Note: The job is a remote job and is open to candidates in USA. Basis Theory is seeking a Senior Product Engineer to build and operate infrastructure for tokenizing, storing, and moving sensitive data in payment and compliance-focused environments. The role owns platform components end-to-end, designs and ships APIs and product features, drives technical decisions, improves reliability, and collaborates with engineers, customers, sales, and support.
Responsibilities
- Design, build, and ship product features across our tokenization platform, payment orchestration layer, and multi-tenant API infrastructure
- Drive technical design decisions for complex systems — balancing performance, compliance constraints, and customer needs with minimal guidance
- Lead delivery of cross-cutting features end-to-end: from technical design through production rollout, proactively resolving roadblocks
- Own the reliability and evolution of platform components, continuously identifying risks and shipping improvements
- Build APIs that are consumed by both developers and AI agents — designing for clarity, consistency, and machine-readability
- Leverage AI coding tools to accelerate development workflows, improve code quality, and push the boundaries of what a small team can ship
- Collaborate with other engineers through pairing, design reviews, and technical guidance — raising the bar across the team
- Partner with customers, sales, and support to understand real-world usage and deliver solutions that solve actual problems
Skills
- • You have deep backend expertise (C#, Java, or similar) and the aptitude to become proficient in our other core languages (Go, JavaScript, Swift)
- • You care about the details: performance, API ergonomics, and the quality of the developer experience you're shipping
- • You have a high bar for code quality and test automation — you don't ship without confidence
- • You leverage tools like Claude, GPT, or similar to accelerate your engineering work and are curious about how AI changes what's possible in product development
- • You thrive in a collaborative, low-ceremony environment where engineers own outcomes, not just tasks
- • You have a proactive, problem-solving mindset — you find issues before they find customers
- • You're a lifelong learner who's energized by working at the intersection of payments, security, and developer tools
- • Backend engineering experience building API-based systems
- • Deep problem-solving skills that enable full-stack contribution
- • Test automation experience with a high quality bar
- • Experience designing and/or publishing REST APIs
- • Proficiency developing APIs with C#, Java, or comparable language
- • Experience using AI coding assistants and LLM-based tools to accelerate engineering workflows
- • 5+ years of experience in software development, building and operating API-based systems
- • High-velocity transactional systems (hundreds of millions of API calls per week)
- • Payment engineering in a PCI Level 1 environment
- • Building multi-tenant platforms where isolation and compliance are non-negotiable
- • Load testing and performance engineering at scale
- • Designing APIs consumed by LLM agents or AI-native applications
- • CI/CD or DevOps experience (GitHub Actions, Azure DevOps, etc.)
- • Experience with AWS cloud services
- • Experience with systems operating at high-velocity API throughput (>30m requests per week)
- • Experience building features that integrate AI/LLM capabilities or serve AI-native use cases
Company Overview