Senior Full-Stack Engineer at Uncountable | San Francisco, New York, Munich, London

We appreciate your interest in joining Uncountable Engineering!About UsAt Uncountable, we are on a mission to transform industrial research and development. We are looking for passionate and innovative platform engineers who are eager to enhance user experience and scale web applications effectively. Join us in building a cutting-edge development platform that will empower Fortune 500 companies.Role OverviewAs a Senior Full-Stack Engineer, you will play a pivotal role in developing the Uncountable Web Platform, a tool where scientists can upload and analyze their experiments. This position will involve an equal blend of front-end and back-end work, allowing you to take full ownership of the platform's development. You will also have the opportunity to engage directly with customers and lead enterprise software deployments.

Thank you for exploring the opportunity to join Uncountable's dynamic Implementation team!About UsAt Uncountable, we recognize that the pace of scientific advancement is often hindered by inadequate tools. Our mission is to revolutionize this landscape. We have developed a comprehensive R&D platform that empowers leading chemists, material scientists, and biologists to significantly expedite the discovery, development, and market launch of innovative products.Founded by visionaries from MIT and Stanford, Uncountable is trusted by major R&D organizations in sectors such as chemicals, pharmaceuticals, advanced materials, and food & beverage. Our commitment is to enhance industrial R&D processes exponentially. We are a results-driven team that values speed and grants meaningful ownership from the outset.The RoleAs a Partner Implementation Manager at Uncountable, you will play a pivotal role in our partner ecosystem. The quality of partner-driven implementations is essential for our global expansion. Your expertise will ensure that every installation meets the stringent scientific standards, data integrity, and customer satisfaction that Uncountable is known for.This position closely aligns with our Scientific Implementation Manager role, but with the added responsibility of elevating the capabilities of our entire partner network. This includes being the go-to expert for complex configurations, developing training programs to empower partners, and maintaining the high standards that protect our reputation and client relationships.You will work collaboratively with both partner teams and end customers, requiring scientific acumen, platform proficiency, and exceptional communication skills. Additionally, you will take on a mentoring role, guiding partners to create systems that operate effectively even in your absence.Your ResponsibilitiesManage Partner-Led ImplementationsEnsure quality assurance across all partner-delivered implementations, serving as the final authority on compliance with Uncountable's standards prior to go-live.Stay actively engaged during partner implementations—reviewing data structures, participating in key customer milestones, and providing corrective guidance as needed.Maintain a comprehensive overview of implementation health across the partner network, proactively identifying risks and driving timely resolutions.

Thank you for your interest in joining the Uncountable Engineering team!Uncountable is on the lookout for enthusiastic recent graduates eager to embark on a data engineering career focused on managing customer datasets. Our mission is to transform the landscape of industrial research and development. We seek driven software engineers to develop tools that expedite the creation of new chemicals and materials.In this pivotal role, you will structure and ingest customer data into the Uncountable Web Platform, where scientists conduct and analyze their experiments. Your responsibilities will include (1) manipulating, transforming, and uploading R&D data using Python scripts, (2) establishing ETL pipelines between Uncountable and various data warehouses utilized by our customers, and (3) devising innovative solutions for users to import and export their data. This role requires a creative and analytical mindset, strong cross-functional communication skills, and the ability to sift through large datasets to identify necessary steps for data cleaning, processing, and uploading onto our platform.

About the RoleWe are seeking a motivated and enthusiastic Junior Account Executive to join our dynamic sales and business development team at Uncountable. With an ever-growing number of startups emerging, this is an exciting opportunity to engage with a large pool of potential customers. You will play a key role in managing inbound interest and strategically pursuing warm leads. This position offers the chance to collaborate across various teams and significantly contribute to both our product development and team dynamics.Key ResponsibilitiesDevelop and maintain effective outbound campaigns through various channels including email, phone, and LinkedIn.Present compelling sales pitches to prospective clients both virtually and in person.Conduct engaging demonstrations of Uncountable's web platform.Create comprehensive proposals and manage negotiations with clients.Coordinate sales initiatives to ensure Uncountable consistently showcases its best offerings.RequirementsPrevious professional experience in software or a related sales role.A strong individual contributor who excels in collaboration.Exceptional communication and interpersonal skills.A positive attitude with a willingness to learn and engage proactively.Availability to travel approximately 15% of the time.Flexibility to take morning calls with clients on the East Coast and in Europe.Preferred QualificationsExperience in an early-stage startup environment.Background in selling technical products.Familiarity with enterprise sales techniques.Knowledge in chemistry, materials science, or statistics.A passion for technology, chemistry, or material science.Salary: $70,000 - $90,000 Base, $140,000 - $200,000 OTE + Equity

We appreciate your interest in joining the Uncountable Engineering team!About the RoleAt Uncountable, we are on a mission to revolutionize R&D by creating an AI-first ecosystem. Our cutting-edge tools are designed to empower scientists at Fortune 500 companies to enhance their discovery processes utilizing Generative AI.As an LLM Applications Engineer, you will play a pivotal role in shaping our LLM infrastructure. You will not only build user interfaces but also architect retrieval systems, agentic workflows, and data pipelines that connect intricate experimental data with actionable AI insights, significantly modernizing the data interaction for top-tier researchers.

We appreciate your interest in joining the Uncountable Engineering team!About UsAt Uncountable, we are on a mission to transform the landscape of industrial research and development through innovative web applications. We are looking for talented and enthusiastic Full-Stack Engineers who are passionate about creating exceptional user experiences and scalable platforms for Fortune 500 companies.Role OverviewIn this pivotal role, you will be responsible for enhancing the Uncountable Web Platform, where scientists can upload and analyze their experimental data. This position will involve an equal focus on both front-end and back-end development, allowing you to leverage your full-stack expertise.Salary Range: $120K - $160K + EquityQualificationsA minimum of 2 years of professional development experienceStrong enthusiasm for designing data analysis-driven user interfaces and experiencesProficient in modern JavaScript best practicesSolid understanding of computer science fundamentals and software engineering principlesPreferred QualificationsBachelor's Degree in Computer Science or a related fieldFamiliarity with React and ES6Experience with SQL databases, including query performance optimizationOur Technology StackBackend: Flask (Python), PostgreSQLFrontend: React (TypeScript), Redux, SassBenefitsCompetitive Salary and EquityHealth and Dental Insurance401K with Employer ContributionWhat’s next? Learn more about interviewing at Uncountable.

About StackAIStackAI is a revolutionary no-code AI workflow platform that enables businesses to construct, implement, and expand AI-driven workflows without requiring extensive machine learning expertise. With a growing user base and increasing enterprise adoption, our goal is to democratize access to large language models (LLMs), empowering every business operator—beyond just developers. Supported by Y Combinator and top-tier investors, we are laying the groundwork for the AI-driven future of work.The RoleAs a Senior Full Stack Engineer, you will be instrumental in defining the product and technical architecture at StackAI. Your responsibilities will span the entire technology stack, from crafting scalable backend systems to creating stunning and user-friendly frontend interfaces, and incorporating advanced AI models into our platform. This role offers significant impact, as you will work closely with the founding team, take charge of essential product features, and shape the engineering culture of a rapidly evolving startup.We seek exceptional 10X engineers—innovative builders who can consistently deliver results in a dynamic environment, remain inquisitive, and excel in diverse roles.ResponsibilitiesIn this role, you will:Build and own the entire platform, from backend services and APIs to frontend interfaces.Create robust, scalable backend systems utilizing Python and FastAPI (or similar), with optimized databases (SQL/NoSQL).Design and maintain high-quality user interfaces using React, Next.js, TypeScript, and Tailwind CSS, ensuring polished, intuitive, and responsive user experiences.Integrate new AI models and features into our products for seamless performance and enhanced value.Manage StackAI’s landing and product pages to establish benchmarks for clarity, design, and quality.Collaborate across the stack to connect backend services with frontend applications seamlessly.Engage with design, product, and customers to refine product direction and prioritize user needs.Stay at the forefront of full-stack technologies, promoting best practices and innovative solutions.Assist with customer support as needed; every team member contributes to user satisfaction.

Join Our Team!At Uncountable, we are seeking a dynamic and driven individual to become part of our sales and business development team. As the startup ecosystem continues to expand, we need an enthusiastic Junior Account Executive to manage the increasing inbound interest from potential clients and actively pursue promising opportunities. This role offers a unique chance to collaborate across teams and have a significant impact on our product and company culture.Key Responsibilities- Develop and manage outbound campaigns using various channels such as email, phone, and LinkedIn.- Present compelling sales pitches to potential clients, both virtually and in-person.- Conduct product demonstrations showcasing Uncountable's innovative web platform.- Prepare proposals and negotiate terms effectively.- Coordinate sales initiatives to ensure Uncountable consistently excels in client engagements.Requirements- Proven experience in software sales or related fields.- Strong self-starter with the ability to collaborate effectively within a team.- Exceptional communication and interpersonal skills.- A positive attitude and eagerness to learn; a proactive individual ready to dive into challenges.- Willingness to travel approximately 15% of the time.- Availability for morning calls with East Coast and European clients.Preferred Qualifications- Experience in a startup environment.- Previous experience selling technical products.- Familiarity with enterprise sales strategies.- Background in chemistry, materials science, or statistics is a plus.- A passion for technology, chemistry, or material science is highly valued.

About Chalk Inc.Chalk Inc. is at the forefront of revolutionizing machine learning applications through our cutting-edge data platform. We dismantle traditional barriers of complexity, latency, and scalability that have historically hindered ML capabilities. Our platform pairs the speed of Rust with user-friendly tools that developers adore. Trusted by leading companies, Chalk is instrumental in initiatives ranging from preventing fraudulent credit card transactions to optimizing clean energy usage. Recently, we secured a $50 million Series A funding led by Felicis.About the RoleWe are actively seeking skilled Software Engineers to join our dynamic team. This is a unique opportunity to become an early employee and significantly contribute to our rapidly growing startup. You will engage with challenging engineering problems while enjoying a high level of autonomy and ownership.Work EnvironmentOur team is in the office five days a week, and while we are flexible with unavoidable conflicts, this is not a hybrid role.Who We Are Looking ForWe seek software engineers who excel in tackling business challenges across all layers of the software stack. At Chalk, we create reliable data processing systems that perform exceptionally at scale, with a keen focus on enhancing developer experience.The ideal candidates will possess the ability to craft world-class user experiences across CLI and web interfaces while contributing to a codebase that integrates concepts from compilers, query planners, and distributed systems.What You Will DoCollaborate directly with Chalk’s co-founders to launch our first iteration.Develop using TypeScript, Python, Go, and React.Facilitate data scientists and machine learning end-users in utilizing our core platform functionalities in their preferred environments.Rapidly iterate to enhance Chalk’s platform in response to user feedback.

Join our dynamic team at gumloop as a Senior Full Stack Engineer, where you will play a pivotal role in shaping our technology landscape.Take ownership of end-to-end feature development: design, implement, test, deploy, and maintain your creations in production.Collaborate closely with users to swiftly transform feedback into actionable improvements, achieving results within hours, not days.Develop and manage scalable front-end and back-end solutions that maintain speed and reliability as user traffic increases.Contribute to the growth of the team by reviewing pull requests, providing context, and mentoring junior engineers.

At CreatorIQ, we are dedicated to revolutionizing creator-led growth, empowering over 1,300 global brands and agencies to thrive.Our mission is to humanize businesses while amplifying the impact of individuals. Guided by our core values—intentionality, excellence, collective journey, and humanity—we have been recognized as one of the best workplaces by various programs, including BuiltIn LA and NY. Our growth story includes being named one of the Fastest-Growing Companies in North America by Deloitte Technology Fast 500™ for four consecutive years, and being highlighted as a leader in IDC MarketScape: Worldwide Influencer Marketing Platforms for Large Enterprises in 2025, among others. Our flexible work model fosters collaboration and innovation, accommodating diverse working styles.Join us in our exciting journey. Become a vital part of our dynamic team and help transform the industry!Senior Full Stack Engineer, Creator RecruitWe are looking for a talented Senior Full Stack Engineer to enhance our Creator Tools team. Your contributions will significantly improve user experiences and help us develop scalable solutions for our expanding platform.The ideal candidate will possess a strong background in frontend frameworks, solid backend development skills, and a collaborative spirit suited for a fast-paced environment. You should be ready to take ownership of features, contribute to architectural decisions, and maintain high coding standards.The Creator Tools team is responsible for developing all user-facing features on our platform, directly impacting the lives and livelihoods of creators who utilize our tools to earn and sustain their businesses.From payment processing and social authentication to e-commerce solutions and campaign workflows, we enable the full creator experience. Every feature you develop and enhancement you implement is integral to delivering a seamless, intuitive platform that empowers creators to grow and earn with confidence.This role allows you to make an immediate and meaningful difference in the lives of creators who rely on our platform to pursue their passions.

Join Plaud as a Senior Full Stack Engineer and contribute to innovative software solutions that make a difference. This role offers the opportunity to work in a dynamic environment where you will collaborate with cross-functional teams to design, develop, and implement web applications.

Become a Catalyst in the Sleep Fitness RevolutionAt Eight Sleep, we are dedicated to unlocking human potential through exceptional sleep. As pioneers in the sleep fitness industry, we are reshaping the concept of restful sleep by developing state-of-the-art hardware, software, and AI technologies that facilitate this transformation. Our innovative products enhance mental, physical, and emotional performance, converting each night’s rest into a personalized, data-driven recovery journey.We have earned the trust of high achievers, professional athletes, and health-focused individuals across over 30 countries. Celebrated as one of Fast Company's Most Innovative Companies in 2019, 2022, and 2023, and recognized by TIME's “Best Inventions of the Year” on two occasions, we pride ourselves on operating as a high-performance team: swift, focused, and driven by impactful outcomes. We don’t merely deliver; we continuously enhance and obsess over the details that empower our members to sleep better and awaken stronger.Every position at Eight Sleep presents an opportunity to engineer groundbreaking technology, collaborate with elite talent, and contribute to a future where sleep is not just a passive experience, but a formidable tool for improved living. If you are seeking to break free from the mundane and are passionate about pushing the boundaries of what's possible, seize this moment. Join us as we lead the transformation of how the world sleeps and the potential we can unlock upon waking.Uncompromising Standards. Relentless PursuitWe operate with unmatched intensity, driven by the demands of our mission. At Eight Sleep, we embody the focus and relentless spirit of the world’s top performers: always striving to be in the top 1% of our craft. Inspired by Kobe Bryant’s mamba mentality, we apply this mindset to bold concepts, next-gen technologies, and impeccable execution. This isn’t a standard 9-to-5; our team commits to extra effort, not out of obligation, but from a genuine concern for the impact of our work. We are here to innovate rapidly, challenge limits, and deliver without compromise. If you excel under pressure and desire to engage in the most significant work of your career, you’ll find your place with us. If you seek something easier, this may not be the right fit.The RoleWe are in search of a Full Stack Engineer to serve as the technical cornerstone of our Customer Experience (CX) transformation. In this role, you will develop tools, integrations, and monitoring systems that enable our AI agents and human support teams to resolve customer issues with increased speed and efficiency. This is a unique opportunity to work at the convergence of AI, customer experience, and software engineering, creating solutions that tangibly impact hundreds of thousands of customers.

We appreciate your interest in joining the Uncountable Engineering team!Position OverviewUncountable is on the lookout for enthusiastic interns who are eager to embark on a journey in full-stack software engineering. Our mission is to transform the landscape of industrial research and development. We seek passionate engineers ready to contribute to the creation of an advanced development platform utilized by Fortune 500 companies.Potential ProjectsYou'll have the opportunity to design databases for enhanced analytical capabilities and develop innovative interfaces and views that empower scientists in managing experiments.EligibilityWe will only consider candidates who are graduating within a year of the internship.Compensation: $6,000 per month

ABOUT SPHERESphere is revolutionizing trade compliance with cutting-edge AI technology. Our innovative system, TRAM, autonomously analyzes and interprets global trade laws, ensuring reliable compliance determinations across various jurisdictions. We manage the full compliance lifecycle—from calculation and registration to filing and remittance—with millisecond latency and zero downtime.At Sphere, we are proud to be backed by prominent investors such as a16z and Y Combinator, and we've achieved over 30% month-over-month growth. Our impressive client roster includes emerging leaders like ElevenLabs, Replit, Deel, and Runway. We operate with a small, dedicated team in our San Francisco headquarters, where every member has ownership over significant domains of our platform.THE ROLEWe are seeking experienced Senior Full Stack Engineers to spearhead the development of new product lines, including input tax, withholding tax, e-invoicing, and tariffs. Your contributions will be pivotal in scaling our operations and directly influencing our annual recurring revenue (ARR).WHAT YOU'LL DOWithin weeks:Deliver critical features that clients rely on daily, such as filing infrastructure.Take ownership of a feature and drive measurable outcomes.Collaborate with customers like Eleven Labs, Lovable, and Deel to enhance key components of our platform, aiming to improve filing generation and submission speeds.Within months:Lead the end-to-end development of new product lines, furthering our AI-driven compliance platform.Mentor junior engineers and foster a collaborative team environment.

Join Binti as a Senior Full Stack Software Engineer and play a crucial role in developing innovative software solutions that enhance our mission to streamline the adoption process. You will be responsible for designing, developing, and maintaining our web applications, ensuring optimal performance and user experience.In this position, you will collaborate with cross-functional teams, participate in all phases of the software development lifecycle, and mentor junior developers. If you are passionate about building scalable applications and are eager to solve complex problems, we want to hear from you!

About UsScribe is a dynamic workplace where talented individuals achieve their career best. Our Workflow AI platform is trusted by over 94% of the Fortune 500, enabling teams to enhance their workflows and boost efficiency. Since our inception in 2019, we've expanded to over 5 million users across 600,000 businesses. Based in San Francisco, we've earned recognition as a LinkedIn Top Startup and are valued at over $1 billion, supported by prominent investors. Join us in revolutionizing the way work is done.Our Work CultureAt Scribe, we are passionate builders dedicated to mastering our crafts while supporting each other in achieving shared success. Our core values include:Accelerating impactRaising the barEmpowering our usersPracticing kindness through clarityEmbracing rapid learningFostering teamworkRole OverviewWe are seeking an experienced Senior Full Stack Engineer who thrives on developing application code and scalable distributed systems. Your expertise will contribute to designing extensive data ingestion and processing systems, integrated with our custom AI models.

ABOUT MITHRLWe envision a future where new medicines are accessible to patients within months rather than years, and where scientific innovations occur at lightning speed.Mithrl is pioneering the first commercially available AI Co-Scientist, a revolutionary discovery engine that transforms complex biological data into actionable insights in mere minutes. By utilizing natural language queries, scientists can receive real analysis, innovative targets, hypotheses, and patent-ready reports instantly.Our impressive growth trajectory:12X year-over-year revenue expansionTrusted by top-tier biotechs and major pharmaceutical companies across three continentsFacilitating tangible breakthroughs from target discovery to real patient outcomes.ABOUT THE ROLEWe are seeking a Senior Full Stack Engineer to architect, scale, and enhance the core Mithrl product. This pivotal role demands a product-centric mindset, granting you substantial ownership across frontend, backend, and system architecture. You will collaborate with product, design, machine learning, and scientific teams to translate intricate scientific workflows into user-friendly, high-performance software utilized by leading researchers daily.As a senior engineer, your responsibilities will extend beyond just execution; you will also shape technical direction, architectural choices, and establish engineering standards. You will oversee features from initial concept through to production, iteration, and scaling. This position requires robust full-stack engineering principles, a passion for shipping products, and the ability to thrive in dynamic, fast-paced environments.If you have a passion for creating impactful products for sophisticated users, delving deep into system design and user experience, and taking ownership of essential components in a rapidly expanding platform, this opportunity is perfect for you.

About StradaStrada is at the forefront of revolutionizing the insurance industry by creating an AI-driven operating layer. Our innovative platform utilizes advanced AI agents to streamline communication across calls, texts, emails, and chat, effectively managing essential front-office tasks from policy servicing to claims intake.With a dedicated focus on the insurance sector, Strada provides unparalleled domain expertise and a product depth that generic AI solutions simply cannot offer. Supported by Y Combinator and elite investors, we currently facilitate over 1 million customer interactions for leading insurers, MGAs, and brokers, representing more than $10 billion in annual premiums. Our rapid adoption across the industry underscores the demand for our transformative solutions.The insurance sector, one of the largest and most intricate global industries, stands on the brink of a significant transformation. Strada is set to replace outdated workflows with AI-native infrastructure that operates efficiently at scale, bridging the gap between AI, infrastructure, and the stringent regulations governing real-world systems.As a compact, high-ownership team located in San Francisco, we are already integrated into production systems at sophisticated insurance organizations. If you're eager to innovate, tackle complex challenges, and influence the future of a major industry, we would love to connect.Why Insurance?The insurance industry is a vital component of the global economy, aiding businesses in maintaining operations, helping families recover from unexpected events, and enabling entire industries to manage risk. However, its operational methods have remained largely unchanged for decades, with many frontline processes still relying on traditional phone calls and legacy systems.At Strada, we are developing AI solutions that seamlessly integrate into these processes, making them significantly faster, smarter, and more efficient. This represents a market exceeding $300 billion, ripe for innovation.The OpportunityWe are seeking a Senior Full Stack Engineer to join our team in San Francisco. In this role, you will be at the cutting edge of voice AI technology, responsible for developing, evaluating, and deploying advanced LLM and voice systems that redefine conversational AI.As a senior full stack engineer, you will take ownership of significant projects and collaborate closely with clients to create products that exceed their expectations. This role is pivotal for someone passionate about shaping both our product offerings and engineering culture as we expand.

Agency Notice: We are not currently collaborating with recruiting agencies for this position. Please refrain from contacting Vizcom employees regarding this role. Any resumes submitted without a prior agreement will be deemed unsolicited.Why Join Vizcom?Vizcom is an innovative AI-driven design platform utilized by industry leaders such as GM, Nike, and Ford, among over 200 other esteemed companies, to transform sketches into stunning photorealistic renders, 3D models, and engaging videos. Our belief is that AI should enhance human creativity rather than replace it. By adopting a sketch-first methodology, we empower designers to maintain control while significantly speeding up the iteration process from 5 ideas to 500 in a single session. Our team of around 50 is rapidly expanding, delivering multiple updates daily, and developing the tool that is setting the benchmark for professional industrial design.Your RoleIn this role, you will engage with the entirety of Vizcom's technology stack, from TypeScript-based design tools to Postgres data models and AI inference pipelines, to deliver fully integrated features that designers rely on daily. While our frontend and backend specialists dive deep into their focuses, your expertise spans wide: you will be the engineer capable of tracing a bug from a React component through a GraphQL query to a Postgres function, resolving it, and deploying the fix before lunch.This position is perfect for individuals who thrive on variety and ownership. In any given week, you may create a new canvas interaction in React Flow, refine a PostGraphile query, implement a BullMQ job for a new AI workflow, and review a fellow team member's migration. Your contributions will make the philosophy of enhancing human creativity with AI a reality across our entire product.Compensation$195K – $225K + Offers EquityKey ResponsibilitiesDeliver complete features: Take ownership of features from React component to Postgres schema — with no handoffs or delays.Enhance product UI: Create fast and precise interactions in React, TypeScript, and React Flow.Develop APIs and data models: Execute Postgres migrations, PostGraphile mutations, and RLS policies for multi-tenant isolation.Integrate AI workflows: Seamlessly connect frontend experiences to GPU inference pipelines through BullMQ and external AI services.Optimize the tech stack: Profile and enhance performance across the board — from React renders to GraphQL resolutions and query plans.Collaborate extensively: Partner with frontend specialists, graphics engineers, designers, and product teams to deliver cohesive user experiences.Enhance reliability: Implement monitoring for features to ensure robust performance.