Role: Senior Backend Developer

Length: 1 year contract (strong potential for extension)

Rate: $90-$100/hr INC

Location: Downtown Toronto (1 day onsite)

Your New Company

Join a high-performing digital engineering team within a leading, enterprise-scale organization focused on building modern, scalable platforms. This team operates in a fast-paced environment, driving innovation through microservices and distributed architecture to support millions of users across digital products.

Your New Role

As a Senior Backend Developer, you will play a critical hands-on role in designing, building, and maintaining scalable backend systems and APIs. You will contribute directly to the development of microservices within a distributed architecture, while also supporting ongoing enhancements and maintenance of existing systems.

This is a highly technical, coding-heavy role requiring strong ownership and deep backend expertise.

Key Responsibilities:

- Design, develop, and maintain scalable backend services using Java and Kotlin
- Build and optimize APIs within a microservices architecture
- Drive system design and contribute to architectural decisions across distributed systems
- Write high-quality, production-ready code with strong testing practices
- Maintain and enhance existing backend services and microservices
- Work within event-driven architectures supporting real-time systems
- Collaborate closely with cross-functional engineering teams

What You’ll Need to Succeed

- 10+ years of backend development experience, with a strong focus on building scalable systems
- Proven senior-level experience as a hands-on Backend Developer (not just design/lead)
- Solid expertise in Java and Kotlin




- Demonstrated experience building scalable APIs and distributed systems
- Deep experience with microservices architecture
- Strong hands-on experience with Spring / Spring Boot
- Solid knowledge of SQL and relational databases
- Experience working with event-driven architectures
- Strong system design capabilities and ability to influence architecture
- Experience with unit testing and development testing practices
- Proven experience maintaining and evolving existing production microservices

Nice-to-Have:

- Experience with Google Cloud Platform (GCP)

What You’ll Get in Return

- Opportunity to work on large-scale, high-impact backend platforms
- Exposure to modern engineering practices across distributed systems
- A highly cooperative, engineering-driven team environment
- Competitive compensation aligned to senior-level market rates
- Flexible hybrid working model

What You Need to Do Now

If you’re a true senior-level backend developer with strong expertise in Java, Kotlin, and microservices, apply directly or reach out for a confidential discussion.

Vacancy Status: This advertisement is for a current vacancy with an active client requirement. We are actively seeking qualified candidates for this position.

Artificial Intelligence (AI) in Recruitment: Artificial intelligence (AI) tools may be used to support certain administrative aspects of the recruitment process, such as reviewing application information, generating candidate summaries, and scheduling activities. All hiring decisions are made by qualified recruitment professionals and/or hiring managers, with appropriate human oversight throughout the process.

📌 Sr Backend Developer - mississauga
🏢 Hays
📍 Mississauga