We are seeking a highly accomplished Senior Software Developer for an enterprise contract opportunity based in Toronto. In this role, you will take on a premier full-stack software engineering, application architecture, and technical delivery capacity, specializing in the design, development, and enhancement of scalable, multi-tier enterprise solutions.

As a Senior Software Developer, you will bridge the gap between business requirements, complex backend architectures, responsive modern frontends, and relational/NoSQL data platforms. Operating fully onsite in Toronto, you will lead the implementation of secure RESTful APIs and microservices using Java and Spring Boot, build user-friendly and accessible user interfaces using React and Angular, and design high-performance database schemas across PostgreSQL, PL/pgSQL, and Azure Cosmos DB. This position demands a seasoned development authority with extensive full-lifecycle software delivery tenure, robust automated testing and CI/CD capabilities, and a commitment to delivering resilient, high-quality enterprise applications.

Location: Toronto, ON

Assignment Type: Onsite (5 days per week)

Contract Duration: 10-month contract (with potential for extension)

Advantages

- Modern Full-Stack Stack: Hands‑on development across Spring Boot, Java, React, TypeScript, and modern JavaScript frameworks.
- Diverse Data Ecosystem: Architect enterprise data solutions using PostgreSQL, PL/pgSQL, Azure Cosmos DB, and Redis caching.
- Cloud & Microservices Scope: Build and deploy scalable microservices leveraging Microsoft Azure services and modern API patterns.
- Comprehensive Quality Engineering: Lead automated testing frameworks across JUnit 5, Mockito, Jest, and Playwright within CI/CD pipelines.





Responsibilities

- Translate business requirements and technical systems specifications into scalable, secure, and fully tested enterprise applications.
- Develop detailed technical designs, architecture patterns, and programming specifications for n-tier application frameworks.
- Design, build, and maintain robust backend microservices, RESTful APIs and batch processes utilizing Spring Boot and the broader Spring Framework.
- Design and implement modern, responsive, and accessible UI components and web applications utilizing React, Angular, TypeScript, and modern JavaScript.
- Architect and optimize database structures, normalization models, indexing strategies, stored procedures, and functions in PostgreSQL, PL/pgSQL and Azure Cosmos DB.
- Implement data persistence layers and object-relational mapping utilizing JPA, Hibernate, or MyBatis.
- Integrate caching solutions and middleware adapters using tools such as Redis to maximize backend throughput and minimize latency.
- Build, maintain, and execute automated test suites spanning unit, integration, API and end-to-end testing utilizing JUnit 5, Mockito, Jest and Playwright.
- Troubleshoot, debug, and resolve complex application errors, performance bottlenecks, and integration defects across development, test and production environments.
- Support application deployments,



data conversions, migrations and system integration testing in close collaboration with infrastructure and DevOps teams.
- Ensure all application interfaces comply with corporate security standards, performance benchmarks, and accessibility regulations (AODA/WCAG).
- Participate actively in Agile sprint ceremonies, technical design walkthroughs, backlog refinements and peer code reviews.

Qualifications

- Core Technical & Application Development Requirements
- Enterprise Development Tenure: Minimum 10+ years of hands‑on professional experience developing scalable, n-tier enterprise software applications.
- Backend Architecture (Java / Spring): Deep expertise in application design and microservices architecture using Java, Spring Boot, and the Spring ecosystem (Core, MVC, Security, Data, Batch).
- Modern Frontend Frameworks: Demonstrated proficiency building component-based, responsive web applications using JavaScript/TypeScript alongside React or Angular.
- Database & ORM Mastery: Strong expertise in database design, SQL development, and query tuning with PostgreSQL, PL/pgSQL, and Azure Cosmos DB, alongside hands‑on experience with ORM frameworks (JPA, Hibernate, MyBatis).
- Application Design Patterns: Proven expertise in up-to-date design patterns (MVC, integration patterns, caching strategies), application performance optimization and troubleshooting.
- Test Automation & Quality Engineering: Strong experience in automated testing across the test pyramid, including JUnit 5, Mockito, Jest, and modern end-to-end testing frameworks (Playwright, Katalon).
- Requirements Elicitation: Proven experience gathering, analyz

📌 Senior Software Developer (Toronto)
🏢 Randstad
📍 Toronto