Jonathan Wesley
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Senior .NET / React Engineer for Reliable Business-Critical Software

I help teams stabilize, extend, modernize, test, and support C#/.NET, REST API, SQL Server, and React/TypeScript systems without risky rewrites.

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10+ years of experience across enterprise applications, backend services, production support, automated testing, and legacy modernization.

React / TypeScript
.NET Services
REST APIs
SQL Server
Automated Testing
Production Support
Legacy Modernization

Useful when your software needs experienced hands, not a risky rewrite.

  1. 01

    Existing .NET app needs fixes or modernization

  2. 02

    API or SQL Server workflow is blocking business operations

  3. 03

    Production issues keep resurfacing

  4. 04

    Releases feel risky because test coverage is thin

  5. 05

    Internal tools are slow, brittle, or hard to maintain

  6. 06

    Your agency needs senior overflow help

  7. 07

    Your team needs someone who can ramp into an existing codebase

Services

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Legacy .NET Rescue

Stabilize and modernize existing .NET systems without forcing a risky rewrite.

API & Integration Buildout

Design or extend REST APIs, integrations, and service boundaries.

SQL Server-Backed Internal Tools

Improve operational workflows that are stuck in spreadsheets or brittle applications.

Test Coverage & Release Confidence

Strengthen automated coverage around important user journeys and reduce release risk.

React/TypeScript Product Slice

Build a focused product feature, prototype, admin dashboard, or local-first tool.

Selected Work

View All Case Studies
01

National insurance provider

Strengthening Reliability and Test Coverage for a High-Volume Insurance Platform

Backend, full-stack, automated testing, and production-support contributions for complex quote, policy, and customer-facing workflows.

  • C#/.NET
  • ASP.NET Core
  • REST APIs
  • React
  • TypeScript
  • SpecFlow/Gherkin
02

Vehicle service contract company

Supporting .NET and SQL Server Workflows for Contract, Pricing, and Customer Operations

Senior backend and full-stack support for pricing, contract management, customer portals, and internal business operations.

  • C#/.NET Core
  • ASP.NET Core
  • REST APIs
  • Entity Framework
  • SQL Server
  • Production support
03

Financial services, healthcare, and enterprise organizations

Modernizing Legacy .NET and VB Systems for Financial, Healthcare, and Enterprise Clients

Contract engineering across older VB6, VB.NET, and monolithic .NET systems that still supported important business operations.

  • C#/.NET
  • .NET Core
  • VB6
  • VB.NET
  • SQL Server
  • JavaScript

Independent Product Spotlight

TableBuddy

A local-first React/TypeScript app for tabletop game masters who need fast session notes, NPC context, and cleaner recaps without adding table friction.

View ProjectVisit TableBuddy
TableBuddy campaign screen showing local backup and restore controls

Practical, maintainable, business-aware engineering.

I work best inside real systems with real operational constraints. The goal is useful progress that teams can support after the engagement ends.

  1. 01

    I start by understanding the workflow and failure points.

  2. 02

    I look for the smallest safe improvement before proposing a rewrite.

  3. 03

    I document what changed and why.

  4. 04

    I communicate tradeoffs clearly.

  5. 05

    I write code with maintainability and production support in mind.

  6. 06

    I am comfortable collaborating with product, QA, business, and engineering teams.

Open to

  • Freelance projects
  • Part-time contracts
  • Agency overflow
  • Technical audits
  • Remote or St. Louis-area hybrid work

Need help with an existing .NET, API, SQL Server, or React system?

Send a short note about the system, the issue, and what kind of help you need. I am open to freelance projects, part-time contract work, and agency overflow support.

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