Java Backend Specialist - Spring Boot & Multithreading - Operate

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

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 collection, heap/stack behavior, and performance tuning
• Extensive experience with Java, Spring, Spring Boot, and microservices architecture
• Experience building Agentic AI-enabled backend components using Java (e.g., AI orchestration, intelligent agents, workflow coordination)
• Strong experience developing RESTful APIs and integrating with distributed systems
• Proficiency with SQL and relational databases (PostgreSQL, Oracle, MySQL), including query optimization; exposure to NoSQL (Redis, MongoDB) is an asset
• Exposure to frontend technologies (HTML, Angular, TypeScript) to support backend-to-UI integration
• Strong testing skills using JUnit, Mockito, Testcontainers; experience with performance testing tools is a plus
• Experience with CI/CD pipelines, version control, and containerization (Docker, with Kubernetes exposure preferred)
• Familiarity with observability tools for logs, metrics, and tracing
• Solid grasp of SOLID principles, clean code, and backend design patterns
• Strong communication skills and the ability to work effectively within Agile delivery teams

Total Rewards

The salary range for this position is $72,000 - $138,000, and individuals may be eligible to participate in our bonus program. Deloitte is fair and competitive when it comes to the salaries of our people. We regularly benchmark across a variety of positions, industries, sectors, targets, and levels. Our approach is grounded on recognizing people's unique strengths and contributions and rewarding the value that they deliver.

Our Total Rewards Package extends well beyond traditional compensation and benefit programs and is designed to recognize employee contributions, encourage personal wellness, and support firm growth. Along with a competitive base salary and variable pay opportunities, we offer a wide array of initiatives that differentiate us as a people-first organization. On top of our regular paid vacation days, some examples include: $4,000 per year for mental health support benefits, a $1,300 flexible benefit spending account, firm-wide closures known as "Deloitte Days", dedicated days of for learning (known as Development and Innovation Days), flexible work arrangements and a hybrid work structure.

Our promise to our people: Deloitte is where potential comes to life.

Be yourself, and more.
We are a group of talented people who want to learn, gain experience, and develop skills. Wherever you are in your career, we want you to advance.

You shape how we make impact.
Diverse perspectives and life experiences make us better. Whoever you are and wherever you're from, we want you to feel like you belong here. We provide flexible working options to support you and how you can contribute.

Be the leader you want to be
Some guide teams, some change culture, some build essential expertise. We offer opportunities and experiences that support your continuing growth as a leader.

Have as many careers as you want.
We are uniquely able to offer you new challenges and roles - and prepare you for them. We bring together people with unique experiences and talents, and we are the place to develop a lasting network of friends, peers, and mentors.

The next step is yours

At Deloitte, we are all about doing business inclusively - that starts with having diverse colleagues of all abilities. Deloitte encourages applications from all qualified candidates who represent the full diversity of communities across Canada. This includes, but is not limited to, people with disabilities, candidates from Indigenous communities, and candidates from the Black community in support of living our values, creating a culture of Diversity Equity and Inclusion and our commitment to our AccessAbility Action Plan , Reconciliation Action Plan and the BlackNorth Initiative .

We encourage you to connect with us at View email address on onjobcentre.ca if you require an accommodation for the recruitment process (including alternate formats of materials, accessible meeting rooms or other accommodations) or View email address on onjobcentre.ca for any questions relating to careers for Indigenous peoples at Deloitte (First Nations, Inuit, Métis).

When you apply, we will review your application using Deloitte's Global Talent Standards to ensure a consistent recruitment experience. Our recruitment advisors and hiring teams will utilize human screening combined with AI technology to help identify the skills and qualities that matter most to our business, while safeguarding your privacy and using AI responsibly.

Deloitte Canada has 20 offices with representation across most of the country. We acknowledge that Deloitte offices stand on traditional, treaty, and unceded territories in what is now known as Canada. We recognize that Indigenous Peoples have been the caretakers of this land since time immemorial, nurturing its resources and preserving its natural beauty. We acknowledge this land is still home to many First Nations, Inuit, and Métis Peoples, who continue to maintain their deep connection to the land and its sacred teachings. We humbly acknowledge that we are all Treaty people, and we commit to fostering a relationship of respect, collaboration, and stewardship with Indigenous communities in our shared goal of reconciliation and environmental sustainability.

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