Full Stack Engineer

About Us​For many people, the most important aspect of a new role is mission alignment. At Unit21, we’re dedicated to fighting financial crime. We’re building out a suite of AI tooling to make detection & investigation so efficient that many vectors of wrongdoing will be eliminated. Our calling card in the industry is customizability and putting control in the hands of Fraud & AML agents to help them work with speed, accuracy, and trust. Unit21 is a place to work for those who want to make a difference.​Job DescriptionAbout the role:We are looking for a full stack engineer who is passionate about catching fraud. We build AI products that help our customers detect fraud and keep their customers money safe. This requires careful thought, high creativity, and a deep understanding of complex systems.What you will be doing:Design and build high-performance automation and AI systems with intuitive user interfaces prioritizing scalability, reliability, and efficiency.Lead projects from start to completionCollaborate with product and design to refine user experiencesReviewing pull requests, internal and external to teamInnovating on creative solutions to difficult problemsWork with related data infrastructure technologiesBuilding new features to help our customer detect ever changing complex fraud schemeDeveloping and deploying efficient and elegant codeWhat we’re looking for:BS, MS or Ph.D in Computer Science, Engineering, Mathematics, Statistics, Physics, or related field is required.3+ years of experience in Python/Go/Rust.3+ years of experience with React and Material UIExperience in building and managing distributed systems.Experience with AWS and TerraformExperience in developing and optimizing end-to-end APIs, data-flows, SQL queries and infrastructure for consumer or enterprise products.Advanced knowledge of software engineering principles including software design, source control management, build processes, automated deployments, code reviews, testing methods.Hustle, curiosity, humilityBonus Points!Experience managing large-scale critical production systems with minimum SLAs of 4 9'sExperience with Databricks or Apache SparkExperience with building and deploying RAG pipelinesExperience with securing MCPWork Location:San Francisco - Bay AreaCompensation:The standard base pay range for this role is $160,000 - $200,000 annually. This range does not include bonuses, equity, or other incentives.What We OfferCompetitive salary and pre-IPO equity100% company-paid medical, dental, and vision insurance (employee)Unlimited PTO and generous leave programs401(k), learning & development stipend, and home office setup supportInclusive, high-ownership culture focused on impact, innovation, and growthEqual OpportunityUnit21 is an equal opportunity employer. We encourage candidates to apply even if they do not meet every listed requirement. We are committed to building a diverse, inclusive workforce.Job InformationDate Opened 09/24/2026 Job Type Full time Industry Technology City San Francisco State/Province California Country United States Zip/Postal Code 94102