Senior Fullstack Engineer (Payments)

Topstep

2d • Hybrid

About The Position

As a Senior Full Stack Engineer at Topstep, you’ll play a key role in building the distributed systems that power our trader experience. You’ll help define and evolve the architecture that serves as the backbone of our payments and purchasing platform, ensuring reliability, scalability, and clarity as our ecosystem grows.
You’ll work primarily in TypeScript and React, building cloud-native applications that support high-throughput, low-latency workloads. In addition to shipping features, you’ll influence coding standards and engineering patterns adopted across teams, and help ensure the platform scales safely as usage and complexity increase.
This role is ideal for someone who wants to contribute to key systems in our ecosystem, delivering elegant solutions that scale with intention. Join us and help shape what engineering excellence looks like at Topstep.

Requirements

• 5+ years of experience building and operating production-grade systems with user-facing APIs, with demonstrated impact on scalability and reliability.
• A solid full-stack foundation, with strength in backend API design (TypeScript, GraphQL, REST) and modern frontend development (React, Next.js, TypeScript).
• Deep expertise in designing and operating scalable, distributed systems, including event-driven architectures, message queues, eventual consistency, and race condition handling, with a strong focus on performance, security, and maintainability.
• Strong database fundamentals, including experience with PostgreSQL or SQL Server—schema design, migrations, indexing, and query optimization.
• Excellent communication skills, with the ability to distill complex technical concepts for a range of audiences.
• A production mindset and bias toward action—embracing metrics, logging, tracing, on-call participation, and end-to-end ownership of delivery.

Responsibilities

• Design, build, and operate cloud-native applications with an emphasis on reliability, safe deployments, and operational simplicity.
• Embed automated testing, observability, and operational ownership into every stage of feature delivery.
• Proactively identify and resolve issues, helping ensure our platform remains stable, performant, and ready to grow.
• Collaborate with product engineering teams to champion event-driven best practices and deliver scalable, resilient solutions.

Benefits

• 7 Company-paid Holidays and generous Family Leave.
• Paid time off is front-loaded.
• Competitive 401(k) matching, health, dental, and vision insurance are offered for full-time employees.
• Vacations are encouraged with a bonus for taking 5 consecutive days.
• Topstep offers a food and groceries budget and contributes towards health and wellness.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 501-1,000 employees