and the U.S. Special Forces, we are committed to leading the charge in the rapidly evolving realm of physical AI and robotics.Role + ResponsibilitiesWe are on the lookout for a Backend Software Engineer to join our engineering team. In this role, you will be instrumental in designing, deploying, and scaling distributed systems that power our mother node base stations and cloud services. Your contributions will ensure the reliability, scalability, and performance of Specter’s sensing and perception platform across both edge devices and cloud infrastructure.Key responsibilities include:Architecting and operating distributed, Linux-based systems across edge and cloud environments.Designing scalable pipelines for streaming, storing, and processing vast amounts of video and sensor data.Building containerized services (Docker/Kubernetes) for the deployment of perception and inference workloads at scale.Developing observability systems for monitoring, logging, and alerting across our fleet of edge nodes and cloud infrastructure.Optimizing queue-based video ingestion, transcoding, and upload pipelines for reliability in bandwidth-constrained environments.Implementing highly available infrastructure for real-time alerting, APIs, and customer-facing event systems.Collaborating cross-functionally with hardware, perception, and application teams to ensure infrastructure supports rapid iteration and scalability.

About AnonAnon is at the forefront of revolutionizing enterprise automation through our innovative platform designed to deploy authenticated AI agents for critical data workflows.We are addressing one of the most significant challenges in enterprise automation: unlocking and transforming data that is currently inaccessible due to authentication barriers. Our cutting-edge platform empowers AI agents to securely interface with web-based systems, extracting unstructured data and seamlessly delivering it via modern APIs.Since our inception in 2023, we have enabled industry leaders to convert weeks of manual processes into automated workflows that complete in mere minutes. Our efforts have garnered $14M in funding from renowned investors including Union Square Ventures, Forerunner Ventures, Okta Ventures, and Abstract Ventures.Our vision is clear: every business system should be fully accessible to AI agents. If you are passionate about constructing the infrastructure that will drive the next generation of AI applications, we invite you to join our dynamic team of 12 in San Francisco.www.anon.com/careers

Join Pinterest as a Senior Backend Software Engineer, where you'll be part of a dynamic team dedicated to building innovative solutions that enhance user experiences. We are looking for a passionate engineer with a strong background in backend development, who thrives in a fast-paced environment and is eager to tackle complex technical challenges.

About Ivo, Inc. Ivo, Inc. builds technology for the legal sector, focusing on tools that help legal professionals work more efficiently. Based in San Francisco, the team has launched several products in recent years, including: An AI-powered agent for MS Word that assists with document editing (2023) Agentic RAG using embeddings models (2023) LLM-based large-scale legal fact extraction (2024) A legal assistant for accurate search across large contract databases (2024) Advanced clustering for related legal documents (2025) Automated deviation analysis to surface hidden risks in contracts (2025) Tools for merging contracts and amendments into a single timeline, giving clients a clear view of their agreements (2025) Role Overview: Backend Software Engineer The Backend Software Engineer will help build and scale systems that address complex legal challenges. This role centers on creating reliable infrastructure and tools to process millions of contracts and support legal teams. What You Will Do Develop systems that process and analyze large volumes of contracts with high reliability Design and implement data pipelines to coordinate LLMs, extraction, and clustering algorithms Build precise search and retrieval systems for legal data Work closely with legal experts and product teams to adapt to new developments in LLMs Our Mission Legal teams in major organizations often face long hours and demanding workloads, especially in contract review. Until recently, technology provided little relief. With advances in LLMs, Ivo aims to restore balance by automating tedious legal tasks. Ivo’s AI-native platform is designed to reduce manual work for lawyers. The software is well-received by users and currently holds an 85% trial win rate, the highest in the market. The team continues to expand what the platform can do. Who We’re Looking For Engineers who enjoy coding, value collaboration, and want to solve challenging problems with creative solutions

About WorkWhileAt WorkWhile, we are dedicated to empowering hourly workers to achieve financial stability and improved quality of life. With over 80 million Americans engaged in hourly employment, many face unpredictable schedules, low wages, and scarce benefits, which can lead to economic hardship.Our innovative platform is transforming the landscape of frontline work by fostering a more adaptable and effective labor market. Leveraging advanced AI technology, WorkWhile enables businesses to swiftly connect with top-tier talent. Workers enjoy same-day pay, complimentary telehealth services, opportunities for skill advancement, and the flexibility to select shifts that align with their expertise and personal schedules.Our ambitious aim is to harmonize incentives and address inefficiencies in the labor market, challenging the $650 billion staffing and recruiting industry. Supported by Khosla Ventures and celebrated by the Inc. 5000 for remarkable growth, WorkWhile is at the forefront of redefining the future of work.

About the TeamOpenAI’s B2B Engineering team is committed to delivering our advanced technology to the world through our developer platform and enterprise products. We develop robust backend systems, APIs, and infrastructure that empower developers and organizations to leverage OpenAI's capabilities in production environments.Our expertise encompasses distributed systems, data infrastructure, platform services, and enterprise-grade features such as security, compliance, authentication, and reliability. We collaborate closely with product, research, design, infrastructure, and forward-deployed teams to transform pioneering AI functionalities into scalable and dependable products.About the RoleWe are seeking a Principal Software Engineer to architect and scale the systems that drive our developer and enterprise-facing products. You will take charge of the design for backend services and platform capabilities that safely and reliably integrate new AI functionalities into production at a global scale.This position covers a wide technical landscape, including distributed systems, APIs, databases, data pipelines, and secure enterprise infrastructure. You will play a pivotal role in shaping both the technical architecture and the product experience of our platform, maintaining high standards for performance, safety, reliability, and API design.ResponsibilitiesDesign, implement, and scale backend services, APIs, and infrastructure supporting OpenAI’s developer and enterprise products.Lead the architectural design of distributed systems, databases, and data pipelines that handle large-scale, high-reliability production workloads.Own key platform capabilities from initial technical strategy and design through implementation, launch, and ongoing operation.Carefully shape API design, treating interfaces as core product touchpoints while ensuring a top-notch developer experience.Create secure, reliable, and compliant systems that cater to both enterprise and developer needs.Work closely with product, research, design, infrastructure, and forward-deployed engineering teams to deploy new capabilities into production.Steer technical direction across complex challenges, making sound architectural trade-offs to balance speed, quality, and maintainability.Enhance engineering productivity by developing internal tools, platform abstractions, and systems that amplify efficiency across the organization.

About CondorAt Condor, we are transforming the financial infrastructure of clinical development. While substantial investments are made annually to discover and develop new therapies, the processes behind these advancements often remain outdated and disconnected. Our mission is to bridge this gap, creating a cohesive system that integrates clinical operations, vendor activities, and financial data into a real-time intelligence layer. This empowers R&D and finance teams with the insights they need to make informed decisions.Our AI-driven, pharma-native infrastructure is designed to scale industry standards that we have helped shape alongside major partners. We facilitate prediction, control, and execution in some of the most complex R&D environments globally.As we continue to gain the trust of enterprise teams, we are now focused on the critical task of scaling our operations in a high-stakes environment.Condor is a rapidly growing company, backed by leading institutional investors such as Felicis and 645 Ventures, collaborating with top 200 biopharma companies. This is a unique opportunity to contribute to the infrastructure that influences how new therapies reach patients.The RoleWe are seeking a Senior Backend and Data Platform Engineer to play a key role in developing the foundational data infrastructure for Condor’s financial intelligence platform. This position is pivotal in turning complex clinical and financial data into actionable intelligence that enterprise biopharma teams can rely on.In this role, you will be responsible for designing and managing the core data foundations that underpin Condor’s financial engine and AI capabilities. Your work will involve modeling intricate, high-stakes data, constructing reliable data pipelines and services, and ensuring that product features and intelligence workflows function with precision, consistency, and scalability. The systems you develop will directly support critical finance and operational applications.This hands-on, senior engineering position provides you with significant ownership. You will engage with backend services, data pipelines, and APIs, bringing features from concept to production. You will define necessary data schemas, transformations, and architectural patterns that become essential as our platform evolves. Although your primary focus will be on backend and data engineering, you will also be encouraged to work across the stack to ensure seamless integration of data and intelligence.

About UsAt Shepherd, we are revolutionizing the landscape of commercial Property & Casualty insurance, primarily aimed at high-hazard industries. As a technology-focused Managing General Underwriter (MGU), our mission is to streamline risk management for those who construct and operate within the physical realm, safeguarding innovations from inception through to construction and over the years of operation.We are developing an advanced commercial risk platform that harnesses underwriting expertise, data analytics, and automation to provide:Accelerated decision-makingEnhanced pricing accuracyImproved risk resultsWith Shepherd, safety, speed, and quality are no longer mutually exclusive; instead, they synergize to create better outcomes. Our goal extends beyond modernizing insurance products; we are crafting the risk infrastructure for the future of financial services, ensuring seamless collaboration among technology, underwriting, and partnerships to empower the world's critical industries.Our InvestorsShepherd has successfully secured over $20M in funding from prestigious investors, including:Spark CapitalCostanoa VenturesY CombinatorSusa VenturesIntact VenturesJoin Our TeamWe are searching for a passionate and skilled Software Engineer to join our dynamic team. If you are someone who embraces ownership, delivers results, and is committed to technical excellence and making a positive impact for our customers, we want to hear from you!

At Exa, we're revolutionizing the AI landscape by developing a cutting-edge search engine from the ground up. Our robust infrastructure is designed for large-scale web crawling, utilizing advanced embedding models for indexing, and super-efficient vector databases developed in Rust for rapid search capabilities. Our impressive $5 million H200 GPU cluster powers tens of thousands of machines, ensuring optimal performance for our innovative solutions.As a Backend Software Engineer, you will be an integral part of our dynamic team, contributing to the backend architecture and system enhancements. We value your unique skills and interests, allowing flexibility in project assignments that align with your expertise.

About UsAt Koah Labs, we are pioneering an advertising network tailored for the next generation of AI-driven products. Our objective is to empower publishers to optimize their revenue while enabling advertisers to connect with their ideal audience, all without sacrificing speed, user experience, or privacy.As a compact, tightly-knit team based in San Francisco, our members bring expertise from esteemed organizations such as X, Apple, and Meta, as well as from dynamic startups. With backing from top-tier investors, we are rapidly expanding and gaining significant traction on both the publisher and advertiser fronts.Joining Koah Labs means being part of a foundational phase: you will develop code that significantly impacts both the company and the innovative ecosystem we are crafting. We prioritize agility, foster a culture of high trust, and are deeply committed to our craft.Our Technology StackInfrastructure: Terraform, AWS, LGTM (Loki, Grafana, Tempo, Mimir), Tailscale, CloudflareData Management: PostgreSQL, ClickHouse, Redis, Kafka, PythonCore Application Development: Ruby on Rails, React, TypeScriptSDK Development: Flutter, React Native, Android, iOSKey ProjectsDevelop scalable data models that facilitate multiple impressions for ad requestsCreate abstractions that enable experimentation and deployment of new formats to track engagement events effectivelyImplement a low-latency frequency capping system to enhance the user experienceIdeal Candidates Will:Have a passion for debugging and optimizing performanceBe detail-oriented, crafting reliable abstractions for team membersEnjoy experimentation, measuring results, and establishing dependable systems