Senior Product Engineer, Scalability

Stack

Responsibilities

• ▹Architect and scale the pipelines that turn raw usage into accurate, real-time billing: metering, aggregation, rating and invoicing across millions of events, from ingestion in ClickHouse to the rating engine
• ▹Build payment flows that are correct under concurrency and partial failure: idempotent charges, retries, reconciliation and handling of provider edge cases (Stripe and beyond)
• ▹Develop fraud and abuse detection: signal collection, real-time scoring, automated mitigation
• ▹Scale the systems everything else depends on: Postgres under heavy write load, Node.js services under pressure, long-running workflows orchestrated with Temporal
• ▹Build TypeScript + GraphQL APIs where correctness and auditability are non-negotiable
• ▹Write Engineering Requirement Documents to take something from idea to defined tasks, implementation, monitoring and further scaling
• ▹Contribute to open-source repositories (CLI, TypeScript SDK, Railpack, etc.)
• ▹Be on call from time to time

Requirements

• ▹Ability to autonomously lead, design and implement backend systems where correctness, consistency and auditability are first-class requirements
• ▹Track record of scaling systems: taking a pipeline, service or database that was falling over and making it handle 10x
• ▹Deep expertise in Postgres and relational data modeling, including consistency guarantees and behavior at scale
• ▹Strong working knowledge of Node.js internals: the event loop, memory behavior and what to do when a service degrades under load
• ▹Experience managing complex asynchronous and long-running backend jobs, ideally with a workflow engine like Temporal, for things like billing runs or payment reconciliation
• ▹Familiarity with the realities of money movement: payment providers, idempotency, retries, reconciliation and failure modes
• ▹A security and abuse-aware mindset
• ▹Desire to be part of the entire project development process, from research and planning to implementation and monitoring
• ▹Great written and verbal communication skills for a mostly asynchronous environment

Nice to have

• ▹Direct billing, payments or fraud experience
• ▹Rust experience, or the desire to learn it

Soft skills

What we offer

• ▹Great salary
• ▹Full health benefits including dependents
• ▹Strong equity grants
• ▹Equipment stipend
• ▹Very few meetings: just Monday and Friday
• ▹High autonomy and ownership

About the company

Railway's core mission is to make software engineers higher leverage by giving them powerful tools so they spend less time setting up and more time doing. The platform now powers workloads for millions of builders. It is a startup with a globally distributed, small, high-ownership team.