Full-Stack Product Engineer at Valthos | New York

We are seeking a talented and driven Full Stack Engineer to join our dynamic team at mlabs in New York. In this role, you will be responsible for developing and maintaining our web applications, ensuring a seamless user experience while collaborating with cross-functional teams to deliver high-quality software solutions.

Founding EngineerLocation: New York, NYOn-site | Full-timeCompensation: $150K - $350KJoin a dynamic, venture-backed startup on a revolutionary journey to redefine technical interviewing and reshape the expansive $600 billion staffing sector. Our client is pioneering innovative methods that transcend traditional coding challenges, enabling organizations to better identify talent, prevent fraud, and showcase elite candidates to Fortune 500 companies.At this pivotal moment of growth, having achieved product-market fit and now scaling rapidly, the company has secured a $3.1 million seed round from distinguished investors, including GSV Ventures, BoxGroup, and notable angel investors from OpenAI, SpaceX, and Retool. With revenue exceeding seven figures, their clientele includes top enterprise staffing firms, including the world’s largest staffing company.We are looking for a Founding Engineer to become part of a highly skilled team of seven, comprised of talent from prestigious institutions and renowned companies like Stanford, Penn, Waterloo, Retool, and MongoDB. This role is ideal for an innovative builder eager to take ownership of critical systems and set technical standards for an entire industry.Key Responsibilities:Innovation in Evaluation: Develop and establish new benchmarks for technical interviewing, creating systems that replace outdated evaluation techniques and deliver high-fidelity talent assessments.AI Implementation: Leverage AI and machine learning to detect fraudulent activities, identify intricate patterns in candidate performance, and expedite the hiring process.System Architecture: Architect, develop, and maintain essential full-stack systems from scratch, ensuring optimal performance and scalability.End-to-End Ownership: Oversee features and systems throughout their entire lifecycle—from initial concept and architectural design to deployment and monitoring.Strategic Input: As one of the first engineering hires, contribute significantly to shaping the technical roadmap and making critical architectural decisions.Requirements:Technical Proficiency: Minimum of 4 years of experience in modern full-stack development with advanced skills in React, Node.js, and Python (or similar frameworks).Infrastructure Knowledge: Experience managing cloud-native infrastructure within AWS, GCP, or Azure.Startup Mindset: Proven ability to excel in a fast-paced, high-performance startup environment where ambiguity is prevalent.Coding Fundamentals: Highly technical with a deep understanding of coding principles.

Reinforcement Learning EngineerJoin our innovative team at mlabs, a leading software development firm at the forefront of decentralized finance. We are dedicated to building the infrastructure for the world's largest crypto social networks and digital asset launchpads. Our mission-driven group of builders values speed, technical excellence, and exceptional talent.We are currently looking for a Reinforcement Learning (RL) Engineer who will be responsible for the end-to-end development of an RL-driven trading agent. This role involves managing real capital to enhance trading volume and user engagement within a dynamic memecoin ecosystem. The ideal candidate is an expert capable of integrating advanced modeling techniques with live financial operations. You will play a pivotal role in transitioning existing heuristic-based systems to learning-based methodologies while adhering to strict risk management protocols in a global 24/7 market.Key Responsibilities:Autonomous Agent Development: Lead the design, delivery, and refinement of an RL-driven trading agent to boost ecosystem engagement.Objective Function Design: Create reward functions and policies closely aligned with product objectives while implementing strict downside risk management.Validation Frameworks: Develop comprehensive evaluation and validation frameworks, including simulations and offline analyses, to minimize dependence on live testing.System Transition: Oversee the transition of existing heuristic-based systems to cutting-edge learning-based approaches safely.Technical Leadership: Act as the sole RL expert within a compact, high-performing team, responsible for the entire lifecycle from data modeling and deployment to monitoring and risk management.Interview Process:Recruiter / HR Call: Initial screening to discuss your professional background, risk management philosophy, and cultural fit.Technical Interview: In-depth assessment of RL architecture, simulation frameworks, and experience in live production.Final Interview: Strategic discussion with leadership focusing on alignment with our mission, role expectations, and long-term goals.

Senior Full Stack EngineerLocation: New YorkOn-site | Full-timeJoin mlabs, the driving force behind the world's largest memecoin launchpad. Our infrastructure is characterized by ultra-low latency, exceptional throughput, and a continual load, designed for an arena where precision is imperative and the stakes are sky-high.The RoleAs a Senior Full Stack Engineer, you will be pivotal in designing and scaling the future of crypto-social finance. This is not a conventional position; we operate at the forefront of Web3 innovation and seek an individual who excels under pressure.What You'll Do:End-to-End Ownership: Spearheading features from initial ideation to production deployment, exercising substantial autonomy.Full-Stack Architecture: Engaging with the complete stack—from robust backend systems to refined frontend interfaces—ensuring a cohesive and scalable user experience.Rapid Iteration: Quickly prototyping and deploying new features while maintaining system integrity.Complex Problem Solving: Tackling technical challenges unique to high-scale crypto platforms where efficiency reigns supreme.Collaborative Innovation: Partnering with a top-tier team of engineers and designers to push the boundaries of social finance.

About LiveFlowAt LiveFlow, we're revolutionizing the accounting and finance landscape by developing a cutting-edge platform that empowers lean finance teams to efficiently manage expansive enterprises.Having successfully secured over $21 million in funding from prestigious investors such as Y Combinator, YC Continuity, Valar, Seedcamp, WndrCo, Moonfire, and Bradley Horowitz (VP Product, Google), we've positioned ourselves as a frontrunner in the industry.Our platform is already assisting thousands of companies in optimizing their financial operations, evidenced by our hundreds of 5-star ratings on G2.Our founding team boasts experience from Europe's fastest-growing fintech, Revolut, which fuels our ambition and innovation. Why Join Our Team?At LiveFlow, you have the unique opportunity to shape your role based on your skills, passions, and aspirations.We encourage you to work intelligently, share your insights, and engage deeply with our mission and methodologies. Your contributions will be essential in cultivating an inspiring workplace culture and scaling our organization as we grow.Are you a problem solver? Our enthusiastic customers are eagerly waiting for the innovative solutions you'll bring forth. We face a multitude of stimulating challenges—both technical and non-technical—and while we may not have all the answers yet, we're committed to asking the right questions every day.If you take pride in customer satisfaction and are excited to contribute to a product that brings value, while maintaining a balance between detail and progress, we want to hear from you!

OffDeal is pioneering the future of finance as the world's first AI-native investment bank tailored for small businesses. Rather than simply providing AI solutions to established firms, we are reimagining what an investment bank could look like in 2025.While traditional Wall Street strategies excel in handling billion-dollar transactions, they often fall short in addressing the needs of smaller enterprises. Conventional firms typically rely on large teams and outdated systems, rendering smaller mergers and acquisitions (M&A) unviable. This gap has left countless small business owners without reliable options for their most critical sales.Our innovative engineering team has developed software that automates over 80% of analyst tasks using AI, allowing our dedicated bankers to concentrate on building trust with business owners and finalizing deals.Recently, we secured $12 million in Series A funding (totaling $17 million) from Radical Ventures and Y Combinator, propelling our rapid growth. Within less than a year, our team has successfully facilitated more than 30 sell-side M&A transactions, providing transformative exits for our clients—and we are just getting started.For more about our journey, explore the following articles:Financial Times ArticleCNBC Video InterviewThe Bull Case for AI-Native InvestmentYour RoleAs a Full Stack Engineer, you will collaborate closely with our CTO to develop our AI-native platform, empowering our investment bankers to enhance their productivity tenfold. Your contributions will significantly influence the transfer of $10 trillion worth of small businesses in the coming decade.Key ResponsibilitiesPartner with our investment banking team to lead projects from conception to deployment.Engage in full-stack development within our 100% TypeScript environment (ReactJS + NodeJS).Utilize cutting-edge AI technologies to enhance our internal systems.

Kontakt.io is revolutionizing the way care operations are managed.Our mission is to minimize waste, lower costs, and enhance revenue by optimizing asset utilization and boosting staff productivity.Leveraging AI, RTLS, and EHR data, our platform empowers self-learning agents to automate workflows, adapt in real-time, and seamlessly orchestrate all aspects of care delivery operations. It is designed for easy deployment and scalability, providing a comprehensive overview of spaces, equipment, and personnel, thereby eliminating inefficiencies and enhancing the patient experience. With a remarkable 10X return on investment and over 20 successful use cases, Kontakt.io stands as the preferred platform for expedited and improved care delivery operations.We invite you to join us in creating the next generation of patient-flow intelligence. As a Full Stack Engineer at Kontakt.io, you will design and develop systems that manage patient milestones, identify and mitigate discharge barriers, and proactively address unit-level bottlenecks. Your contributions will play a pivotal role in enhancing care delivery by automating escalations and facilitating high-census communications throughout hospital operations.

Join Claylabs as a Full Stack Software Engineer!At Clay, our mission is to empower organizations to bring their growth ideas to fruition. We believe that growth is a creative journey rather than a mere formula. Identifying and engaging with your ideal customers requires unique insights and continuous innovation. In a rapidly evolving AI landscape where tactics can be easily replicated, creativity stands as the true differentiator.We have successfully partnered with thousands of clients, including industry leaders like Anthropic, Notion, Google, and Ramp, helping them leverage unique data, insights, and AI-driven research to effectively market their offerings.As of 2025, we celebrated exceeding $100 million in revenue and secured a $100 million Series C funding round, achieving a valuation of $5 billion. Our growth is supported by esteemed investors such as Sequoia, CapitalG, and First Round. Additionally, we have successfully executed our second employee tender offer and initiated a community equity round for our customers, agency partners, and club members.Here are some key highlights about Clay:Our community consists of over 11,000 customers, 150+ integration partners, 125+ agencies, 50+ Clay clubs, and 30,000 members on Slack.Our culture is vibrant both inside and outside of work, featuring team members who are DJs, activists, writers, marathoners, and more.All employees have the opportunity to work alongside world-class coaches specializing in creativity, management, and more.Our guiding principles — including negative maintenance and non-attached action — shape our approach to work. Learn more about them here.You can read more about our achievements in the New York Times.

About BleeAt Blee, we are revolutionizing traditional workflows that often rely on spreadsheets and emails by introducing AI-driven software that unifies organizations to meet compliance requirements more efficiently, thoroughly, and transparently. Our platform is already empowering thousands of active users from numerous enterprise clients who are engaged in long-term contracts. Our leadership team boasts experience from prestigious organizations such as Adobe, Chime, PayPal, AWS, Wachtell, Harvard Law, and Columbia Law.We have engineered a unique platform that addresses the specific challenges faced by our customers from end to end. The ideal candidates for Blee will not only be adept problem solvers but also relish the challenge of identifying user needs, particularly as many of our users are new to products like ours.With offices in downtown San Francisco and New York City, our team is primarily distributed across these vibrant locations.The RoleThis Full Stack Engineer position is designed for a versatile generalist who excels at constructing solutions to specifications and tackling complex implementation challenges. While your expertise will span the entire technology stack, you will predominantly focus on backend services, database architecture, and infrastructure — laying the groundwork that powers our platform. You will translate product requirements into polished, production-ready features through close collaboration with engineering leadership, product teams, and customer-facing staff.

Join our dynamic New Patient Experience team at Talkiatry as a Senior Full-Stack Engineer. This innovative product team is dedicated to enhancing the patient journey from their initial interaction to their first appointment. By optimizing how new patients find, assess, and begin their care with us, we contribute significantly to Talkiatry's mission of making mental health services more accessible.In this pivotal role, you will spearhead the development of impactful features and systems aimed at increasing patient conversion rates and simplifying the onboarding process, ensuring a smooth digital start to care. You will work closely with product, design, and data teams to create robust, extensible, and maintainable systems using TypeScript, running on AWS.

Join Odyssey:At Odyssey, we are dedicated to revolutionizing access to exceptional education nationwide, irrespective of income or location. Our innovative technology simplifies educational choices for parents in the regions we serve. By collaborating with state agencies and educational vendors, we streamline the process that empowers parents to secure the essential tools for their children's success.As the pioneering company focused on education savings accounts (ESAs), our platform currently facilitates programs that assist over 200,000 students in accessing more than $2 billion in state funding.Role Overview:As a Full Stack Engineer at Odyssey, you will play a pivotal role in developing the foundational technology that drives our platform. Your work will span the entire technology stack, including program eligibility systems, educational fund ledgers, and a marketplace that allows schools and vendors to process tuition and service payments.This position emphasizes the creation of full-stack systems, which encompasses scalable services, APIs, data models, frontend user interfaces, and internal tools designed to support families, educational institutions, providers, and operational teams as our platform expands.By joining our dynamic team, you will utilize your expertise to make a tangible difference in the quality and accessibility of K-12 education throughout the United States.Your Responsibilities:Design, architect, and develop engaging functional experiences for users leveraging TypeScript, AWS Lambda, Next.js, and a variety of other technologies.Create, implement, and execute robust testing protocols to ensure the reliability and stability of our applications.Develop sophisticated database models with a focus on scalability and performance optimization.Build and maintain APIs for both public and internal utilization, enhancing our mobile applications and other systems.Collaborate with the product team to drive ongoing enhancements of Odyssey’s Marketplace platform.Work with cross-functional teams to identify challenges, devise solutions, and close product gaps.Encourage open communication within the team, sharing both obstacles and achievements transparently.Participate in system design, platform management, code reviews, and capacity planning.

GovWell builds AI-powered software to help local governments deliver better, faster services. By replacing outdated municipal systems, the team aims to cut processing times for permits and licenses by up to 90 percent. Since its founding in 2023, GovWell has enabled over 5,000 essential workflows for agencies in more than 30 states, reaching millions of residents. The company is headquartered in New York City and has raised $10 million in seed funding from Work-Bench and Bienville Capital. For more on GovWell’s story, see their recent feature in TechCrunch. Why work at GovWell? Meaningful mission: GovWell focuses on building AI-driven solutions that modernize government systems, aiming to improve how citizens interact with public agencies. WATCH: Mission & Vision with CEO & Co-Founder Troy LeCaire Real-world impact: The platform serves as the official record for government services, directly affecting millions of Americans. Projects range from streamlining small business permitting to supporting affordable housing initiatives. Startup growth: GovWell has achieved 4X ARR growth in the past year and continues to expand quickly. Early team members work closely with founders and take ownership of significant projects. Role overview The Full-Stack Software Engineer will help build and improve GovWell’s core platform, which powers faster and more efficient government services. This role involves working across both frontend and backend systems to design, develop, and launch new features that support government operations and resident access. Reporting directly to the CTO and Co-Founder, Ben Cohen, this engineer will take responsibility for key product areas and have the chance to shape the platform in a growing company based in New York.

Full Stack EngineerSalary: $170,000 – $225,000 • Meaningful EquityAbout NovigAt Novig, we are revolutionizing sports betting by creating America’s premier sports prediction market. Founded by visionaries Jacob Fortinsky and Kelechi Ukah, our platform uniquely offers commission-free sports trading, delivering enhanced pricing, complete transparency, and an efficient market structure by moving beyond the conventional sportsbook model.Supported by top investors from Silicon Valley, Novig has raised over $100 million from notable names such as Pantera, Forerunner, Lux, NFX, Paul Graham, and Joe Montana.Our MissionWe are dedicated to transforming a flawed system where the house consistently wins and fans lose. Our goal is to democratize and innovate sports betting, creating an equitable market where users are empowered.Why You Should Join UsEager to collaborate across the entire tech stack to develop advanced sports betting infrastructure.Leverage technologies from modern financial exchanges to promote transparent and efficient market practices while ensuring an enjoyable user experience.Significantly influence both the market engine and the user interface.Create and sustain a developer-friendly API experience for algorithmic trading and advanced users.Enhance product features by extending backend services and contributing to frontend components.Scale real-time data ingestion, processing, and distribution systems.Work closely with Design and Product teams to create efficient and user-friendly interfaces.Contribute to architectural and system design decisions across the technology stack.Enhance observability and reliability of both backend and frontend systems.Bring a passion for sports, markets, and technology, along with an inquisitive mindset for complex computer science challenges.Hold a Bachelor’s or Master’s degree in Computer Science or a related technical field.Possess a minimum of 3 years of professional experience in building full-stack applications.Demonstrate proficiency in a systems programming language.

Are you frustrated with the inefficiencies and complexities of traditional finance? At Superstate, we are too. We are pioneering investment solutions that leverage the rapid, programmable, and compliant nature of blockchain tokenization.In your role as a Senior Full-Stack Engineer, you will play a crucial part in guiding our team to develop exceptional user experiences that are distinctive, reliable, and scalable across all Superstate frontend platforms. You will have the chance to shape the direction, design, and implementation of future product experiences.

About Us:ether.fi is a leading player in the cryptocurrency sector, managing over $10 billion in assets with a dedicated team of 30 technical experts. Profitable since our inception, we focus on developing genuine consumer applications.We envision a future of on-chain banking with innovative products like Stake, Liquid, and Cash, allowing users to earn yields through diverse DeFi strategies and utilize their assets in the real world via our credit cards. Explore our public analytics for Cash and Stake.Position Overview:We are seeking a Senior Full Stack Software Engineer to take ownership of feature delivery for our core products. This position is integral to our engineering team, focusing on the complete development of user-facing features, including on-chain portfolio reporting, corporate card functionalities, DApp interfaces, banking transfers, and notification systems. Our roadmap includes everything a neobank would build.Responsibilities:Lead end-to-end feature delivery, working on both backend and frontend components.Collaborate with designers to define the scope and break down technical requirements for new features.Partner with fellow engineers to produce high-quality code and uphold engineering standards.Monitor core business metrics such as user adoption, revenue, and error rates.Qualifications:Solid foundation in software engineering principles and problem-solving skills.Proven track record of successfully launching products with a substantial user base.5+ years of professional coding experience.Motivated, hardworking, and committed to achieving ambitious goals as part of a driven team.Experience in the web3 space is a plus.Benefits:Competitive salary, performance-based bonuses, and token allocation grants.Flexible working hours and opportunities for professional growth.Access to comprehensive health benefits and wellness programs.

Patlytics develops AI-powered tools for patent intelligence, supporting legal and intellectual property teams as they protect and monetize IP. The platform relies on generative AI and large language models to simplify patent workflows, including drafting and litigation, and provides timely, accurate insights. After raising $40M in Series B funding led by SignalFire, Patlytics is expanding its product suite and growing its global presence. The company values diversity, creativity, and an entrepreneurial approach. Curiosity and a drive to improve IP intelligence shape the team’s work. Role overview The Full Stack Software Engineer will build and deliver features across the platform’s stack. This platform is trusted by Fortune 500 legal and IP teams. The position plays a part in reshaping how intellectual property is managed and protected.

About JuniorAt Junior, we are revolutionizing the investment research landscape with innovative LLM-powered tools designed specifically for private market investors. Our clientele includes some of the world's leading private equity and consulting firms, collectively managing billions in annual investments. As a profitable and bootstrapped startup, we pride ourselves on our dynamic team of 24 professionals located in both London and New York City.Discover more about our mission and values here. Role OverviewAs one of our inaugural engineering team members, you will have the exceptional chance to:Rapidly deliver high-quality featuresConceptualize and develop new methods for interacting with technologyEngage in pioneering projects involving LLMsCollaborate closely with our partners to drive growthInfluence product direction and prioritize initiativesHelp shape our engineering culture from the ground up Sample ProjectsDevelop innovative products to integrate diverse research inputsCreate a voice-to-voice survey tool that autonomously performs high-volume research tasks with minimal latencyLaunch a mobile application from the ground up within three weeksConstruct segmented knowledge graphs from the transformation of unstructured into structured dataDesign an AI-native CRM system linked to the aforementioned knowledge graph About YouWe are searching for product-focused full-stack engineers who:Are based in NYCAre enthusiastic about making substantial contributions to product strategyPossess excellent communication abilities and enjoy client interactionAre skilled in our technology stack: Next.js, TypeScript, PostgreSQLBonus points for experience in developing and designing AI-driven products!Are driven to build rapidly and efficiently

Become a Key Player in Revolutionizing Vehicle CheckoutAt Ekho, we are on a mission to transform the vehicle purchasing process with our groundbreaking online checkout solution, akin to the innovations of Tesla. Our platform has empowered more than 20 top-tier vehicle brands, generating significant revenue and enhancing their online sales capabilities.We are proud to have secured $17.5 million in funding from prestigious investors, including YCombinator and the Tesla alumni fund, and we partner with established brands and emerging market players alike.Position Overview: Full-Stack EngineerWe are in search of a motivated Full-Stack Engineer who excels in delivering high-quality code at remarkable speeds. You will enjoy a high degree of autonomy as you develop and manage features across our comprehensive vehicle sales platform, from user-friendly checkout interfaces to sophisticated dealer management tools.Our ideal candidate is versatile, user-focused, and thrives in dynamic settings, efficiently managing both frontend and backend development. This pivotal role involves architecting and deploying innovative features that simplify complex vehicle purchasing workflows, including financing, insurance, registration, and delivery coordination.

GovDash is at the forefront of empowering businesses to secure and manage government contracts that drive progress for American interests.Our cutting-edge AI platform provides a comprehensive, secure, and workflow-oriented solution that streamlines the entire contracting lifecycle—from identifying opportunities and capturing bids to executing proposals, winning contracts, and managing operations post-award.In 2025, GovDash played a pivotal role in helping clients win contracts worth over $5 billion. With $42 million in funding, we are poised to accelerate product development and expand our reach across the nation.About the RoleWe are seeking a passionate Software Engineer (Product) to enhance GovDash's core product offerings. This position is ideal for engineers who relish the challenge of working across the entire tech stack, taking ownership of product features from inception to deployment, and delivering high-quality software that our customers depend on daily.You will have the opportunity to engage with various product domains, developing reusable components, user-friendly interfaces, and robust backend services that support critical workflows for government contractors. Although our teams may specialize in different areas, this role emphasizes full-stack product development, a focus on customer impact, and adherence to strong engineering principles.This role offers a competitive base salary of $160,000 plus equity and is based in New York City.