Senior Fullstack Engineer (Payments)

Senior Fullstack Engineer (Payments)

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.

Key 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.

Required Qualifications & Key Competencies

• 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.

Company Culture & Perks

• Topstep is an engaging working environment that ranges from fully remote to hybrid. We foster a culture of collaboration by keeping cameras on during meetings and maintaining a robust Slack environment for communication.
• 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.

New Hire Base Salary Range

• $157,000 - $193,000 annually.
• Bonus: This position is eligible for a performance-based bonus as provided by the plan terms and governing documents.
• The compensation offered will take into account the internal compensation structure and may vary depending on the candidate's geographic region, job-related knowledge, skills, and experience, among other factors.

Equal Opportunity Employer

Topstep is an Equal Opportunity Employer. We are committed to fostering an inclusive environment where all employees and applicants are valued. All qualified candidates will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, age, disability, or veteran status, in compliance with applicable federal, state, and local laws.

Interested in the role? Apply today with your resume!