Performance Engineering Lead at TD Bank focusing on testing mission - critical software in an agile environment. Enhance performance testing practices and mentor junior engineers.
About the role
- Senior Product Engineer designing scalable backend systems for Railway's platform. Architecting and implementing solutions for billing, payment, and fraud detection services.
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 clean handling of provider edge cases (Stripe and beyond).
- Develop fraud and abuse detection — signal collection, real-time scoring, automated mitigation — that protects platform margin without getting in legitimate users' way.
- Scale the systems everything else depends on: Postgres under heavy write load, Node.js services under pressure, and long-running workflows orchestrated with Temporal where exactly-once semantics and durability actually matter.
- Build TypeScript + GraphQL APIs where correctness and auditability are non-negotiable.
- Write Engineering Requirement Documents to take something from idea, to defined tasks, to implementation, to monitoring its success and scaling it further.
- Contribute to our open-source repositories (CLI, Typescript SDK, Railpack, etc.) — Rust experience, or the desire to learn it, helps here.
- Be oncall from time to time.
Requirements
- An ability to autonomously lead, design, and implement backend systems where correctness, consistency, and auditability are first-class requirements.
- A track record of scaling systems — you've taken a pipeline, service, or database that was falling over and made it handle 10x, and you know which tools to reach for (and when polling stops being enough).
- Deep expertise in Postgres and relational data modeling — you reach for the right consistency guarantees, understand the cost of getting them wrong, and know how Postgres itself behaves 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 their failure modes. Direct billing, payments, or fraud experience is a strong plus.
- A security and abuse-aware mindset — you instinctively think about how a system can be gamed, and you design accordingly.
- A desire to be a part of the entire project development process, from research gathering and planning, to implementation and monitoring.
- Great written and verbal communication skills for expressing ideas, designs, and potential solutions in a mostly-asynchronous manner.
Benefits
- Great salary
- Full health benefits including dependents
- Strong equity grants
- Equipment stipend
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