Software Engineer, Payments Infrastructure

The role

You will build and own payments infrastructure across platform, product, and safety workstreams. This includes real-time card capture for voice, tokenization platforms, and egress control planes.

What you will do

• Build real-time card capture for voice by intercepting keypad and spoken digits in live audio streams
• Build and extend the tokenization platform
• Own the payments egress control plane
• Make payment actions correct using an at-most-once action primitive in the Agent SDK
• Keep card data out of unauthorized places using deterministic detection
• Make payments self-serve via APIs and gateway middleware
• Grow the platform by extending tokenization into a privacy vault for all PII

Required qualifications

• 5+ years building backend, platform, or infrastructure systems
• Track record of shipping and operating high-reliability services in production
• Deep security instinct regarding blast radius and least privilege
• Rigor about correctness under failure including retries and idempotency
• Fluency in a systems language such as Go
• Comfort owning critical systems from design through production and on-call
• Degree in Computer Science or a related field, or equivalent professional experience

Nice to have

• Real-time or streaming systems such as voice, telephony, media, or low-latency pipelines
• Applied cryptography and key management, network isolation, egress control, or cloud security
• Platforms such as APIs, SDKs, and self-serve developer services
• Deployments into customer-owned clouds or single-tenant environments
• Customer-facing technical work such as architecture reviews
• Setting technical direction on ambiguous, high-stakes problems
• Payments, fintech, or another sensitive-data domain such as healthcare or identity

Benefits

• Flexible (unlimited) paid time off
• Medical, dental, and vision benefits for you and your family
• Life insurance and disability benefits
• Retirement plan dependent on country of employment
• Parental leave
• Fertility and family building benefits
• Lunch, delicious snacks and coffee when working onsite
• Discretionary benefit stipend
• Free alphorn lessons
• Equity plans for eligible full-time employees

About the company

Sierra is a platform for customer-facing AI agents working with large brands. It is an in-person company based in San Francisco.