Senior Software Engineer (C#)

Senior Staff Software Engineer

We are hiring a Senior Staff Software Engineer to join the API & Middleware Group, a central platform team responsible for building scalable APIs, middleware services, and event-driven systems used across the organization.

This role focuses on designing and operating high-performance, low-latency services that run under significant load and strict reliability requirements. You will work on distributed, data-intensive systems that enable system-to-system integration and platform-level capabilities.

This role is ideal for an experienced.NET engineer who thrives on ownership, stays up to date with the newest.NET technologies, and brings deep expertise to high-load, low-latency systems.

You will collaborate closely with experienced engineers, tech leads, and QA partners, contributing to architecture, implementation, and operational excellence.

Responsibilities

Primary duties will include:

• Design and develop low-latency solutions using the latest.NET technologies; build performant, scalable backend services from scratch or improve existing ones
• Write well-designed, testable, and efficient code; ensure designs are in compliance with specifications
• Tackle live production challenges, including troubleshooting and performance issues
• Do proof of concepts to test out various ideas and technologies
• Support continuous improvement by investigating alternatives and technologies and presenting these for architectural review
• Mentor and support engineers with technical direction and best practices
• Participate in code reviews (PRs), design sessions, and agile ceremonies; contribute as a strong team player
• Work closely with team leads, stakeholders, and other teams across the company
• Continuously explore and evaluate new technologies that could enhance the platform

Tech stack you'll work with:

• Languages & Frameworks: C#,.NET Core, ASP.NET Core
• Architecture: Microservices, event-driven systems (Kafka, Redpanda), CQRS
• Cloud & Infrastructure: Azure, Kubernetes, Docker, Rancher, TeamCity, Octopus, Grafana
• Databases: MS SQL Server (T-SQL), NoSQL, PostgreSQL
• Tooling: GitHub, Visual Studio, VS Code, Rider, ReSharper
• AI & Developer Tools: MS Copilot, GitHub Copilot, Claude

Qualifications

What we're looking for:

• Minimum 5+ years' experience building global enterprise-level systems
• Knowledge of financial markets or a strong desire to learn
• Proven hands-on experience designing and developing enterprise applications using C# /.NET Core /.NET 8 or higher
• Solid grasp of.NET Core APIs, high-load systems, multithreading, and performance tuning
• Experience developing distributed systems using microservice architecture (event-based)
• Experience with messaging systems like Redpanda and Kafka
• Hands-on experience with Kubernetes and containerization (Docker); experience working on cloud platforms (Azure preferred)
• Excellent knowledge of relational databases (SQL) and NoSQL databases
• Strong communication skills and the ability to collaborate across teams
• A growth mindset and eagerness to stay current with industry trends

Education:

• BS/MS degree in Computer Science, Engineering, or a related subject

What we offer:

• Work on mission-critical systems used globally
• Ownership, and room to grow technically and personally
• A strong, collaborative engineering culture with talented peers
• Hybrid work flexibility
• Support for continued technical and professional development