Lead Backend Developer (C#/.NET Trading Systems)

Insight Global is partnering with a leading financial institution to hire a Lead Backend Developer for a high-impact trading technology team. This opportunity is ideal for a highly technical software engineer who is passionate about coding and solving complex technical challenges.

This is not a management-focused position. We are specifically seeking a senior developer who remains hands-on, writes production code daily, and has a deep understanding of software engineering fundamentals. The successful candidate will help build and enhance real-time trading platforms, develop scalable backend services, and contribute to the architecture of mission-critical systems.

Candidates should be comfortable completing a rigorous technical assessment covering coding, object-oriented design, algorithms, data structures, system design, and SQL.

Key Responsibilities

- Design, develop, and enhance high-performance backend applications using C# and .NET
- Build scalable APIs, microservices, and event-driven applications
- Develop new platform capabilities and features from the ground up
- Write clean, maintainable, and production-ready code
- Design and implement scalable distributed systems
- Optimize application performance and database queries
- Work with messaging and streaming technologies such as Kafka, MQ, or similar platforms
- Participate in code reviews and drive engineering best practices
- Collaborate with engineers, architects, and business stakeholders to deliver complex technical solutions
- Contribute to architectural discussions and technical decision-making

Required Qualifications

- 8+ years of professional software development experience
- 6+ years of hands-on C# and .NET development experience




- Extensive experience with .NET Framework 4.8 and/or .NET 8
- Robust expertise building backend services, APIs, and distributed systems
- Proven experience developing enterprise applications or major platform features from scratch
- Strong understanding of object-oriented programming, design patterns, and software engineering principles
- Advanced knowledge of algorithms and data structures
- Experience with system design, scalability, and performance optimization
- Strong SQL skills, including query tuning and database performance optimization
- Experience with messaging or event-driven architectures using Kafka, MQ, RabbitMQ, or similar technologies
- Strong understanding of multithreading, concurrency, and asynchronous programming
- Ability to discuss architectural decisions, tradeoffs, and engineering best practices in depth

Preferred Qualifications

- Trading, capital markets, or financial services experience
- Experience building high-throughput, low-latency applications
- Cloud experience with Azure, AWS, or GCP
- Kubernetes or OpenShift experience
- Software architecture experience
- Experience in highly technical engineering environments with strong coding standards

Ideal Candidate

- Spends the majority of their day coding and designing software
- Possesses exceptional software engineering fundamentals
- Can confidently pass advanced coding and system design assessments
- Has built complex backend systems rather than primarily maintaining existing applications
- Enjoys solving challenging technical problems at scale
- Thrives in highly collaborative, engineering-driven environments

Please Note: We may use artificial intelligence tools to assist with the screening, assessment, or selection of potential applicants for this position.

📌 Senior C#/.NET Developer (Toronto)
🏢 Insight Global
📍 Toronto