Software Engineer II - Fullstack / Product Engineering

Flex is hiring a Senior Fullstack Software Engineer to join the Risk Engineering team. This position can be based in New York, San Francisco, or remote within the U.S. Role overview This role centers on designing, building, and maintaining applications that support Flex’s risk management efforts. The Senior Fullstack Software Engineer will collaborate closely with teammates to deliver solutions that improve how risk is assessed and managed across the company. What you will do Develop and maintain both frontend and backend components for risk-related applications Work with team members to design features and solve technical challenges Contribute to projects from initial planning through deployment Requirements Experience in both frontend and backend software development Ability to drive projects through the full development lifecycle Interest in building solutions that support risk management

About ClarionAt Clarion, we are revolutionizing communication in healthcare through the power of AI.Currently, clinics are missing 30–40% of patient calls and their staff is burdened with administrative tasks. We envision a future where AI agents manage these workflows, including scheduling, billing, prescription refills, and follow-ups, allowing healthcare professionals to dedicate more time to patient care.We are developing the essential communication infrastructure that modern healthcare needs. Our AI agents do more than just answer calls—they manage workflows from start to finish, ensuring that every patient is heard. To date, we have successfully handled hundreds of thousands of patient interactions across virtual care companies, health systems, and a $5 billion health insurance provider.Founded by a physician trained at Stanford and Harvard, alongside a former Amazon Alexa engineer who led AI/ML teams at Salesforce, Clarion has raised $5.4 million from prominent investors including Accel, Y Combinator, and Sequoia. Our in-person team in New York is rapidly advancing to tackle one of the most pressing challenges in healthcare.

At CLEAR, we are pioneering the future of secure identity. Our mission is to enhance safety and convenience in both physical and digital experiences. With over 38 million members and a rapidly expanding network of partners worldwide, our secure identity platform is revolutionizing how individuals live, work, and travel. Whether at airports, stadiums, or in everyday situations, CLEAR is committed to providing seamless experiences for our members. As a recognized leader in digital and biometric identification, CLEAR is dedicated to minimizing friction during ID checks for our members. We are in search of a talented Senior Software Engineer to contribute to the development of next-generation products that extend beyond traditional ID solutions, empowering our members to harness the full potential of a connected digital identity. In this role, you will engage in the design, implementation, testing, and deployment of applications that enhance our platform, ensuring that member privacy and security remain paramount.

Join our dynamic team at counsel as a Senior Fullstack Software Engineer, where you will play a pivotal role in designing and developing cutting-edge applications. You will collaborate with cross-functional teams to build scalable and efficient software solutions. This is an opportunity to leverage your expertise in both front-end and back-end technologies to create impactful products.

At Plaid, we envision a future where financial interactions are seamless and transformative. Our commitment to this vision drives us to create innovative tools and experiences that empower thousands of developers in crafting their own financial products. As a pivotal player in the financial ecosystem, Plaid enables millions of users to achieve better financial health by connecting their financial accounts effortlessly to the applications they trust. We proudly partner with leading companies such as Venmo and SoFi, along with many Fortune 500 firms and major banks, to simplify financial connectivity. Our expansive network encompasses over 12,000 financial institutions across the US, Canada, the UK, and Europe. Founded in 2013 and headquartered in San Francisco, we also have vibrant offices in New York, Washington D.C., London, and Amsterdam.Plaid's mission is to democratize financial freedom for all by ensuring that money movement and access to financial data is both straightforward and secure. In the role of a Senior Fullstack Software Engineer, you will lead the design and development of systems that facilitate how millions connect with their finances.In this dynamic position, you will traverse the full technology stack, developing robust backend services and APIs while simultaneously crafting engaging, high-quality frontend experiences. This role is perfect for engineers who thrive in both backend problem-solving and frontend user interface design, eager to enhance their impact across the spectrum.You will be a key collaborator with product managers, designers, and fellow engineers to deliver products that are not only reliable and secure but also delightful for users. At Plaid, we empower our engineers to take ownership from the outset, contribute to architectural decisions, and witness their work reach millions of users.

Join Flex, a rapidly growing FinTech company headquartered in New York City, as we revolutionize the rent payment process. It's 2026, and we believe that paying rent should be affordable, flexible, and hassle-free. Our mission is to empower renters with the ability to pay their rent on a schedule that aligns with their financial needs. After establishing a strong foundation of investor support and a dedicated user base, we are seeking passionate individuals to join our team and help us drive our mission forward.As a Senior Fullstack Software Engineer, you will play a crucial role in propelling our company’s growth. Your expertise will be vital in developing and scaling our platform and application experiences, ultimately facilitating our ambitious goal of achieving 10x growth.

At StubHub, we are committed to revolutionizing the live event experience on a global scale. Whether it's a fan's first concert or their hundredth game, our goal is to provide an exceptional journey from ticket search to entry. This extends to our sellers as well; from individual fans to large promoters, we aim to make StubHub the premier platform for ticket transactions worldwide.We are in search of experienced Senior Software Engineers to create innovative technologies and intricate features that enhance how millions of users discover, engage with, and attend live events globally. As a Senior Software Engineer, you will play a key role in shaping our commercial and product strategies. Your focus will be balanced between understanding user needs and making astute commercial decisions. Our Senior Software Engineers are vital to our success, demonstrating initiative and enthusiasm in addressing challenges. At StubHub, we pride ourselves on being an exceptional and inclusive workplace. You will also act as a mentor and advocate for your team members, showcasing leadership qualities.Location: Hybrid (3 days in office/2 days remote) – Aliso Viejo, CA or New York, NY or Seattle, WAAbout the Team:The Supply team's mission is to streamline the experience for our large-ticket sellers by simplifying the onboarding and inventory management process throughout the entire event lifecycle. We empower sellers to minimize operational burdens and maximize revenue through intelligent automation and efficient workflows that operate at marketplace speed. Our infrastructure consists of enterprise-grade, high-throughput systems that support core seller operations and manage extensive, dynamic datasets. Our work encompasses multiple layers of the technology stack, from robust back-end services to high-performance, user-focused interfaces, ensuring that sellers have a reliable platform they can trust to manage their business.

About ClarionAt Clarion, we're transforming communication in healthcare through cutting-edge AI technology.Currently, clinics are missing 30–40% of patient calls, while their staff faces overwhelming administrative burdens. We envision a future where AI agents manage workflows like scheduling, billing, prescription refills, and follow-ups, allowing healthcare teams to prioritize patient care.We are developing the essential communication framework that modern healthcare demands. Our AI agents not only respond to calls—they complete entire workflows, ensuring that patients are always heard. To date, we've facilitated hundreds of thousands of patient interactions across various virtual care providers, healthcare systems, and a $5B health insurance company.Founded by a physician with training from Stanford and Harvard (part of the founding team at Two Chairs and Ophelia) and an ex-Amazon Alexa engineer who led AI/ML initiatives at Salesforce, we have secured $5.4M in funding from notable investors including Accel, Y Combinator, Sequoia (Scout), and prominent healthcare entrepreneurs. Our team operates in-person in New York, moving swiftly to tackle one of healthcare's most pressing challenges.Why This Role Is UniqueOwnership of high-impact projects: You'll be responsible for significant features and systems that are actively used in real healthcare settings.Early traction and strong signal: With numerous paying customers and increasing revenue, you'll have the opportunity to influence critical product decisions.Learn from industry leaders: Collaborate closely with founders and experienced engineers who work at the nexus of healthcare, AI, and real-time systems.Your ResponsibilitiesDevelop and maintain full-stack features that drive AI-enhanced healthcare communication.Integrate with EHRs, legacy healthcare systems, and real-time voice infrastructure.Work collaboratively with product, design, and senior engineers to turn customer feedback into deliverable software.Enhance reliability, performance, and scalability across active systems.Engage in technical discussions, code reviews, and contribute to the evolution of engineering best practices.Technical Challenges Awaiting YouAI-driven workflows: Support and expand LLM-based systems utilized in real-time healthcare interactions.Real-time systems: Contribute to low-latency services that provide seamless healthcare experiences.

About GreenboardAt Greenboard, we are pioneering the future of financial compliance. Our unified, AI-driven compliance operating system serves registered investment advisors (RIAs), fintechs, private funds, hedge funds, and beyond, replacing the disjointed array of legacy tools and automating processes beyond previous capabilities. By centralizing data and streamlining workflows, Greenboard empowers firms to mitigate regulatory risks, simplify their technology infrastructure, modernize compliance operations, and achieve cost savings.Our founding team consists of engineers who have successfully scaled products at industry giants such as Amazon and Google, as well as at several unicorn startups. Supported by esteemed investors including Y Combinator, General Catalyst, and Base10, we have raised over $20 million to date. Renowned financial institutions already trust Greenboard, and our growth trajectory is rapidly accelerating.About the Role:As a pivotal member of our engineering team, you will tackle complex technical challenges ranging from building AI agents for insider trading detection to scaling messaging archiving systems capable of processing tens of millions of messages daily. You will collaborate with a team of world-class engineers, making a significant impact on our innovative projects.This is a full-time, on-site Fullstack Software Engineer position based in New York City.Who You Are:You thrive in fast-paced environments and love to build innovative solutions.You seek deep ownership of the products you develop.You are passionate about understanding and serving the customers you build for.You possess excellent communication skills.You value teamwork and collaboration.You are based in New York City.Qualifications:3-5 years of industry experience.Proficient in Node.js and Python.Experience architecting secure, scalable systems on AWS.Experience in developing scalable data infrastructure.Knowledge of AI and machine learning algorithms.Ability to work effectively in a fast-paced startup environment.Experience in the financial industry is a plus, but not mandatory.Benefits:401(k) plan with 5% company match.Comprehensive medical, dental, and vision insurance.15 days of paid time off plus 11 company holidays and flexible sick leave.

About SomethingsAt Somethings, we are pioneering a revolutionary social wellness platform specifically designed for teens. Our mission is to create a supportive environment where young individuals can build meaningful relationships with mentors who truly understand them, are dedicated to their growth, and provide the guidance necessary for them to flourish.In the U.S., 25 million teens face mental health challenges, and each of the countless teens who engage with Somethings requires assistance. Our goal is to ensure that these individuals do not merely use the platform, but instead connect with compassionate humans who are devoted to their well-being and help them thrive.With backing from General Catalyst and esteemed healthcare and consumer investors, we are experiencing rapid growth — achieving a remarkable 1100% increase in 2025 and aiming for a fivefold growth in 2026.If you aspire to contribute to a transformative company within the mental health sector, we welcome you to join us.Role OverviewWe are seeking a Senior Fullstack Software Engineer specializing in React to join our dynamic, high-impact engineering team. You will play a pivotal role in constructing the foundational web experiences that empower our mentors and operational teams.This position offers high levels of agency, craftsmanship, and impact:You will directly influence the platform experiences that assist teens in connecting and genuinely improving their lives.What You'll DoIn this role, you will take complete ownership of essential projects that align with our strategic objectives for 2026:1. Transform our Mentor Operations Platform into a world-class experienceDeliver web experiences that are fast, reliable, and deeply human-centric.Evolve the mentor web experience from basic functionality to a cohesive, elegant, and leading-edge platform.Create user interfaces that are as intuitive and refined as the best consumer applications.Prioritize performance, accessibility, and interaction quality.2. Develop tools that safely scale our mentor operationsDesign features for mentors that enhance consistency, speed, and connection.Implement safety measures that proactively identify risks and minimize human error.Refine mentor workflows to empower users rather than overwhelm them.3. Take charge of full-stack product developmentBuild comprehensive features across React, backend services, and APIs.Engage in close collaboration with design, product, growth, and clinical operations teams.

Role Overview Sigma Computing is growing its engineering team in New York City. The Senior Fullstack Software Engineer will help shape how users explore and interact with data. This role focuses on building technology that makes data more accessible and intuitive for a broad audience. What You Will Do Work on complex problems to create interactive experiences for data warehouse users, making analysis and exploration easier. Use modern programming languages and tools, including Rust, Go, GraphQL, and Kubernetes, throughout the development process. Build infrastructure to support Sigma Computing's cloud application. Develop algorithms and techniques that improve performance and interactivity in a multi-tenant cloud environment. Design and implement new features and technologies for a rapidly expanding user base. Collaborate across backend, frontend, design, product, customer support, sales, and marketing teams to deliver a strong product.

About Waterfall:At Waterfall, we are pioneering a revolutionary trading protocol designed for rare NFTs and collectible digital art, featuring live on-chain pricing. Our mission is to enhance the liquidity and composability of NFTs by creating innovative infrastructure and auction mechanisms. We have conceptualized a unique trading system allowing users to trade shards to forecast NFT prices, enabling rapid price discovery for any listed asset.Supported by Electric Capital and Pantera Capital, our dynamic and agile team is committed to fostering an inclusive culture. We aim not only to make a significant impact in the NFT space but also to ensure that Waterfall is the ideal workplace for your future aspirations. To stay informed and connected, be sure to follow our socials and explore our website!

About UsAt Maybern, we are revolutionizing the fund management landscape for private fund managers through innovative technology solutions. Founded by industry-leading engineering experts, our focus is on delivering exceptional software tailored to the needs of the fund management sector.With private funds managing over $15 trillion in capital and experiencing a remarkable 20% year-over-year growth, there is an increasing demand for top-tier software that addresses regulatory challenges and enhances transparency for CFOs.Maybern is dedicated to equipping investment managers with user-friendly and adaptable fund management software, allowing them to concentrate on their primary goal: maximizing investor returns. We are proud to be supported by prominent venture capital firms and a diverse array of strategic investors.Based in New York City, Maybern fosters a collaborative in-office culture and is eager to welcome talented individuals to our team.

P-1473 At Databricks, we are dedicated to empowering data teams to tackle the world's most challenging issues — whether that's bringing the next mode of transportation to life or accelerating groundbreaking medical advancements. Our mission is fulfilled through the creation and operation of the world's premier Data Intelligence Platform, enabling our clients to harness deep data insights to enhance their operations. Born from an engineering background and fueled by customer-centricity, we eagerly embrace every opportunity to confront technical challenges — from designing next-generation UI/UX for data interaction to scaling our services and infrastructure across millions of virtual machines. And this is just the beginning. As one of the pioneering fullstack engineers at our NYC Engineering office, you’ll join a dynamic team committed to innovating and building new products from the ground up. Our aim is to leverage the capabilities of Databricks in data and AI to deliver vertical AI applications tailored for both technical and business users. This role embodies a true 0-to-1 environment, blending the excitement of a startup with the resources of a tech powerhouse like Databricks. Your primary challenge will involve utilizing the latest UX/UI technologies to craft intuitive yet robust interfaces for complex data and workflows. Your team is adopting a UI-first and GenAI-first strategy in product development. You may work on challenges such as: Designing interfaces for GenAI agents capable of generating intricate workflows while ensuring human oversight through transparency and inspectability. Creating sophisticated visualizations, including data pipelines, data mappings, customer journey flows, identity graphs, and more. Establishing mechanisms that promote product-led growth through effortless onboarding and sharing functionalities. Fostering an interactive environment for collaborative data projects at scale with a seamless transition to production.

Role Overview StubHub Inc. is hiring a Senior Fullstack Software Engineer focused on Sponsored Listings. This position is based in New York, NY. What You Will Do Design, build, and improve fullstack applications that support Sponsored Listings on the StubHub platform. Work closely with teams across product, design, and engineering to deliver features that improve user experience and engagement. Contribute ideas and solutions that help connect fans to live events more effectively. Team and Impact This role partners with cross-functional groups to deliver solutions aligned with business goals. The work directly supports StubHub’s mission to connect fans with live events.

Join our dynamic team at flex as a Staff Software Engineer, Fullstack (Marketing). In this role, you will be instrumental in developing innovative software solutions that enhance our marketing efforts. You will collaborate with cross-functional teams to design, implement, and optimize our software applications, ensuring a seamless user experience.

Vendelux empowers organizations to uncover the most impactful events. Event marketers are pivotal to the growth of successful companies, orchestrating everything from lead generation to brand building throughout the year. Our mission at Vendelux is to enhance the effectiveness of every event a company sponsors and attends.As a Series A SaaS enterprise, we serve as the definitive system of record for event marketing. Our innovative software platform delivers proprietary insights that enable high-growth companies to identify the events, conferences, and trade shows with the highest return on investment. Our AI-powered solutions have been described by clients as an event marketer’s dream.Founded in 2021, Vendelux recently secured $14 million in Series A funding led by FirstMark, an investor in renowned companies including Shopify, Pinterest, Discord, and Airbnb. Our leadership team comprises veterans from top firms such as Bain, ZoomInfo, Shutterstock, Compass, and more.While data-driven marketers enjoy myriad tools for optimizing their digital ad spend, event marketers have been somewhat underserved—until now. We create advanced tools that enable event marketers to make data-informed decisions, transcending the traditional limitations of merely scanning badges.As we expand, we are seeking Senior Software Engineers who can deliver critical features and implement significant infrastructure enhancements.

About RainAt Rain, we are pioneering the future of payments on a global scale. Our dedicated team of innovative builders and seasoned founders is committed to making stablecoins practical for everyday transactions. With our advanced infrastructure, we facilitate card transactions, cross-border payments, B2B transactions, remittances, and much more. By collaborating with fintech companies, neobanks, and various institutions, we empower them to deliver solutions that are not only global but also inclusive and efficient. Join us to create significant change at a rapidly growing company backed by leading investors in the fintech, crypto, and SaaS sectors, including Sapphire Ventures, Norwest, Galaxy Ventures, Lightspeed, and Khosla. If you are driven, curious, and eager to contribute to a borderless financial future, we want to connect with you.Our PhilosophyWe embrace a culture of openness and flat hierarchies, allowing you to develop in a role that aligns with your aspirations. All team members, regardless of their position, are encouraged to explore ideas and influence the direction of the company.Role OverviewAs a Fullstack Software Engineer at Rain, you will play a pivotal role in developing our rewards and co-brand platform. Your responsibilities will include maintaining, enhancing, and building third-party rewards programs, primarily in collaboration with our major league sports partners, and integrating new payment solutions into these applications. You will take charge of the technology stack and code that underpins our rewards and co-branded payment initiatives.Key ResponsibilitiesContribute significantly to the technical and product roadmapDevelop products across our stack utilizing React, Typescript, NextJS, Tailwind, and NodeJS, focusing on RewardsLead architectural decisions and drive the technical roadmap as we scaleEngage with smart contracts across multiple blockchain networksQualificationsProficiency in JavaScript, React, Typescript, NextJS, Tailwind, NodeJS (experience in a subset of these technologies is acceptable)A passion for building, including personal projects that showcase your skillsThis role is suited for candidates with 4+ years of experience; compensation will be aligned with your backgroundPreferred QualificationsExperience in fintech (particularly with neobanks or card issuance is a plus)Familiarity with decentralized applications (dApps)

About Gusto Gusto supports over 400,000 small businesses nationwide by handling payroll, health insurance, 401(k) plans, and HR services. This work helps business owners focus on what matters most to them and their customers. With offices in Denver, San Francisco, and New York, Gusto aims to build a workplace that reflects the diversity of the communities it serves. Full-time employees receive competitive salaries, a comprehensive benefits package, and equity in the form of RSUs. Compensation varies by role, level, and location. Details about Gusto’s approach to rewards can be found on their Total Rewards philosophy page. AI plays a key role in daily operations at Gusto. Team members are expected to use AI tools relevant to their work and continue building their skills as technology evolves. The level of AI experience required depends on the position and will be assessed during the interview process. Role Overview: Staff Software Engineer – Payments & Risk Gusto is hiring experienced full-stack engineers for teams working on payments and risk platforms. These systems serve small business owners every day. Staff Software Engineers in this group work across the full lifecycle of payments or risk systems: shaping architecture early in design, building internal features and APIs, and maintaining performance after launch. The work includes engineering the core business engine, providing reliable backend services for product teams, and setting a high standard for engineering practices. Team Focus Areas Payments: The Payments team manages all financial transaction operations for Gusto’s products. This includes ensuring secure fund transfers among partners, employers, employees, and government agencies. Engineers on this team build new payment features for both U.S. and international markets and help redesign the payments platform to support future growth. Risk: The Risk team develops systems that protect Gusto and its clients from financial risks. This work shapes experiences that keep customers and the company safe. Location This role is based in San Francisco, CA (hybrid) or New York, NY (hybrid).