Senior Software Engineer - Marketplace Foundation

Role Overview Hopper is looking for a Senior Software Engineer to help build the foundation of our AI Fintech platform. This role focuses on designing and developing software that supports new financial technology products. The work directly impacts how customers interact with financial tools powered by AI.

About the Role Hopper is looking for a Senior Software Engineer with a focus on AI and fintech. This fully remote role centers on building software that improves financial technology products. The work blends artificial intelligence with practical tools that help users make smarter financial choices. What You Will Do Develop and refine AI-driven features for fintech applications Work with a team to design software that simplifies financial decision-making for users Apply expertise in artificial intelligence to real-world financial technology challenges Location Remote within the United States

Join Field AI, where we are revolutionizing the future of robotics through intelligent AI systems. Our mission is to create transformative, risk-aware, and reliable robotics solutions that tackle complex challenges in real-world settings, enabling robots to unlock their full potential. We focus on innovative approaches that surpass conventional data-driven methodologies and purely transformer-based architectures. Our globally deployed solutions are already yielding remarkable results, continuously enhanced through practical field applications.Are you passionate about shaping the future of AI-powered robotics? Do you excel at the crossroads of advanced autonomy, real-world implementation, and AI-driven decision-making? We are looking for a Robotics AI Engineer specializing in Field Foundation Models and Dynamics Foundation Models. In this pivotal role, you will design, develop, and deploy state-of-the-art AI-driven planning and control frameworks, ensuring our robots navigate effectively in unpredictable and high-pressure environments. This is a unique opportunity to redefine embodied AI, collaborating with a talented team that values innovative thinking, practical execution, and an AI-focused engineering approach. If you’re excited about creating adaptive, intelligent autonomy that learns and evolves beyond traditional models, we want to connect with you!

Join Our MissionFoundation is on the lookout for exceptional engineers to propel our mission of modernizing the homebuilding industry and enhancing the journey of purchasing, selling, and owning homes.About UsWith an impressive backing of $6.8 million from top venture capitalists, including Y Combinator, Foundation is formed by a team of former Opendoor professionals dedicated to revolutionizing residential real estate.Our flagship product serves as a pioneering customer experience platform tailored for homebuilders, akin to “Shopify for Homebuilders.” We collaborate with large-scale homebuilders to provide a cutting-edge digital customer experience, significantly boosting customer satisfaction and team productivity. In just two years, we’ve achieved notable product-market fit and rapid growth, supported solely by contract design.Our Growth PhasesWe are currently navigating the first of three interconnected growth phases:Innovative, AI-driven vertical SaaS for homebuilding - a public-scale potential in its own right.The enterprise ecosystem for real estate - enabling collaboration among adjacent trillion-dollar industries including lending, title, home insurance, and home services.The AI-native home operating system and interface - leveraging the network effects of the enterprise ecosystem to deliver transformative AI experiences for homebuyers and homeowners. Discover, purchase, and manage your home seamlessly with Foundation.Your RoleIn this pivotal role, you will contribute to creating the most reliable and modern customer experience platform within the homebuilding sector, transitioning traditional workflows into the AI era with insight, pragmatism, and empathy.You will work closely with product and customer teams, engaging in comprehensive stack development, collaborating with design and go-to-market teams, and owning significant portions of the platform from initial discovery to production refinement. Our focus is on real businesses, real revenue, and real users who require robust and reliable tools.

Join Zip as a talented Software Engineer in our AI Foundation team, where you'll play a crucial role in developing innovative AI solutions. This position offers the opportunity to work on cutting-edge technologies and contribute to projects that impact millions. If you have a passion for artificial intelligence and software development, we want to hear from you!

Join PushPress as a Senior Software Engineer in Fintech!At PushPress, we're revolutionizing the boutique fitness industry with our AI-driven gym management platform. Our innovative solutions empower fitness owners to operate more effectively and enhance the member experience within a $100 billion global fitness ecosystem. With over 5,000 gyms and 500,000 members trusting our platform, we process nearly $1 billion in payments each year.As a Series B company backed by Altos Ventures, StepStone, and Mucker Capital, we are committed to leveraging AI technology to enrich the human aspects of fitness. Our AI Assistant, AI Member Intelligence, and advanced reporting tools transform how gym owners and coaches work, enabling them to make informed decisions and explore new revenue opportunities.We pride ourselves on our team of passionate builders and fitness enthusiasts, united in our mission to empower independent fitness entrepreneurs. If you’re ready to be a part of this transformative journey, we want to hear from you!About the RoleWe are in search of a Senior Software Engineer specializing in Fintech to take charge of our critical billing platform. This pivotal engineering role will involve designing, developing, and scaling the systems that facilitate our payment processing across a diverse marketplace.You’ll leverage your extensive experience with Stripe Connect and intricate payment workflows to elevate our billing platform. Collaborating closely with Staff Engineers, product managers, designers, and finance teams, you’ll craft solutions that deliver tangible benefits to gym owners and their members. In this senior position, you’ll influence technical strategy, set high standards for the team, and oversee project outcomes from inception to completion.

At Headway, we're on a transformative mission to establish a mental health care system that is accessible to everyone. Our innovative technology connects individuals with exceptional therapists through the first software-enabled national network of insurance-accepting providers.With 1 in 4 people in the US experiencing treatable mental health conditions, the lack of insurance-accepting providers makes therapy prohibitively expensive for many. Headway is committed to creating an inclusive mental healthcare system by simplifying the process for therapists to accept insurance and expand their practices.Founded in 2019, Headway has evolved into a diverse national network comprising over 60,000 mental health care providers across all 50 states, who have collectively impacted more than 1 million patients. As a Series D company, we've raised over $325 million in funding from leading investors including a16z (Andreessen Horowitz), Accel, GV (formerly Google Ventures), Spark Capital, Thrive Capital, Forerunner Ventures, and Health Care Service Corporation.We aim to make your time with us the most rewarding of your career. Join us in our quest to revolutionize mental healthcare for the better.About this Role:Building trust is essential in our mission to make mental healthcare more accessible and affordable across the United States. Patients share sensitive information, payers expect robust controls, and providers require dependable, secure infrastructure. Trust Foundations is dedicated to instilling confidence in our products by protecting user data. We create out-of-the-box identity, access, and secure data platforms that empower other engineering teams. Our goal is to ensure that the most secure path is also the most efficient, allowing clinicians, patients, and payers to place their trust in Headway.This is an exciting time for our growing team, and we are looking to fill multiple roles at both mid and senior levels. As a Software Engineer/Senior Software Engineer on our Trust Foundations team, you will contribute by writing production code daily while shaping the long-term vision for trust at Headway. You will translate open standards such as OAuth 2.0/OIDC, RBAC/ABAC, and envelope encryption into scalable building blocks, integrate privacy-by-design and reliability principles into our developments, and mentor engineers across the company in trust-first thinking.Your Responsibilities:Design, build, and operate core trust primitives - authentication providers, authorization engines, encrypted data stores, and tamper-evident telemetry.Collaborate with cross-functional teams to enhance system security and user experience.Advocate for best practices in secure software development.

Join SoFi as a Senior Software Engineer in our Data Foundations team, where you will play a pivotal role in shaping our data architecture and enhancing our data-driven capabilities. You will work closely with cross-functional teams to develop robust data solutions that empower our business decisions and improve customer experiences.As a Senior Software Engineer, you will leverage your expertise in data engineering, software development, and cloud technologies to build scalable data pipelines and maintain high-quality data infrastructure. Your contributions will directly impact our ability to deliver innovative financial solutions.

About Our TeamThe Applied Foundations team at OpenAI is at the forefront of safeguarding our innovative technology against diverse adversarial threats. Our primary mission is to ensure the integrity and security of our platforms as they grow.We are dedicated to defending against financial misuse, large-scale attacks, and other forms of exploitation that could compromise user experience or destabilize our operations. The Integrity Foundations team lays the groundwork and infrastructure to support this critical mission.About the RoleAt OpenAI, we aim to advance artificial intelligence in a manner that is safe, reliable, and aligned with broader societal values. The role of Software Engineer in Applied Foundations is vital for maintaining the dependability of our platforms. You will play a key role in developing strong defenses against a variety of adversarial behaviors that threaten our ecosystem.In this position, you will collaborate with our entire engineering team to design and implement systems that detect and prevent abuse, promote user safety, and mitigate risks across our platform. You will be at the forefront of our initiatives to responsibly and sustainably harness the vast potential of AI.Key Responsibilities:Design and enhance systems to identify and prevent various forms of abuse, including financial fraud, botting, and scripting.Work collaboratively with cross-functional teams to create solutions that defend against adversarial attacks while preserving an optimal user experience.Assist in responding to active incidents on the platform and develop new tools and infrastructure to address fundamental challenges.You will excel in this role if you:Possess a minimum of 3 years of professional experience in software engineering.Have experience in setting up and maintaining production backend services and data pipelines.Exhibit a humble attitude, a willingness to support colleagues, and a commitment to team success.Demonstrate self-direction and enjoy innovating solutions to complex problems.Take ownership of issues from start to finish and are eager to acquire any necessary knowledge to achieve your goals.Have a passion for AI safety in production environments and the skills to build effective software systems.

Founded in 2007, Airbnb has transformed the way people travel and connect. From humble beginnings with just three guests in a San Francisco home, we have grown to a global community of over 5 million hosts who have welcomed more than 2 billion guest arrivals across nearly every country. Our hosts provide unique accommodations and experiences that foster authentic connections with local communities.Join Our Talented Community:As a member of Airbnb's App Foundation team, you will collaborate across platforms to create high-quality, performant capabilities that enhance nearly all features within the Guest and Host ecosystems.Our primary focus is on developing App Product Frameworks, Insights & Logging, Performance & App Health, and Feature Architecture. We work hand in hand with Product, Design, Platform (iOS/Android/Web), Analytics Infrastructure, Data Platform, and other Product Foundation teams to establish cohesive paved paths and standards at scale. We pride ourselves on a culture that values technical excellence, pragmatic decision-making, robust ownership, and a steadfast commitment to enhancing both developer and user experiences through foundational work.Your Impact:Collaborate with cross-functional partners (design and product) to explore, shape, and implement new product experiences from ideation to large-scale execution.Develop efficient and reusable backend capabilities that prioritize quality while ensuring performance and scalability.Lead initiatives that significantly enhance Guest and Host experiences by improving app responsiveness and ensuring reliable performance across critical backend systems impacting millions.Establish a performance roadmap by identifying bottlenecks, prioritizing impactful work, and delivering enhancements across services, data access patterns, and infrastructure.Elevate performance engineering standards by creating tools, benchmarks, and guardrails that prevent regressions and integrate performance considerations into team workflows.Influence architecture and standards across Airbnb's backend ecosystem to improve observability, efficiency, and adaptability of systems.A Day in Your Life:Join us in making a difference for millions of users worldwide by building the backend foundations that power the Airbnb experience.

Join Us as Our First Marketing LeadFoundation is on the lookout for our inaugural marketing leader to propel our vision of revolutionizing homebuilding and enhancing the journey of buying, selling, and owning a home.About FoundationWith approximately $6.8M in backing from top-tier venture capitalists, including Y Combinator, Foundation is composed of a dynamic team formerly from Opendoor, dedicated to reshaping the future of residential real estate.Our flagship product is a cutting-edge customer experience platform designed specifically for homebuilders—think of it as the "Shopify for Homebuilders." We collaborate with large-scale homebuilders to deliver a modern digital experience, significantly boosting customer satisfaction and team productivity. In just two years, we've achieved remarkable product-market fit and impressive growth, all without a dedicated marketing team.Our Growth JourneyWe are currently navigating the first of three interconnected growth phases:AI-Driven SaaS for Homebuilding: A transformative opportunity with public-scale potential.Real Estate Enterprise Ecosystem: Homebuilders drive this ecosystem, which fosters collaboration among adjacent trillion-dollar sectors such as lending, title, home insurance, and retail.AI Native Home Operating System: This will enable seamless home buying and ownership through our platform.Your Role as Our First MarketerWe seek a hands-on, results-driven marketer passionate about transforming a key sector of the U.S. economy and redefining marketing in the age of AI.Key ResponsibilitiesYou will be pivotal in steering Foundation's next growth phases by integrating AI with marketing and real estate innovation. Your primary objectives will include:Accelerating Growth: Drive rapid expansion of our core AI-driven product line for homebuilders.

About Glean:Established in 2019, Glean is a pioneering AI-driven knowledge management platform that empowers organizations to swiftly locate, organize, and disseminate information throughout their teams. By seamlessly integrating with tools such as Google Drive, Slack, and Microsoft Teams, Glean ensures that employees have timely access to essential knowledge, thereby enhancing productivity and collaboration. Our state-of-the-art AI technology streamlines knowledge discovery, facilitating a more efficient utilization of collective intelligence across teams.Glean originated from Founder & CEO Arvind Jain’s profound insight into the challenges that employees encounter while seeking and comprehending information at work. Witnessing firsthand how fragmented knowledge and a multitude of SaaS tools hindered productivity, he aimed to create an enhanced solution – an AI-powered enterprise search platform that enables rapid and intuitive access to necessary information. Since its inception, Glean has transformed into a leading Work AI platform, merging enterprise-grade search, an AI assistant, and robust application and agent-building capabilities to fundamentally reshape the modern workplace.About the RoleWe are in search of a Software Engineer to become a vital member of Glean’s Data Foundations team—the unit responsible for the comprehensive data ingestion and management layer that powers Glean’s Search, AI Assistant, and Agent offerings across a multitude of enterprise applications and vast quantities of documents.Your contributions will directly influence the quality, timeliness, and reliability of the knowledge that each Glean user engages with daily.Your Responsibilities Include:Ingestion & ConnectivityDevelop and enhance connectors for a diverse array of SaaS and on-premise systems (including Google Workspace, Microsoft 365, Slack, Salesforce, Jira, ServiceNow, GitHub, etc.).Ensure the seamless integration and continuous improvement of data flows to maintain system performance and reliability.

Join versant3 as a Senior Software Engineer specializing in Payments and Fintech. In this role, you will leverage your expertise to develop innovative solutions that enhance our payment processing systems. You will collaborate with a talented team to drive projects from conception to deployment, ensuring high performance and reliability.

About Basic CapitalBasic Capital is revolutionizing the $1 trillion retirement sector in America through innovative fintech solutions. Our goal is to develop a mortgage for retirement that democratizes wealth accessibility for all Americans. We are crafting a new retirement ecosystem by creating cutting-edge products, platforms, and a credit marketplace.Our founding team comes from prestigious backgrounds, including Goldman Sachs, Uber, Block, Stripe, and Robinhood. Supported by esteemed investors such as Lux Capital, Forerunner Ventures, BoxGroup, SVAngel, Inspired Capital, and Henry Kravis, we are headquartered in SoHo, NYC, and are building a dynamic, high-performance team dedicated to addressing wealth inequality.For more details, please visit Basic Capital’s website.Your RoleJoin as a key member of a team focused on enhancing customer experience and operational excellence at Basic Capital.Quickly develop and implement solutions to meet urgent customer demands.Become well-versed in our systems end-to-end, triaging and creating rapid solutions for high-priority requests.Create internal dashboards and monitoring tools that provide real-time insights into customer health.Contribute to architecture discussions, planning sessions, and code reviews across different teams.

About GranicaGranica is an innovative AI research and infrastructure firm dedicated to creating reliable and steerable representations of enterprise data.We build trust through our product Crunch, a policy-driven health layer that ensures large tabular datasets remain efficient, reliable, and reversible. On this solid foundation, we are developing Large Tabular Models—systems designed to learn cross-column and relational structures in order to provide trustworthy answers and automation with inherent provenance and governance.Our MissionAI is currently hampered not only by the design of models but also by the inefficiencies of the data that supports them. Every redundant byte, poorly organized dataset, and inefficient data pathway contributes to significant costs, latency, and energy waste as we scale.Granica aims to eliminate these inefficiencies. We merge cutting-edge research in information theory, probabilistic modeling, and distributed systems to craft self-optimizing data infrastructures: systems that consistently enhance the representation and utilization of information by AI.Our engineering team collaborates closely with the Granica Research group led by Prof. Andrea Montanari of Stanford University, bridging advancements in information theory and learning efficiency with large-scale distributed systems. Together, we firmly believe that the next major advancement in AI will stem from breakthroughs in efficient systems rather than merely larger models.Your ContributionsGlobal Metadata Substrate: Design a transactional and metadata substrate that facilitates time-travel, schema evolution, and atomic consistency across massive petabyte-scale tabular datasets.Adaptive Engines: Develop systems that autonomously reorganize data, learning from access patterns and workloads to maintain peak efficiency without the need for manual tuning.Intelligent Data Layouts: Optimize bit-level organization (including encoding, compression, and layout) to maximize signal extraction per byte read.Autonomous Compute Pipelines: Create distributed compute systems that scale predictably, adapt to dynamic loads, and ensure reliability under failure conditions.Research to Production: Apply new algorithms in compression, representation, and optimization that emerge from ongoing research. We encourage opportunities to publish and open-source your work.Latency as Intelligence: Design systems that inherently minimize latency as a measure of intelligence.

About Foundation HealthAt Foundation Health, we are at the forefront of reshaping the healthcare landscape through our innovative AI-driven digital pharmacy platform, designed to unify operational frameworks with exceptional patient experiences. Our goal is to revolutionize patient-centric care by bridging gaps in infrastructure, enhancing care coordination, and alleviating obstacles within the patient journey. We are committed to challenging conventional practices, actively spearheading solutions that will redefine future healthcare methodologies.Realizing this ambitious vision necessitates a dedicated team driving us towards success. We believe that an encouraging and dynamic work environment nurtures creativity, catalyzing it into transformative innovation. This innovation not only propels our organization forward but also enriches the lives of our employees, partners, and most importantly, our patients.At Foundation Health, we cultivate a culture that inspires our team members to expand their horizons, inviting them to infuse their enthusiasm and curiosity into their daily work. We recognize that diverse viewpoints stimulate progress; hence, we actively seek individuals who share our dedication to excellence and forward-thinking approaches.The Mission: Transforming Healthcare Through CodeThe healthcare industry is rife with convoluted, outdated workflows. We believe that thoughtfully implemented AI can simplify these systems, enhancing the experiences of both providers and patients.We are particularly focused on innovating within the pharmacy sector. Our AI-powered solutions seamlessly integrate with Electronic Health Record (EHR) systems, empowering health organizations to operate efficiently on a larger scale. This is not about superficial tools—it's about creating profound, integrated infrastructures that fundamentally transform care delivery.The Team: Designed for AI ExcellenceOur technical leadership team boasts extensive experience in high-scale engineering, including our new VP of Engineering from DeepMind/Google. We are nurturing an

About Retell AIAt Retell AI, we are pioneering the future of call centers through innovative voice AI technology. Our cutting-edge solutions are transforming how companies engage with customers.In just 18 months since our inception, we've empowered thousands of businesses with our AI voice agents that efficiently manage sales, support, and logistics calls, significantly reducing the need for large teams of human agents. Supported by industry-leading investors including Y Combinator and Alt Capital, we've grown our annual recurring revenue from $5M to an impressive $36M while expanding our team from 5 to 20 talented individuals since 2025.Our ambitious vision for 2026 is to develop a state-of-the-art customer experience platform where entire contact centers are driven by AI. Unlike basic automation requiring constant human oversight, we’re engineering intelligent AI “workers” capable of serving as frontline agents, quality assurance analysts, and managerial roles, all while optimizing customer interactions continuously.We are rapidly expanding and seeking driven builders who thrive on solving complex technical challenges, act decisively, and wish to make a tangible impact in one of the fastest-growing voice AI startups.Join us in shaping the future!Recognized as a top 50 AI application in the a16z list: https://tinyurl.com/5853dt2xRanked #4 in Brex's Fast-Growing Software Vendors of 2025: https://www.brex.com/journal/brex-benchmark-december-2025Featured among the top startups on: https://leanaileaderboard.com/

At Mercury, every new customer who applies for a bank account represents a new star igniting in a vast universe of possibilities. Initially, it may seem like a mere spark, but a closer examination reveals an intricate constellation of identity verification, ownership checks, sanctions screening, and fraud signals—all interconnected by invisible forces. The Risk Engineering team acts as the guiding navigation system for this expansive universe. Our mission is to safely guide thousands of ambitious individuals through Mercury’s orbit each day—each with a unique trajectory, risk profile, and narrative. We operate at escape velocity: moving swiftly, making confident decisions, and safeguarding the system without hindering the builders who depend on us. When we excel, founders can open bank accounts in delightful minutes rather than days, without needing to worry about the underlying complexities. We are on the brink of a new era. We are developing intelligent AI systems that do not merely assess risk but can reason about it—systems capable of investigating, deciding, escalating, and learning. These agents will enhance our KYC Refresh, EDD, ODD, and compliance workflows, propelling our operations to unprecedented levels of efficiency and scale. Our goal: to reduce manual labor, detect risks earlier, make sharper decisions, and create experiences that are almost magical in their simplicity. Now, we invite you to join us. We are seeking a Senior Software Engineer who is inspired by the prospect of bringing intelligent automation to life within real production systems. We need someone eager to design and implement AI-driven workflows that can think in steps, adapt to new information, and orchestrate complex decisions across people, models, and services. If you view compliance not as red tape but as a fascinating systems challenge at planetary scale, we want you. If you are excited about building impactful AI that safeguards millions of dollars, opens doors for founders globally, and helps shape the future of banking, we would love to explore this journey together. *Mercury is a fintech company, not an FDIC-insured bank. Banking services provided through Choice Financial Group and Column N.A., Members FDIC.

At Databricks, we are driven by our commitment to empower data teams in tackling the world's most challenging problems — from transforming transportation solutions to accelerating medical advancements. Our mission revolves around constructing and maintaining the world's premier data and AI infrastructure platform, enabling our clients to harness deep data insights for enhanced business outcomes.Foundation Model Serving represents the API product designed for hosting and serving advanced AI model inference, catering to both open-source models like Llama, Qwen, and GPT OSS, as well as proprietary models such as Claude and OpenAI GPT. We welcome engineers who have experience managing high-scale operational systems, including customer-facing APIs, Edge Gateways, or ML Inference services, even if they do not have a background in ML or AI. A passion for developing LLM APIs and runtimes at scale is essential.As a Staff Engineer, you will play a pivotal role in defining both the product experience and the underlying infrastructure. You will be tasked with designing and building systems that facilitate high-throughput, low-latency inference on GPU workloads with cutting-edge models. Your influence will extend to architectural direction, working closely with platform, product, infrastructure, and research teams to deliver an exceptional foundation model API product.The impact you will have:Design and implement core systems and APIs that drive Databricks Foundation Model Serving, ensuring scalability, reliability, and operational excellence.Collaborate with product and engineering leaders to outline the technical roadmap and long-term architecture for workload serving.Make architectural decisions to enhance performance, throughput, autoscaling, and operational efficiency for GPU serving workloads.Contribute directly to critical components within the serving infrastructure, from systems like vLLM and SGLang to developing token-based rate limiters and optimizers, ensuring seamless and efficient operations at scale.Work cross-functionally with product, platform, and research teams to transform customer requirements into dependable and high-performing systems.Establish best practices for code quality, testing, and operational readiness while mentoring fellow engineers through design reviews and technical support.Represent the team in inter-departmental technical discussions, influencing Databricks’ wider AI platform strategy.