Full Stack Engineer at Unit21 in San Francisco, California, United States
- Company: Unit21
- Location: San Francisco, California, United States
- Posted: Sep 24, 2026
- Type: Full-time
- Salary: $160,000 - $200,000 annually
- Experience: 3+ years
Overview
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.
Job description
- 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.
Responsibilities
- Design and build high-performance automation and AI systems with intuitive user interfaces prioritizing scalability, reliability, and efficiency.
- Lead projects from start to completion
- Collaborate with product and design to refine user experiences
- Reviewing pull requests, internal and external to team
- Innovating on creative solutions to difficult problems
- Work with related data infrastructure technologies
- Building new features to help our customer detect ever changing complex fraud scheme
- Developing and deploying efficient and elegant code
Requirements
- 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 UI
- Experience in building and managing distributed systems.
- Experience with AWS and Terraform
- Experience 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, humility
- Experience managing large-scale critical production systems with minimum SLAs of 4 9's
- Experience with Databricks or Apache Spark
- Experience with building and deploying RAG pipelines
- Experience with securing MCP
Skills
Required
- Python/Go/Rust
- React
- Material UI
- AWS
- Terraform
- SQL
- Distributed systems
- API development
- Software engineering principles
Preferred
- Databricks
- Apache Spark
- RAG pipelines
- MCP
- Large-scale production systems
Benefits
- Competitive salary and pre-IPO equity
- 100% company-paid medical, dental, and vision insurance (employee)
- Unlimited PTO and generous leave programs
- 401(k), learning & development stipend, and home office setup support
- Inclusive, high-ownership culture focused on impact, innovation, and growth
- The standard base pay range for this role is $160,000 - $200,000 annually. This range does not include bonuses, equity, or other incentives.
About Unit21
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.