Software Engineer, Merchant Tooling

Join Voyager Technologies, a pioneering company in defense, national security, and space technology, dedicated to delivering innovative and mission-critical solutions. We confront complex challenges to foster human progress, strengthen national security, and safeguard essential assets, striving to achieve technological and operational excellence from the ground to the stars.Be a Part of Shaping Tomorrow: Join Voyager TechnologiesThe future is crafted by those who dare to innovate. At Voyager Technologies, we are creating solutions that protect lives, push boundaries, and prepare for the next era. We seek individuals who are driven to solve problems, innovate, and lead. Our roles require courage and commitment.As part of our team, you will play a vital role in establishing the foundation of humanity's future. Experience a culture where innovation flourishes, curiosity is appreciated, and tangible impact is made. We are a community of doers, thinkers, and creators, united by a shared mission and a pragmatic approach.If you want to apply your skills in a high-stakes environment where the mission transcends individual contributions, forge the future with Voyager.

Join our dynamic team as a Junior Full-Stack Software Engineer Intern, where you'll play a crucial role in supporting a wide range of development projects. This internship offers an invaluable opportunity to grow your skills and gain hands-on experience in the tech industry.In this position, you will:Develop and maintain high-quality code with over 80% coverage, ensuring thorough documentation.Design and enhance components in our component library for improved functionality.Make proactive recommendations, prototype new features, and provide constructive feedback.Collaborate closely with the QA engineering team to ensure product quality.Communicate effectively with fellow engineers, product managers, clients, and partners.

Join Whatnot as a Software Engineer specializing in AI Development Tools, where you will be part of a dynamic team dedicated to building innovative solutions that enhance the user experience. You will play a crucial role in designing, developing, and implementing cutting-edge AI tools that streamline processes and improve productivity. If you are passionate about artificial intelligence and eager to make an impact, we want to hear from you!

Join Whatnot as a Software Engineer specializing in AI Development Tools. In this dynamic role, you will contribute to the design and implementation of cutting-edge AI tools that enhance user experience and streamline workflows. Collaborate with a talented team of engineers and data scientists to push the boundaries of technology and deliver innovative solutions.

About PureAt Pure, we're revolutionizing the world of rare coin and precious metal trading. Our vision is to provide collectors and investors with a financial framework that reflects the standards of contemporary markets. We are pioneering a cutting-edge order book marketplace designed to enhance transparency, efficiency, and trust within an industry still relying on outdated systems.Launched in 2023, Pure has swiftly become a leading marketplace for tangible assets, processing over $45 million in transactions each month. Our mission is to modernize this time-honored industry by merging the dependability of traditional trading frameworks with the innovations of modern technology.Your Role:Take ownership of critical features and subsystems from inception to deployment. You will make essential technical decisions, prioritize tasks, and deliver high-quality results swiftly.Design, develop, and optimize our marketplace backend, including order matching and order-book logic, with a focus on concurrency, correctness, and speed. Ensure robust transaction flows, payments, and data integrity.Enhance our frontend/UI/UX using TypeScript and Next.js: transform designer UX flows into high-quality components while optimizing performance through strategies like server-side rendering and code splitting.Engage deeply with PostgreSQL: focus on data modeling, query optimization, indexing, and schema design to ensure sustained performance as data volume and load increase.Develop and refine internal tools (“Nimbus”) that support accounting, logistics, operational dashboards, fraud detection, and monitoring.Lead small teams or mentor fellow developers: providing code reviews, unblocking teammates, and establishing best practices.Drive improvements in processes, technical architecture, testing strategies, and observability while being hands-on during incidents or urgent issues.Who You Are:Possess 3+ years of full stack engineering experience (or equivalent), particularly in dynamic startup environments.Demonstrate leadership capabilities by owning features/systems, guiding teammates, and making decisive choices.Be hands-on: you write and deploy code, prototype, troubleshoot, and consider architecture and scalability.Bring strong front-end experience with TypeScript and Next.js, coupled with a keen eye for UX/UI performance.

The Trade Desk is looking for a Senior Full Stack Software Engineer to join the Omnichannel division. This position centers on designing and building software that enhances user experiences across a range of platforms. Projects involve both web applications and integrated advertising technology. Key responsibilities Collaborate with engineering, product, and design teams to deliver applications for the omnichannel platform Develop and maintain software that integrates with The Trade Desk’s advertising technology stack Work on both front-end and back-end systems to support seamless user interactions Locations This role is open in Bellevue, Boston, Boulder, Chicago, Denver, Irvine, Los Angeles, New York, San Francisco, San Jose, Seattle, and Ventura.

At StubHub, we are dedicated to transforming the live event experience on a global scale. From the moment a fan seeks a ticket to when they enter the venue, we strive to provide exceptional service. Our platform is a trusted space for sellers, whether they are fans selling a single ticket or promoters of large-scale tours, ensuring convenience and safety for millions of users worldwide.We are on a journey to reconstruct the global marketplace for live experiences, integrating AI into our processes for discovery, personalization, pricing, and conversion. We seek a proactive and product-oriented Software Engineer II who is eager to take ownership across the entire technology stack and make a significant impact on the experiences of millions of fans.This role is not confined to just front-end or back-end tasks; it is for engineers who seek to wield influence. Candidates should be adept at navigating between UI, APIs, services, experimentation frameworks, and data-driven iterations to deliver meaningful product enhancements rapidly.Location: Hybrid (3 days in office/2 days remote) – New York, NY or Century City, CAAbout the Team:The Consumer Experience team manages the most vital aspects of StubHub, including:Event discovery and searchPersonalization and recommendationsMerchandising and pricing surfacesConversion and checkout flowsWeb and mobile user experienceWe foster a dynamic environment where talent thrives, encouraging engineers to influence product direction, conduct experiments, and drive business metrics. Our rapid deployment cycles, comprehensive measurement, and agile iteration are central to our approach.Your Responsibilities:Design and develop high-scale consumer features used by millions.Take ownership of projects from initial concept to deployment.Collaborate across front-end and back-end systems to achieve complete solutions.Implement A/B testing and iterate based on actual user data.Incorporate AI-powered features into user-facing product workflows.Engage closely with product, design, and data teams to drive results.

K2 Space Corporation is at the forefront of satellite technology, developing the largest and most powerful satellites ever launched. With significant backing of $450M from prominent investors such as Altimeter Capital, Redpoint Ventures, T. Rowe Price, Lightspeed Venture Partners, and Alpine Space Ventures, along with an additional $500M in contracts from commercial and U.S. government clients, we are mass-producing unparalleled satellite platforms for missions ranging from Low Earth Orbit (LEO) to deep space.The advent of heavy-lift launch vehicles is transitioning the aerospace industry into an era of mass abundance. We believe this evolution necessitates a new category of spacecraft, engineered to withstand extreme radiation and to maximize the capabilities of today’s and tomorrow’s powerful rockets. K2 satellites offer extraordinary capabilities at constellation scale across multiple orbits.With multiple launches scheduled through 2026 and 2027, we are dedicated to advancing humanity's exploration of the solar system and progressing towards becoming a Kardashev Type II (K2) civilization. If you are an enthusiastic individual who excels in a fast-paced environment and is eager to contribute to the success of an innovative Series C space startup, we invite you to apply.

Job Title: Senior Full-Stack Software EngineerLocation: Los Angeles; Open to RemoteReporting to: President; Co-FounderAbout 8Fleet:8Fleet is an innovative and rapidly expanding technology and logistics startup based in Los Angeles, focused on developing the operational infrastructure for both non-autonomous and future autonomous rideshare fleets. As we continue to grow, we’re eager to find passionate professionals who want to play a pivotal role in our success. You will have the opportunity to engage in various aspects of our operations as we expand throughout Los Angeles and beyond!About the Role:We are on the lookout for a skilled and adaptable Senior Full-Stack Software Engineer to take ownership of significant features across our comprehensive technology stack, ranging from databases and core APIs to the client-side user experience. This position is ideal for an engineer who excels in a dynamic environment, adept at translating ambiguous requirements into robust, high-quality, and scalable solutions, while also mentoring peers in best practices.What You'll Do:Application Development & OwnershipDesign, develop, and deploy new features and services across the full stack—including our fleet management dashboards, internal operations tools, and core logistics APIs.Own the complete lifecycle of features, from technical design and planning through implementation, testing, and production deployment.Write clean, maintainable, and thoroughly tested code in both frontend and backend environments, with a strong focus on performance and security.Collaborate closely with Product Managers and Designers to convert business requirements and mockups into seamless, high-performance user interfaces.Architecture & ScalabilityLead technical design discussions and play a key role in shaping the architecture of new systems, with a focus on scalability to accommodate 8Fleet’s increasing user base and vehicle count.Identify and resolve performance bottlenecks across the application stack, prioritizing database query optimization and API latency reduction.Implement robust monitoring, logging, and alerting mechanisms for production systems to ensure high availability and reliability.Promote and enforce engineering best practices, including continuous integration/continuous deployment (CI/CD).

Observable Space is at the forefront of space exploration, offering essential tools and technologies for organizations operating in the cosmos. By merging the expertise of PlaneWave Instruments, a leader in advanced telescope design, and OurSky, founded by a former SpaceX VP of software engineering, we are pioneering real-time space observation capabilities with our unique line of vertically integrated hardware and software products. Our offerings cater to a diverse range of sectors, including commercial, scientific, educational, governmental, and astronomy enthusiasts.Backed by prestigious investors such as Upfront Ventures, Oceans Ventures, Venrex, Marlinspike Partners, and Embedded Ventures, we are committed to innovation and excellence in the space industry.We are in search of a talented Full Stack Software Engineer to join our dynamic engineering team. This position will require extensive work with our backend microservices, JavaScript front ends, and C++ edge processing applications. The ideal candidate will bring a robust software engineering background, with particular expertise in distributed systems, relational database design, reactive frontend programming, and a strong design sensibility. This role will report directly to the Manager of Platform Engineering.

Genies is at the forefront of AI avatar technology, revolutionizing the way we interact with digital identities. Our proprietary Avatar Framework empowers developers to create lifelike AI personas that engage and resonate with users across diverse applications, including gaming, entertainment, and enterprise solutions. With significant backing of $200M from renowned investors like Silver Lake, BOND, and Bob Iger, we are determined to become the visual and interactive layer of the LLM-powered internet.As a Lead Full Stack Engineer, you will play a pivotal role in shaping the technical vision and execution of our avatar-driven products. You will lead a talented engineering team while also being hands-on in development, ensuring best practices and scalable solutions across our technology stack.Your Responsibilities:Provide technical leadership by defining the architectural framework for our full-stack systems.Mentor and develop your engineering team, guiding them through code reviews and fostering an environment of continuous learning.Engage in hands-on coding, focusing on delivering maintainable and high-performance features using modern technologies such as React, Next.js, Node, and Go.Collaborate effectively with cross-functional teams including product managers and designers to align on project goals and deliver user-centric solutions.

Role Overview Freeform Future Corp is hiring a Full Stack Software Engineer for its Los Angeles office. This on-site position focuses on building and maintaining enterprise applications that support key business functions. What You Will Do Design, develop, and maintain scalable software solutions for enterprise use. Collaborate with colleagues from different teams to deliver features and resolve issues. Work across both front-end and back-end stacks to ensure software meets user needs and supports efficient operations. What We Look For Experience working with both front-end and back-end technologies. Ability to contribute to all phases of the software development lifecycle. Strong communication skills and a collaborative approach to problem-solving. This role is based in Los Angeles, CA and requires on-site presence.

Join Our Team at Ad Hoc LabsAt Ad Hoc Labs, we are the proud creators of Burner, a leading independent app that has transformed the way millions manage their privacy and communications. Our mission is to develop top-tier software solutions that empower users while fostering a work environment that we are deeply proud of. Burner has maintained its position as a pioneer in virtual phone number applications for over five years, attracting millions of customers and receiving accolades from prestigious publications such as TIME and The New York Times.About the PositionWe are actively seeking a Full Stack Engineer with a strong emphasis on frontend development to become an integral part of our team. In this strategic role, you will spearhead the enhancement of our Burner Web App, our internal Admin Portal, and various web initiatives. You will play a dual role as both a hands-on contributor and a mentor, providing technical guidance to fellow engineers while driving forward impactful projects in an individual contributor capacity.

At Pirros, we are pioneering a transformative approach to how Architecture and Engineering firms oversee their design details. Our innovative software empowers professionals in the AECO (Architecture, Engineering, Construction, and Operations) sectors to optimize their detail management processes, significantly minimizing errors and accelerating project timelines. We are on a mission to establish the definitive system of record for detail management within a $12 trillion industry that has long been overlooked by technological advancements!About UsSupported by prestigious investors and angel backers, including Y Combinator, Funders Club, PlanGrid, and Elephant.Currently profitable with an annual revenue run rate of approximately $6 million, experiencing growth of over 10% month-over-month.Successfully secured our Series A funding round of around $17 million in 2025.We offer a competitive compensation package that includes salary, stock options, unlimited paid time off, and comprehensive health benefits.Our co-founders bring substantial experience from the structural engineering field.We currently serve over 350 firms, growing at a rate of 10% month-over-month, with a net revenue retention of 120%. Our clientele includes leading AEC design firms across the nation.Join our culture of high trust and autonomy, working alongside seasoned builders and operators.Make a tangible impact! We are addressing real challenges faced by those who design the world around us while crafting the future software stack for architects and engineers.About the RoleWe are searching for a Full Stack Member Technical Staff to join our team, aiding in the design and development of the essential applications that drive Pirros forward. This highly interactive position is tailored for engineers eager to tackle real-world problems, move swiftly, and take ownership of significant systems from start to finish. We value individuals who can think critically, execute efficiently, and are committed to creating high-quality software.This role is perfect for engineers who thrive in a startup atmosphere where expectations are high, ownership is genuine, and the impact is immediate.Your ResponsibilitiesDesign, develop, and sustain full-stack web applications that our customers rely on daily, translating requirements into efficient and scalable solutions.Take complete ownership of features from technical design through to production deployment.Produce high-quality, maintainable, and well-tested code.Enhance performance, reliability, and usability across the entire stack.Contribute to architectural decisions and help define our technical trajectory.Resolve complex issues in a timely manner.

About Quartech Quartech Systems Ltd. is a premier IT solutions and consulting firm based in Canada, dedicated to serving public-sector clients across Canada and the United States. With a remarkable track record spanning over 35 years in the IT industry, we specialize in delivering tailored technology solutions, designing and developing software, integrating systems, and providing comprehensive cloud solutions, particularly utilizing the Microsoft Dynamics 365 platform. At Quartech, we embrace Agile methodologies and DevOps practices, ensuring we remain at the cutting edge of industry developments by leveraging innovative technologies such as AI, automation, digital trust, and a diverse array of digital and mobile applications. Our commitment to growth is evident as we continue to expand significantly year after year, fostering highly collaborative teams that undertake varied projects across multiple sectors. Joining Quartech means engaging in meaningful work that positively impacts communities while receiving robust support for your professional growth. The Role In this vibrant, fast-paced, and collaborative environment, our Full-Stack Developers are responsible for designing, coding, and testing customized IT solutions utilizing the latest technologies, software delivery tools, frameworks, and deployment methodologies. As a consultant representing Quartech, you will collaborate with cross-functional teams on a variety of projects.

Riot Games is looking for a Manager, Software Engineering to guide the Tools & Frameworks team within the Developer Connections group. This team creates internal tools and frameworks that help other development teams work more efficiently. What you will do Lead and support engineers building developer productivity tools and frameworks Foster collaboration and encourage sharing of knowledge across the team Promote creative problem-solving and drive technical innovation Oversee engineering projects from initial planning through to delivery Locations Los Angeles, USA Mercer Island, USA Redwood City, USA

About Tech Holding Tech Holding is a consulting firm based in Los Angeles, California. The team brings together experience from startups and Fortune 50 companies, focusing on delivering reliable results and practical solutions. The company values deep industry knowledge, integrity, transparency, and follow-through in every client engagement. Contract Role Overview Tech Holding is hiring a Lead Full-Stack Engineer (Contract) to work with a key client. This role centers on end-to-end feature delivery across the stack, including React front-end architecture, Node.js services, and database design. The position requires hands-on technical leadership and the ability to make architectural choices that shape the platform’s future. Collaboration with client stakeholders and internal product and engineering teams is essential. The work environment is product-driven and values both technical execution and engineering quality. Main Responsibilities Own feature delivery across the full stack: React, Node.js, and database layers. Guide architectural decisions, such as API design, data modeling, service boundaries, and caching approaches. Set and maintain high standards for code quality through reviews, tooling, and best practices. Profile and troubleshoot performance issues throughout the stack, from frontend to backend. Design and maintain scalable search infrastructure, with a focus on Algolia. Mentor mid-level engineers while contributing directly to the codebase.

At Riot Games, our engineers possess not only deep expertise in their specific technical fields, but they also appreciate the chance to explore a wide array of broader domains. As a Staff Software Engineer in Tools, you will spearhead vital technical projects and exemplify outstanding engineering practices to your fellow engineers. We utilize both cutting-edge and established technologies to craft innovative solutions that tackle high-volume challenges while delivering exceptional value to our players. In this role as a Staff Software Engineer, Tools on a groundbreaking R&D product, you will design and develop the core components of the tools ecosystem for one of Riot's most thrilling upcoming titles. Collaborating closely with designers, artists, producers, and fellow engineers, you will gather requirements and establish a long-term vision for the developer tooling. Your responsibilities will include hands-on involvement in conceptualizing, planning, implementing, and maintaining the tools that enhance content creation workflows and boost developer efficiency. You will engage with state-of-the-art technology and seek innovative solutions that will surprise and delight our players as we bring this new game to life. You will report directly to the Director of Software Engineering within the team.

Embrace the Future of E-Commerce with Whatnot!Whatnot stands as the premier live shopping platform across North America and Europe, allowing users to buy, sell, and discover beloved items. We’re transforming the e-commerce landscape by integrating community, shopping, and entertainment into a personalized experience. Operating as a remote co-located team, we thrive on innovation while staying true to our core values. With our presence extending across the US, UK, Germany, Ireland, and Poland, we are collectively crafting the future of online marketplaces.From fashion, beauty, and electronics to unique collectibles like trading cards, comic books, and even live plants, our live auctions cater to diverse interests.As one of the fastest growing marketplaces, we are in search of bold, innovative problem solvers across various functional domains. Stay updated with the latest from Whatnot on our news and engineering blogs as we empower individuals to transform their passions into thriving businesses and foster community through commerce. Position OverviewThe Inventory team is dedicated to assisting sellers in efficiently managing their merchandise on Whatnot, ensuring accurate representation to reach a wider audience. Our aim is to streamline this process, allowing sellers to focus on what they excel at: engaging with their community and selling. The Merchant Tooling subteam specifically caters to the needs of our largest and most complex sellers. Whatnot is committed to supporting sellers as they evolve their businesses with us, building systems that facilitate both external and internal tooling for scalable needs, including integrations with other e-commerce platforms, WMS, ERPs, and accounting software.As a member of the Merchant Tooling team, you will be responsible for designing and constructing large-scale, highly reliable systems tailored to support our most intricate customers. Your primary focus will include:Implementing seamless, bi-directional data synchronization across marketplace, e-commerce, ERP, and other enterprise systems, ensuring accuracy, consistency, and low-latency data flow.Collaborating closely with cross-functional teams—including Product, Inventory, Operations, and external partners—to comprehend business needs and translate them into effective technical solutions.