Senior Software Engineer - Trader Experience

Summary

Are you a full-stack engineer who thrives on designing scalable solutions, shipping multi-tenant platforms, and raising the technical bar for teams around you? As a Staff Full Stack Engineer on the Trading Experience team at Topstep, you'll play a foundational role in shaping our white-label trading platform—from C# microservices running on Kubernetes to the React-based experiences that partners customize for their traders. You'll be instrumental in our architectural modernization, establishing patterns that enable teams to move fast with confidence while maintaining the reliability and flexibility that our partners demand.

This role is ideal for someone who brings both deep technical expertise in .NET and cloud-native architectures alongside a product mindset. Someone who's excited to own features end-to-end, design for multi-tenancy and partner customization, establish reusable patterns that scale across teams, and mentor engineers who are building the next generation of our platform. Join us and help define what technical excellence looks like at Topstep.

Key Responsibilities

• Set technical direction for full-stack architecture across Trading Experience, influencing how we design microservices, structure frontends, and ensure system reliability for multi-tenant environments
• Own end-to-end feature development from C# microservices and database design through React/Next.js UI, ensuring seamless integration and optimal performance across the stack
• Establish engineering patterns for .NET Core service design, API contracts, React component architecture, and multi-tenant data isolation that other teams can adopt
• Partner with product and design to translate partner and trader needs into technical solutions that balance customization requirements with maintainable architecture
• Drive architectural improvements during our modernization initiative, building cloud-native microservices on Kubernetes while maintaining feature velocity and partner commitments
• Lead technical initiatives that materially improve developer experience, system performance, deployment reliability, or code quality across the organization
• Mentor engineers across teams on full-stack best practices, microservices architecture, Kubernetes operations, and production ownership
• Champion quality and reliability by embedding testing, monitoring, and operational thinking into every feature you ship

Required Qualifications and Key Competencies

• 7+ years of professional experience building production web applications, with demonstrated impact establishing patterns and practices that scaled across multiple teams
• Strong full-stack foundation with expertise in both backend microservices (C#/.NET Core, ASP.NET Core) and modern frontend development (React, Next.js, TypeScript)
• Deep .NET Core expertise including ASP.NET Core Web APIs, dependency injection, middleware pipelines, async/await patterns, and building maintainable service architectures
• Production Kubernetes experience running microservices on EKS, writing Helm charts, managing deployments with ArgoCD or similar GitOps tooling, and understanding pod lifecycle, networking, and storage
• Database and persistence knowledge including SQL Server, PostgreSQL, Entity Framework Core, schema design for multi-tenancy, and distributed data patterns
• Modern frontend mastery with Next.js, React, TypeScript, and CSS frameworks (Tailwind, styled-components), including Server Components, state management, and performance optimization
• Microservices architecture experience including service boundaries, API versioning, event-driven patterns, distributed tracing, and handling eventual consistency
• Production ownership mindset with experience building observable, testable, and maintainable systems including instrumentation, structured logging, and debugging distributed issues
• Track record of technical leadership through design documents, architectural decision records, code reviews, and establishing engineering standards
• Excellent communication skills with the ability to explain complex technical trade-offs to varied audiences and build consensus across teams
• Comfortable making pragmatic decisions balancing long-term architectural vision with immediate business needs and partner commitments

Preferred Qualifications

• Experience building multi-tenant SaaS platforms or white-label products with tenant isolation, customization, and data partitioning patterns
• Background with message brokers (NATS, RabbitMQ) and event-driven architectures
• Experience with CI/CD pipelines, GitHub Actions, and automated deployment strategies (blue-green, canary)
• Familiarity with service mesh technologies (Istio, Linkerd) or API gateways
• Experience building financial, trading, or fintech platforms where data consistency, performance, and reliability are critical
• Background contributing to design systems or component libraries used across multiple teams
• Experience with infrastructure as code (Terraform) and cloud infrastructure automation

Company Culture & Perks

• Topstep is an engaging working environment which ranges from fully remote to hybrid. We foster a culture of collaboration with cameras-on during meetings and a robust Slack environment for communication.
• 10 Company-paid Holidays and generous Family Leave. Paid time off is accrued monthly.
• Competitive 401(k) matching, health, dental, and vision insurance is offered for full time employees
• Vacations are encouraged with a bonus for taking 5 consecutive days. Employee referrals are bonused. Topstep offers a food and groceries budget and contributes towards health and wellness.

New Hire Base Salary Range

• $157,000-$193,000
• 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 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 and cover letter!

At this time immigration sponsorship is not available for this position (including H-1B, STEM OPT training plans, etc.).