Senior Software Engineer – Java Full Stack

Senior Software Engineer – Java Full Stack We are seeking a Senior Software Engineer to design and build resilient enterprise services and web applications in a hybrid work environment. This role focuses on developing secure, scalable solutions using Java, Spring Boot, JavaScript, SQL, and AWS. The ideal candidate will collaborate with cross‑functional teams to enhance cards and payments processing, optimize data flows, and improve customer and business partner experiences across the platform lifecycle.
Key Responsibilities
Design and develop robust backend services using
Java and Spring Boot
to support high‑volume transaction processing and integrations
Build clean, maintainable, and testable APIs and microservices following coding best practices
Develop and optimize
SQL / PL‑SQL queries in MySQL
to ensure performance, data integrity, and efficiency
Create responsive and intuitive frontend components using
JavaScript
for business and operations workflows
Configure and leverage
AWS services
(compute, storage, database, messaging) for scalable and cost‑efficient deployments
Develop automated unit, integration, and component tests and support CI/CD pipelines
Participate in
code reviews and technical discussions
to ensure engineering standards and continuous improvement
Troubleshoot production issues, perform root cause analysis, and implement preventive solutions
Collaborate with product owners, business analysts, and QA teams to refine requirements and deliver business value
Create and maintain
technical documentation, system designs, and architecture diagrams
Apply secure coding practices and ensure compliance with payment and data security regulations
Mentor junior engineers and promote best practices in full‑stack development and cloud‑native solutions
Identify automation opportunities to improve build, deployment, and monitoring processes
Required Qualifications
Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent experience)
6–9 years of experience
in software engineering, with a focus on backend or full‑stack development
Strong expertise in
Java and Spring Boot , including RESTful services and microservices architecture
Advanced proficiency in
SQL / PL‑SQL and MySQL
(query tuning, schema design, transactional systems)
Hands‑on experience with
AWS services
for application hosting, scalability, and monitoring
Solid experience with
JavaScript
for web application development and API integration
Experience in
cards and payments domain
(authorization, settlement, disputes)
Strong understanding of software development lifecycle, best practices, and secure coding principles
Preferred Qualifications
Experience working in high‑volume transaction environments
Familiarity with CI/CD tools and DevOps practices
Exposure to regulatory and compliance requirements in financial systems
Location Ontario, Canada
Salary Range 69,000 - 110,000
This position is also eligible for Cognizant’s discretionary annual incentive program, based on performance and subject to the terms of Cognizant’s applicable plans.
-- We're excited to meet people who share our mission and can make an impact in a variety of ways. Don't hesitate to apply, even if you only meet the minimum requirements listed. Think about your transferable experiences and unique skills that make you stand out as someone who can bring new and exciting things to this role.
Cognizant is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by law.
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