Senior Software Engineer

Topstep

10d•$155,000 - $200,000•Hybrid

About The Position

Are you an engineer who loves building systems that are both powerful and elegant? Topstep is looking for a Senior Software Engineer to own and evolve critical components of our trading platform. In this role, you'll design and build the systems that power real-time trading, market data delivery, and brokerage integrations — the systems thousands of active traders depend on with real money on the line. You'll work primarily in a modern .NET stack, building cloud-native services that handle high-throughput workloads, and occasionally work across the stack in our React/TypeScript frontend. This isn't just about shipping features — you'll shape architectural decisions, establish engineering standards, and ensure our platform scales reliably as we grow. You'll own your systems end-to-end, from initial design through production operations. This role is ideal for someone who combines strong technical depth with pragmatic engineering judgment. You'll balance robust, maintainable systems against the reality of evolving business requirements, contribute to technical strategy, mentor other engineers, and help define what engineering excellence means at Topstep.

Requirements

5 + years of software engineering experience building and shipping production systems at scale.
Strong proficiency in C# and the .NET ecosystem, with experience building production services.
Experience designing service boundaries and API versioning in a microservices or modular architecture.
Experience building distributed, high-availability systems, including asynchronous, event-driven communication between services (e.g., message queues, pub/sub, or streaming).
Solid database experience with PostgreSQL or SQL Server, including schema design, query optimization, and transactional behavior.
Experience with observability tools and distributed tracing in production environments.
Proven track record of owning production systems, including debugging and incident response.
Experience with container technologies (Docker) and cloud platforms (AWS)
Strong testing mindset with practical experience across unit, integration, and system testing.
Excellent problem-solving skills, with the ability to debug complex issues across multiple systems.
Clear communication, including the ability to explain technical trade-offs to both engineering and product stakeholders.

Nice To Haves

Kubernetes experience (EKS or equivalent), Helm, or GitOps (ArgoCD) tooling.
Experience with React, TypeScript, or other modern frontend frameworks.
Experience with real-time client comms (SignalR/WebSockets).
Background in high-throughput, low-latency systems, including performance tuning across multiple services.
Incident leadership (RCA, remediation follow-ups).
Previous work in financial services, fintech, or other compliance-regulated environments.
Understanding of trading systems, market data, or brokerage operations.

Responsibilities

Design and build services and APIs that power core trading platform capabilities.
Own features end-to-end, from technical design through production deployment, monitoring, and iteration.
Collaborate with product and design to translate user needs into scalable, maintainable technical solutions.
Contribute to system architecture decisions, establishing patterns and practices that other teams can follow.
Write clean, well-tested code with strong focus on reliability, performance, and operational excellence.
Participate in on-call rotations, respond to incidents, and drive continuous improvement of system reliability.
Build and maintain observability into your systems through metrics, logging, and distributed tracing.
Occasionally work across the stack, contributing to the React/TypeScript frontend as features require.
Mentor engineers through code reviews, pairing sessions, and sharing knowledge about system design and best practices.
Balance technical debt against feature delivery, making thoughtful trade-offs based on business priorities and technical constraints.
Strengthen engineering culture through documentation, tooling improvements, and process refinements.