Alexander Zagaynov

Lead Software Engineer with 25+ years of experience building and modernizing production systems across enterprise, fintech, and cloud environments.

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Core Skills

Languages
Ruby, Python, Java, Kotlin, JavaScript, SQL, Bash
Frameworks
Ruby on Rails, Spring Boot, Vue.js
Cloud & DevOps
Azure, AWS, GCP, Kubernetes, Docker, Terraform, Ansible, Azure DevOps, Jenkins
Data & Messaging
PostgreSQL, MongoDB, Redis, Kafka, RabbitMQ, REST, GraphQL, SOAP
Security & Quality
Microsoft Entra ID, TLS/PKI, SonarQube, Veracode

Certifications

Azure Administrator Associate (2025), Azure AI Fundamentals (2023), AWS Certified Solutions Architect - Associate (2021), RHCE (2017), RHCSA (2017), Ansible (2017).

Experience

Lead Software Engineer · AT&T

Oct 2023 - Present

  • Lead modernization and support of 2 large enterprise applications (Java/Kotlin + Vue.js) and about 10 supporting services.
  • Migrated systems from Spring Boot 2 to 4 and Vue 2 to 3, reducing technical debt and improving maintainability.
  • Integrated Microsoft Entra ID, strengthened TLS/internal CA/WAF security, integrated SonarQube and Veracode, and implemented CI/CD pipelines in Azure DevOps.

Lead Software Engineer · EPAM Systems

Apr 2020 - May 2023

  • Worked with a European banking platform and live banks in high-load environments.
  • Resolved critical production incidents across Ruby and Java microservices, including performance improvements up to 100x.
  • Delivered PSD2 integrations across REST, SOAP, and messaging; modernized services and CI/CD pipelines; collaborated with SRE/ops and mentored engineers.

Software Engineer · Red Hat

Dec 2016 - Jan 2020

  • Contributed to OpenShift QE and ManageIQ hybrid cloud platform development.
  • Built test frameworks, led AWS STS integration, upgraded SDKs, and contributed to AWS, Azure, and GCP cloud integrations.
  • Worked as an active open-source contributor across code, reviews, and upstream collaboration.

Full-Stack Engineer · Mamapedia

2015 - 2016

  • Modernized a legacy Rails platform, improved performance by about 2x, and rebuilt the email delivery system.

ERP & Infrastructure Consultant · Independent and client work

1998 - 2014

  • Delivered ERP, WMS, CRM, and enterprise infrastructure solutions across multiple industries, including custom business platforms and data-center modernization projects.

Professional Development

IT Project Management, I Heart Stats (Notre Dame, edX), Entrepreneurship 101 (edX).