Sina Hemmati

Results-driven Software Developer with 8+ years of experience, specializing in Java development and Python for machine learning applications. Proficient in Spring / Spring Boot, Quarkus, REST, SOAP, gRPC, SQL, Docker, OpenShift, Jenkins, Git, and ORM frameworks, with expertise in designing and architecting scalable, high-performance systems.

Recognized as the top contributor, earning the #1 ranking on GitHub Contributions on a team of 20+ developers every single year and multiple awards for top performance. Skilled at high-level system design, consistently delivering high-quality solutions on time and within budget while optimizing processes and enhancing efficiency. Passionate about driving innovation through technical excellence and a continuous learning mindset.

CIBC - Senior Software Developer

2019 - Present

gRPC API Developer - Core Customer Banking 2024 - Present

• Building CIBC’s next-gen API system using gRPC, Quarkus, and Java 21.
• Designed and developed a high-performance, thread-safe, concurrent, asynchronous, non-blocking service architecture.
• Integrated service mesh with JWT authentication (Istio & Envoy filters), implementing robust authorization and access control mechanisms.
• Developed caching strategies and logging solutions for enhanced system efficiency.
• Led Test-Driven Development (TDD) efforts and deployed solutions to OpenShift

Microservice API Developer - Core Customer Banking 2020-2024

• Key member of one of CIBC’s most critical teams, responsible for building and maintaining customer banking microservices (client addresses, emails, products, tax details, notifications, etc.).
• Designed and developed multiple high-impact microservices, owning the majority of services on the team.
• #1 contributor in GitHub every year, outperforming a team of 20+ developers based on commits, PR reviews, and code contributions.
• Led multiple projects, including a large-scale government-mandated API project. Managed everything from business requirements, user story reviews, high-level design (HLD) analysis, to full development and deployment.
• Proposed and implemented process improvements that enhanced development workflows and system efficiency.

Microservice API Developer - Notification System 2019-2020

• Developed the retry software for CIBC SMS system, ensuring successful message delivery by implementing an intelligent status check and resend mechanism.
• Transformed legacy SOAP web services into modern RESTful microservices, improving performance and maintainability.
• Received Top Performer Award (2020) for outstanding contributions to system improvements.
• Developed an XML-to-JSON adapter to enable SOAP-based applications to communicate with RESTful APIs, improving interoperability between legacy and modern systems.

Melal General Trading LTD - Software Developer

2017 - 2019

• Developed and customized a full-featured Currency Exchange POS system with secure AWS RDS and S3 storage for transactions and customer documents.
• Integrated real-time exchange rates, AML background checks, and live cash register balance tracking for compliance and efficiency.
• Connected the system to receipt printers, cash registers, barcode scanners, and ID scanners, automating customer transactions.
• Implemented automated receipt generation with branding customization and SMS-based receipt delivery.
• Designed a high-availability system with industry-leading security and 99.999% uptime.

[1.5 Years] University of Toronto - Artificial Intelligence (Certificate)

[4 Years] Toronto Metropolitan University - Computer Science (Bachelors)