Available to hire
I’m Anton Stupak, a Senior Full-Stack Engineer with 20+ years of experience delivering scalable web applications across finance, SaaS, insurance, and enterprise platforms. I specialize in PHP development and building accessible, high-performance frontend experiences.
I focus on clean architecture, test-driven development, and measurable business impact. I have a proven track record modernizing legacy systems, improving performance, and delivering data-intensive applications at scale.
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Language
English
Fluent
Ukrainian
Fluent
Work Experience
Software Engineer II at International Code Council
January 1, 2024 - January 1, 2026Delivered new features and refactored templates and functionality for ICC corporate websites, ensuring ADA/WCAG accessibility compliance, optimal performance, and reliability; utilized PHP, SQL, semantic HTML5, JavaScript, OOP, and REST APIs.
Senior PHP Developer II at Sphera Solutions
January 1, 2022 - January 1, 2023Built and maintained data-intensive SaaS platform supporting global environmental compliance and net-zero goals for Fortune 500 industrial clients. Delivered test-driven PHP features for high-volume environmental data processing in a secure, scalable environment.
PHP Developer II at Zacks Investment Research
January 1, 2020 - January 1, 2022Supported development and maintenance of website and backend services for a leading online financial analytics institution. Developed and integrated APIs to deliver new functionality and enhance existing codebase. Automated multi-threaded, data-intensive analytical procedures for greater efficiency; built data manipulation tuners and analytical tools to support financial modeling and reporting. Optimized website performance, resulting in faster page loads and improved user experience. Analyzed logs using Elasticsearch and created a real-time data monitoring dashboard with dynamic visualizations.
Senior Software Engineer I at Pizza Hut Connect
January 1, 2018 - January 1, 2020Implemented core OOP PHP functionality for Pizza Hut.com websites and services, including test-driven, self-documented, high-performance features; performed codebase improvements and PHP 5 to 7 migration. Contributed to Elasticsearch log creation, structuring, analysis, and VEGA visualizations. Built internal tools, including a Redis manager and test APIs to streamline development workflows. Analyzed and visualized complex big data structures with D3.js.
Web Developer II at Chubb Insurance
January 1, 2017 - January 1, 2018Designed and implemented PCI-compliant middleware for secure payment processing using PHP7, REST, SOAP, OAuth, and CURL. Delivered six mobile-first, responsive micro-sites for Latin American markets with inline editing, A/B testing, and cross-browser compatibility. Conducted performance and security analysis and strategic planning for system improvements.
Web Developer II at PANGEA
January 1, 2016 - January 1, 2017Built responsive WordPress front-ends and custom landing pages with pixel-perfect HTML5, CSS3 (LESS/SASS), jQuery, and SVG animations.
Front-end & Full-stack Developer at Various Agencies & Self-Employed Clients
January 1, 2001 - January 1, 2016Front-end and full-stack development for agencies and self-employed clients in Ukraine and the US, focusing on responsive SPAs, landing pages, email templates, and custom CMS platforms.
Senior PHP Developer at Sphera Solutions
January 1, 2022 - January 1, 2023Built and maintained a data-intensive SaaS platform supporting global environmental compliance and net-zero goals for Fortune 500 industrial clients. Delivered test-driven PHP features for high-volume environmental data processing in a secure, scalable environment.
PHP Developer at Zacks Investment Research
January 1, 2020 - January 1, 2022Supported development and maintenance of website and backend services for a leading online financial analytics institution. Developed and integrated APIs to deliver new functionality and enhance existing codebase. Automated multi-threaded, data-intensive analytic procedures for greater efficiency. Built data manipulation tuners and analytic tools to support financial modeling and reporting. Optimized website performance, resulting in faster loading speeds and improved user experience. Analyzed logs using Elasticsearch and created a real-time data monitoring dashboard with dynamic visualizations.
Web Developer at Chubb Insurance
January 1, 2017 - January 1, 2018Designed and implemented PCI-compliant middleware for secure payment processing using PHP7, REST, SOAP, OAuth, and CURL. Delivered six mobile-first, responsive micro-sites for Latin American markets with inline editing, A/B testing, and cross-browser compatibility. Conducted performance and security analyses and strategic planning for system improvements.
Web Developer at Pangea
January 1, 2016 - January 1, 2017Built responsive WordPress front-ends and custom landing pages with pixel-perfect HTML5, CSS3 (LESS), jQuery, and SVG animations.
Web Developer (Freelance) at Various Agencies and Self-Employed Clients
January 1, 2001 - January 1, 2016Front-end and full-stack development for agencies and self-employed clients in Ukraine and the US, focusing on responsive SPAs, landing pages, email templates, and custom CMS platforms.
Software Engineer 2 at International Code Council
January 1, 2024 - January 1, 2026Delivered new feature sets and refactored legacy templates across multiple corporate websites, improving performance, maintainability, and accessibility compliance (WCAG/ADA).
Freelance Web Developer at Various Agencies & Freelance Clients (US & Ukraine)
January 1, 2001 - January 1, 2016Delivered full-stack and frontend solutions for agencies and freelance clients across the US and Ukraine; built SPAs, CMS platforms, landing pages, and email templates.
Web Developer at Kyiv National University of Construction and Architecture
January 1, 2002 - January 1, 2011Long-term role developing web platforms and interactive presentations.
Education
B.S. at Kyiv National University of Construction and Architecture
January 11, 2030 - January 1, 2006Bachelor of Science in Computer Science & Information Technology Design and Management at Kyiv National University of Construction and Architecture – Kyiv, Ukraine
January 11, 2030 - January 1, 2006B.S. in Computer Science and Information Technology Design & Management at Kyiv National University of Construction and Architecture
January 11, 2030 - May 1, 2026Qualifications
Industry Experience
Software & Internet, Financial Services, Professional Services, Media & Entertainment, Non-Profit Organization, Education
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Hire a Full Stack Developer
We have the best full stack developer experts on Twine. Hire a full stack developer in Romeoville today.