I am a Senior Java Developer with over 14 years of hands-on experience designing, building, and maintaining enterprise-level web applications, primarily in the telecom and technology sectors. I specialize in developing scalable backend systems using Java, Spring, and J2EE, building RESTful APIs, and optimizing performance for large relational databases such as Oracle and MS SQL. I have experience working across the full software development lifecycle, from requirements gathering and architecture design to deployment and production support. Comfortable working in both legacy and cloud-based environments including GCP and AWS, I also focus on automation, DevOps, and generative AI tools. I am adept at debugging complex systems, collaborating with cross-functional teams, and delivering clean, maintainable code in Agile settings.…

Vadim Reznik

PRO

I am a Senior Java Developer with over 14 years of hands-on experience designing, building, and maintaining enterprise-level web applications, primarily in the telecom and technology sectors. I specialize in developing scalable backend systems using Java, Spring, and J2EE, building RESTful APIs, and optimizing performance for large relational databases such as Oracle and MS SQL. I have experience working across the full software development lifecycle, from requirements gathering and architecture design to deployment and production support. Comfortable working in both legacy and cloud-based environments including GCP and AWS, I also focus on automation, DevOps, and generative AI tools. I am adept at debugging complex systems, collaborating with cross-functional teams, and delivering clean, maintainable code in Agile settings.…

Available to hire

I am a Senior Java Developer with over 14 years of hands-on experience designing, building, and maintaining enterprise-level web applications, primarily in the telecom and technology sectors. I specialize in developing scalable backend systems using Java, Spring, and J2EE, building RESTful APIs, and optimizing performance for large relational databases such as Oracle and MS SQL.

I have experience working across the full software development lifecycle, from requirements gathering and architecture design to deployment and production support. Comfortable working in both legacy and cloud-based environments including GCP and AWS, I also focus on automation, DevOps, and generative AI tools. I am adept at debugging complex systems, collaborating with cross-functional teams, and delivering clean, maintainable code in Agile settings.

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Skills

Experience Level

Java
Expert
Spring
Expert
SQL
Expert
Jira
Expert
GitHub
Expert
Python
Expert
JavaScript
Intermediate
AWS
Intermediate
Django
Intermediate
Docker
Intermediate
Kubernetes
Intermediate
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Language

English
Fluent
Russian
Fluent
Hebrew (modern)
Fluent

Work Experience

Ordering Application Developer Consultant at TELUS Canada
January 1, 2025 - August 27, 2025
Led integration of legacy ordering systems with the new CES9 billing platform after its transition to AWS, ensuring smooth data flow and resolving compatibility issues. Created development estimates, supported QA and engineering teams by defining testing processes that improved test coverage by 30% and cycle times. Authored detailed documentation including user manuals and technical specs. Collaborated with internal teams to address cross-system issues and maintain platform stability and efficiency.
Senior Java Developer at ROGERS Canada
January 1, 2024 - August 27, 2025
Contributed on both Implementation and On-Going Support teams. Developed new features and maintained post-deployment support for Ordering-to-Billing integration, improving data accuracy and operational flow. Resolved a critical issue blocking order submissions by fixing the internal testing tool. Improved test environment availability by 25%, investigated production issues, created debug patches to address high failure rates, and worked closely with project managers and testers to validate fixes and maintain service continuity throughout the software lifecycle.
Senior Java Developer at TELUS Canada
January 1, 2023 - August 27, 2025
Managed production support team responsible for the Ordering Backend and Order Capture UI systems. Led a team of 7 developers supporting production maintenance and enhancements. Troubleshot production issues, resolved performance bottlenecks to reduce response times by up to 30%, improved unit test coverage by 15%, mentored engineers, coordinated integration work, and maintained updated documentation. Participated in daily war room meetings to address urgent issues and collaborated with project managers to align technical efforts with business goals.
Low-Level Support Engineer, PSM at AMDOCS Ltd
January 1, 2017 - August 27, 2025
Supported the OMS platform across core technical layers for multiple product versions. Provided direct support for high-profile enterprise clients by investigating system internals and troubleshooting critical service disruptions. Analyzed system behavior to identify root causes and implemented custom solutions. Collaborated with development teams and stakeholders to ensure coordinated and timely issue resolution. Conducted bottleneck analysis and delivered stable fixes.
Java Backend Developer at AMDOCS Ltd
January 1, 2015 - August 27, 2025
Developed RESTful services and backend components for large telecom clients like Telefónica Argentina and AT&T. Designed and optimized service communication, contributed to test automation efforts, and participated in cross-team defect analysis calls. Mentored new developers on codebase, tools, and best practices.
Java Mobile Developer at AMDOCS Ltd
January 1, 2013 - August 27, 2025
Built customer-facing web tools for telecom self-service platforms, improving customer satisfaction and reducing CSR workload. Developed user-friendly frontends and robust backend services. Created and maintained JUnit unit tests to support automation and prevent regressions.
Java Developer at AMDOCS Ltd
January 1, 2012 - August 27, 2025
Investigated and resolved backend system issues for Vodafone Netherlands project. Reviewed code to identify bugs and inefficiencies, implemented effective solutions to stabilize system performance, and provided interim workarounds to maintain service levels.

Education

B.Tech. in Software Engineering at Negev Academic College of Engineering, Beer-Sheva, Israel
January 11, 2030 - August 27, 2025

Qualifications

GCP Associate Cloud Engineer
January 1, 2023 - August 27, 2025
SAFe4 Practitioner Certification
January 1, 2022 - August 27, 2025

Industry Experience

Telecommunications, Software & Internet
    paper Vendor & Customer Management Web Platform

    Built the Full-stack Django marketplace platform with vendor/customer management, real-time messaging, and payment processing, deployed on Google Cloud Platform with PostgreSQL database and mobile-responsive design.