Senior Product Engineer — Payments APIs & Tokenization

Kindredventures; United States; On-site; USD 140,000 - 190,000; Full time

Job summary

Basis Theory seeks a Senior Product Engineer to build tokenization, payments orchestration, and multi-tenant API infrastructure at scale. You will own critical platform components end-to-end, from API design through production operations, leveraging AI tooling to accelerate delivery.

You will collaborate with engineers and cross-functional teams to deliver reliable, high-quality APIs and systems that serve AI-native customers and traditional integrations.

Qualifications

• Backend API-based systems development experience.
• Strong problem-solving enabling full-stack contribution.
• Test automation 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.

Responsibilities

• Design, build, and ship features across the tokenization platform, payment orchestration layer, and multi-tenant API infrastructure.
• Drive technical design decisions for complex systems balancing performance, compliance, and customer needs with minimal guidance.
• Lead delivery of cross-cutting features from design through production rollout and resolve roadblocks.
• Own the reliability and evolution of platform components, shipping improvements.
• Build APIs consumed by developers and AI agents with clear, consistent interfaces.
• Leverage AI coding tools to accelerate development and improve code quality.
• Collaborate with engineers through pairing, reviews, and guidance to raise team standards.
• Partner with customers, sales, and support to address real-world usage.

Skills

Backend API development

Full-stack mindset

Test automation

REST API design

C# / Java proficiency

AI tooling familiarity

Tools

AWS

GitHub Actions

Azure DevOps

Job description

Basis Theory seeks a Senior Product Engineer to build tokenization, payments orchestration, and multi-tenant API infrastructure at scale. You will own critical platform components end-to-end, from API design through production operations, leveraging AI tooling to accelerate delivery.

You will collaborate with engineers and cross-functional teams to deliver reliable, high-quality APIs and systems that serve AI-native customers and traditional integrations.