Lexo is hiring a Senior Java Developer to design and build robust, scalable backend APIs and services. You will join a cross-functional team and be supported by senior technical leadership while working on modern Java stacks and learning to interface with an existing HPE Tandem (NonStop) mainframe environment.

What you will do

• Design, implement and maintain backend services and RESTful APIs using Java (Java 17+).
• Build microservices with Spring Boot and related Spring ecosystem technologies.
• Write automated tests (unit, integration, end-to-end) and participate in code reviews to maintain high quality.
• Collaborate with product owners, UX, QA and DevOps across the full SDLC.
• Troubleshoot, profile and optimize services for performance, reliability and scalability.
• Learn and integrate with the legacy HPE Tandem/COBOL systems where required.
• Apply practical AI/ML tools and automation to improve development and operational productivity.

Required qualifications

• Strong Java fundamentals and production experience with Java 17+.
• Hands-on experience with Spring Boot and microservices architecture.
• Solid testing practices: unit, integration and automated E2E testing.
• Practical experience with containerization (Docker) and familiarity with Kubernetes.
• Strong problem-solving, communication and technical writing skills.
• Experience working in Agile teams (Scrum or Kanban).

Nice-to-have

• Experience with HPE Tandem (NonStop) or COBOL systems, or willingness to learn legacy mainframe integration.
• Familiarity with FX, money markets, or financial services domains.
• Experience applying AI/ML tools in a software engineering workflow.

What we offer

• Permanent role with career growth toward Senior Specialist or technical leadership.
• Collaborative, supportive team and mentorship from senior engineers.
• Hybrid work model: downtown Toronto office plus 2 days/week onsite.

Logistics

• Expected start date: Jun 01, 2026
• Job type: Permanent
• Location: Downtown Toronto, ON (hybrid — 2 days/week onsite)
• Salary: TBD

How to apply

Please submit your resume and a brief note describing relevant Java projects or systems you have built, and any experience with legacy systems or financial domain work.

Lexo is an equal opportunity employer. We welcome candidates from diverse backgrounds and are committed to creating an inclusive environment for all employees.

Job Types: Full-time, Permanent

Pay: From $90,000.00 per year

Benefits:

• Dental care
• Extended health care
• Paid time off
• Vision care

Flexible language requirement:

• French not required

Education:

• Bachelor's Degree (required)

Experience:

• Java: 5 years (required)
• Mainframe development: 1 year (preferred)
• COBOL: 1 year (preferred)
• Spring Boot: 3 years (required)
• Kubernetes: 1 year (required)

Work Location: Hybrid remote in Toronto, ON