Senior .NET Full Stack Developer

John Brancaleon

Senior .NET Full Stack Developer

Naperville, IL 630-***-**** ***********@*****.*** linkedin.com/in/JohnBrancaleon

PROFESSIONAL SUMMARY

Senior .NET Full Stack Developer with 10+ years of enterprise experience in C#, ASP.NET, ASP.NET Core, MVC, Web API, and SQL Server. Specialist in modernizing legacy .NET Framework applications (4.0/4.6/4.8 to .NET Core and current .NET) with React front ends, RESTful APIs, and CI/CD automation. Delivered systems in banking and distribution serving 10,000+ users and millions of daily transactions. Experienced in Agile delivery, code reviews, production support, and cross-team collaboration, plus secure authentication (OAuth2/JWT) and PKI integration.

TECHNICAL SKILLS

Languages & Frameworks: C#, .NET Framework 4.x, .NET Core / .NET 10, ASP.NET, ASP.NET Core, MVC, Web API, LINQ, Entity Framework, ADO.NET

APIs & Services: RESTful APIs, Web API, backend services, OAuth2, JWT, third-party integrations, JSON

Front-End: React, JavaScript, jQuery, AJAX, HTML5, CSS, Bootstrap

Databases: SQL Server, stored procedures, query optimization, indexing, performance tuning

DevOps & Tools: CI/CD, Azure DevOps, GitHub, Visual Studio, VS Code, Postman, PowerShell, AWS EC2

Practices: Agile/Scrum, code reviews, unit testing, SOLID, design patterns, production support, root cause analysis, technical documentation

PROFESSIONAL EXPERIENCE

Application Modernization & DevOps Engineer — Collabera LLC (Contract)2025 – Present

Client: Bank of America

•Modernized legacy .NET applications from .NET 4.6/4.8 to current .NET (Core) with React front ends, improving performance, maintainability, and security.

•Enhanced internal applications with OAuth2/JWT authentication and certificate-based trust for secure API communication.

•Automated enterprise Certification Authority server builds using PowerShell and C#/.NET, cutting provisioning time by 35%.

•Built internal automation tools that reduced manual work and improved audit readiness.

•Collaborated with security, infrastructure, and platform teams to integrate PKI services (CA, SCEP/NDES, OCSP) into CI/CD pipelines.

Senior Full Stack Developer — Vensure Employer Services2024 – 2025

•Designed and developed enterprise applications with .NET Core and ASP.NET MVC supporting 10,000+ users.

•Built and maintained RESTful APIs integrated with SQL Server and cloud-enabled environments.

•Reduced deployment failures by 35% through CI/CD automation and DevSecOps practices.

•Conducted code reviews to enforce secure coding standards and compliance requirements.

Senior Full Stack Engineer — Cognizant / JP Morgan Chase2021 – 2023

•Developed distributed backend services in C# and .NET Core processing millions of financial transactions daily.

•Optimized SQL Server performance, reducing critical query latency by 40%.

•Participated in governance and design reviews supporting secure enterprise modernization.

Senior Full Stack Developer — KeHE Distributors2019 – 2020

•Led migration of applications from .NET 4.0 to .NET Core 2.0 on AWS, and built EC2-hosted microservices supporting nationwide order processing.

•Increased throughput by 50% through event-driven architecture and REST API optimization.

EDUCATION

Bachelor's Degree in Computer Science — Bethel College, 1984

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