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Hi, I’m Mark Buynoski, a senior software developer with over two decades of experience delivering enterprise-grade applications. I specialize in modernizing legacy systems, building scalable APIs, and leading cross-functional teams in agile environments. I’m passionate about clean architecture, mentoring developers, and using technology to improve business outcomes. I’ve driven projects across government, energy, and financial sectors, from migrating legacy .NET apps to NodeJS/NestJS stacks to designing data-heavy solutions and automated test frameworks, like Playwright. I enjoy working in environments where innovation is celebrated and development culture is collaborative and positive. I appreciate your time and consideration. Mark _Phone details not available. Sign in: https://www.twine.net/signup_ _Email not available. Sign in: https://www.twine.net/signup_…Hi, I’m Mark Buynoski, a senior software developer with over two decades of experience delivering enterprise-grade applications. I specialize in modernizing legacy systems, building scalable APIs, and leading cross-functional teams in agile environments. I’m passionate about clean architecture, mentoring developers, and using technology to improve business outcomes. I’ve driven projects across government, energy, and financial sectors, from migrating legacy .NET apps to NodeJS/NestJS stacks to designing data-heavy solutions and automated test frameworks, like Playwright. I enjoy working in environments where innovation is celebrated and development culture is collaborative and positive. I appreciate your time and consideration. Mark _Phone details not available. Sign in: https://www.twine.net/signup_ _Email not available. Sign in: https://www.twine.net/signup_

Mark Buynoski

Full Stack Developer, Web Developer, Back-End Developer, +2

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Hi, I’m Mark Buynoski, a senior software developer with over two decades of experience delivering enterprise-grade applications. I specialize in modernizing legacy systems, building scalable APIs, and leading cross-functional teams in agile environments. I’m passionate about clean architecture, mentoring developers, and using technology to improve business outcomes. I’ve driven projects across government, energy, and financial sectors, from migrating legacy .NET apps to NodeJS/NestJS stacks to designing data-heavy solutions and automated test frameworks, like Playwright. I enjoy working in environments where innovation is celebrated and development culture is collaborative and positive. I appreciate your time and consideration. Mark _Phone details not available. Sign in: https://www.twine.net/signup_ _Email not available. Sign in: https://www.twine.net/signup_…Hi, I’m Mark Buynoski, a senior software developer with over two decades of experience delivering enterprise-grade applications. I specialize in modernizing legacy systems, building scalable APIs, and leading cross-functional teams in agile environments. I’m passionate about clean architecture, mentoring developers, and using technology to improve business outcomes. I’ve driven projects across government, energy, and financial sectors, from migrating legacy .NET apps to NodeJS/NestJS stacks to designing data-heavy solutions and automated test frameworks, like Playwright. I enjoy working in environments where innovation is celebrated and development culture is collaborative and positive. I appreciate your time and consideration. Mark _Phone details not available. Sign in: https://www.twine.net/signup_ _Email not available. Sign in: https://www.twine.net/signup_

Available to hire

Hi, I’m Mark Buynoski, a senior software developer with over two decades of experience delivering enterprise-grade applications. I specialize in modernizing legacy systems, building scalable APIs, and leading cross-functional teams in agile environments. I’m passionate about clean architecture, mentoring developers, and using technology to improve business outcomes.

I’ve driven projects across government, energy, and financial sectors, from migrating legacy .NET apps to NodeJS/NestJS stacks to designing data-heavy solutions and automated test frameworks, like Playwright. I enjoy working in environments where innovation is celebrated and development culture is collaborative and positive.

I appreciate your time and consideration.
Mark
Phone details not available. Sign in: https://www.twine.net/signup
Email not available. Sign in: https://www.twine.net/signup

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Work Experience

Senior Developer at Transport4, LLC

January 1, 2025 - October 15, 2025

Modernized core systems by migrating legacy Microsoft applications to the NodeJS/NestJS stack; led development of the primary Billing Processing API using Node.js/TypeScript and MS SQL Server, with Docker. Designed and standardized an automated Playwright-based testing framework and delivered QA training. Built a customer onboarding tool to streamline data ingestion into SQL Server and led knowledge-sharing sessions on AWS services and advanced topics.

Senior Developer at Pipeline, Controls & Services, Inc

January 1, 2019 - October 15, 2025

Supported and modernized technology initiatives for major oil pipeline clients including Colonial Pipeline and Kinder Morgan. Led UI development for Colonial Pipeline’s new accounting system; built a data replication process for Kinder Morgan’s SCADA systems leveraging SQL Server Replication and SSRS; provided ongoing engineering support for existing enterprise systems.

Senior Engineer at Swift Exchange, LLC

January 1, 2014 - October 15, 2025

Designed data-driven and web-based solutions; built a data warehouse solution for payment data extraction, transformation, and storage using Visual Studio 2012, SSIS, Entity Framework, and SQL Server 2008. Developed MVC.NET and jQuery-based loyalty applications to enable business users to manage accounts, data, and reporting dashboards.

Senior Developer at Georgia Department of Revenue

January 1, 2013 - October 15, 2025

Designed, developed, and supported enterprise .NET solutions serving nearly 59 million taxpayers. Delivered real-time dashboards for the Processing Center, built a Tax Inquiry mobile app, and developed e-hire reporting tools to track employment lifecycle events.

Technical Lead Consultant / Applications Developer at Magenic Technologies, Inc

January 1, 2006 - October 15, 2025

Consulted on analysis, design, and implementation of Microsoft-based solutions; participated in client sales, proposals, and technical delivery under tight deadlines. Improved and modernized reporting systems, mentored developers on .NET technologies, and served as technical lead for multiple engagements (e.g., Commonwealth Business Media).

Senior Developer at Tallan, Inc.

January 1, 2005 - October 15, 2025

Designed and implemented secure, efficient .NET solutions for enterprise clients; developed web- and Windows-based systems for Estee Lauder and XL Capital, including data access layers and lifecycle management of complex entities.

.NET ASP Lead Developer at Meta Health Technology

January 1, 2004 - October 15, 2025

Gathered requirements, designed and developed medical facility systems for managing sensitive patient data; led full-stack development across SQL Server 2000, C#, and ASP.NET; oversaw project planning, budgets, and deliverables.

Senior Engineer at iXL, Inc.

January 1, 2002 - October 15, 2025

Developed and implemented Microsoft-based enterprise solutions for major clients; served as Microsoft Lead for the New York office and trained junior developers. Built XML/XSLT solutions for error handling and validation; developed VB6/.NET components for Lloyds of London, Deutsche Bank, Chase Manhattan Bank, and other clients.