Java Backend Specialist - Spring Boot & Multithreading - Operate

Java Backend Specialist - Spring Boot & Multithreading - Operate

Posting Start Date: 3/18/26

Job Type: Temporary Contract Work Model: Hybrid Reference code: 132690 Primary Location: Toronto, ON All Available Locations: Toronto, ON

Our Purpose At Deloitte, our Purpose is to make an impact that matters. We exist to inspire and help our people, organizations, communities, and countries to thrive by building a better future. Our work underpins a prosperous society where people can find meaning and opportunity. It builds consumer and business confidence, empowers organizations to find imaginative ways of deploying capital, enables fair, trusted, and functioning social and economic institutions, and allows our friends, families, and communities to enjoy the quality of life that comes with a sustainable future. And as the largest 100% Canadian-owned and operated professional services firm in our country, we are proud to work alongside our clients to make a positive impact for all Canadians.

By living our Purpose, we will make an impact that matters.

• Have many careers in one Firm.
• Enjoy flexible, proactive, and practical benefits that foster a culture of well-being and connectedness.
• Learn from deep subject matter experts through mentoring and on the job coaching

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We are seeking a skilled Backend Developer to join our team on a 1‑year fixed-term contract. In this role, you will design, build, and optimize high‑performance backend services using Core Java and Spring Boot, with a strong emphasis on multithreading, concurrency, and scalable microservices.

You will contribute to the development of AI‑enabled and agentic systems, support distributed architectures, and partner with cross‑functional teams to deliver resilient, low‑latency solutions. This is an ideal opportunity for someone who enjoys solving complex backend problems, working close to the JVM, and applying modern engineering and AI-driven patterns at scale.

What will your typical day look like?

• Design, develop, and maintain backend services and APIs using Core Java (8/11/17+), Spring, and Spring Boot, applying advanced multithreading and concurrency patterns to build high‑throughput, low‑latency systems.
• Contribute to agentic AI–enabled backend workflows, supporting Java-based AI orchestration, service coordination, and intelligent processing within distributed environments.
• Work within a microservices architecture, integrating RESTful services, messaging platforms (Kafka/RabbitMQ), and relational databases while ensuring scalability and clean separation of concerns.
• Diagnose and resolve performance bottlenecks through profiling, JVM tuning, thread pool optimization, and garbage collection analysis, improving system reliability and throughput.
• Collaborate with frontend and full‑stack teams by supporting backend integrations with HTML, Angular, and TypeScript applications, ensuring efficient API design and data contracts.
• Implement unit, integration, and performance testing, contribute to CI/CD pipelines, and support deployment within containerized environments.
• Enhance service observability and resilience through logging, metrics, tracing, and fault‑tolerant patterns, while contributing to secure coding practices and technical documentation

About The Team This is your opportunity to work in Operate at Deloitte. Operate services harness the latest technologies, talent, and capabilities from all over the world to deliver ongoing outcomes and client value. We do more than traditional business process outsourcing. We do more than just “keeping the lights on.” We work shoulder-to-shoulder with clients and their customers, constantly adapting to the pace of change, to ideate, innovate, and embed continuous advantage at the heart of their operations. And we do it with the kind of drive and passion that comes from loving what you do—and who you do it with.

Enough About Us, Let’s Talk About You You are someone with these skills, experience & qualifications:

• 6+ years of professional Backend Development experience using Core Java (8/11/17+)

• Strong hands‑on expertise in Concurrency & Multithreading, including:

• Thread safety, synchronization, locks, atomics
• Executors, thread pools, fork/join, CompletableFuture

• Non‑blocking and asynchronous processing patterns

• Solid understanding of JVM fundamentals, including memory model, garbage collec…