The original developer is gone
The person or team who built the application left, and nobody remaining fully understands how it works.
Software Rescue & Application Modernization
Inherited software nobody understands?
I help businesses recover abandoned, undocumented, and aging applications then make them stable, understandable, and maintainable.
13+ years building and modernizing business software
ReactTypeScriptC# / .NETSQL ServerAzure
Application Takeover Snapshot
Example software rescue assessment
Needs Attention
Takeover Readiness
58/ 100
Detected Architecture
Frontend
Vue.js
API
ASP.NET Core
Database
SQL Server
Initial Findings
Deployment undocumented
Outdated application dependencies
Database structure identified
Authentication flow located
Recommended next step
Stabilization & documentation
When software becomes a business problem
The application works.Until someone has to change it.
Software rarely becomes difficult overnight. Knowledge disappears, dependencies age, documentation falls behind, and eventually the business is left depending on a system nobody feels comfortable touching.
Every change feels risky
The application still runs, but even small updates can trigger unexpected problems somewhere else.
The technology is years behind
Frameworks, runtimes, dependencies, and infrastructure have fallen behind and upgrades keep getting postponed.
Documentation doesn't exist
Deployment steps, integrations, database knowledge, and important architectural decisions were never written down.
You inherited the application
An acquisition, contractor, agency, or previous employee left you responsible for software your team didn't build.
AI got you started, but now you're stuck
An AI-assisted prototype became real business software and now needs experienced engineering to make it reliable and maintainable.
A full rewrite is not always the answer.
The first step is understanding what you have, what is actually at risk, and what can be repaired or modernized without replacing the entire system.
How I can help
Start by understanding the problem.Then fix the right things.
Whether you inherited an unfamiliar application, need to modernize an aging system, or want to build something new, the goal is the same: make the technology support the business instead of becoming another source of risk.
Best place to start
Software Rescue
Take control of software nobody feels comfortable touching.
I assess inherited, abandoned, undocumented, or difficult to maintain applications so you can understand how the system works, where the real risks are, and what should happen next.
Understand an inherited or abandoned codebase
Identify architecture, dependencies, and integrations
Find deployment, documentation, and maintenance risks
Determine what should be repaired, modernized, or replaced
Application Modernization
Improve aging software without automatically rewriting everything.
Modernize frontend, backend, authentication, APIs, infrastructure, and development workflows while preserving the parts of the system that still work.
Explore ModernizationCustom Software & AI Systems
Build tools around real operational problems.
From workflow automation to private AI knowledge systems, I can help turn repetitive processes and difficult-to-find company information into maintainable software.
Discuss a ProjectHow Software Rescue Works
Understand first.Make decisions second.
You should not have to commit to a major rewrite before anyone understands the application. Software Rescue starts with a focused assessment designed to give you enough information to make an informed decision.
The assessment stands on its own.
You are not required to hire me for the implementation. The goal is to leave you with useful technical information even if another developer or team performs the work.
01
Tell me what happened
We start with the situation, not the source code. You tell me what the application does, what changed, what your team knows, and where you're getting stuck.
02
I assess the system
I review the application architecture, dependencies, deployment process, data layer, integrations, documentation, and the areas most likely to create risk.
03
You get a clear report
You receive an understandable assessment of what you have, what needs attention, what can wait, and where important knowledge or documentation is missing.
04
Decide what happens next
With the system understood, you can repair it, modernize it, replace part of it, hand it to another team, or have me help with the next phase.
Software Rescue Assessment
Start with a defined technical assessment.
For smaller applications, assessments will start at $750. Scope and pricing are agreed upon before any work begins.
Engineering Experience
More than a decade inside real software systems.
I've spent more than 13 years building, maintaining, and modernizing software used by real businesses. That includes working inside existing systems where replacing everything from scratch simply wasn't an option.
The work often starts with understanding what already exists, identifying the parts that matter most, and improving the system without disrupting the people who rely on it.
13+
Years of professional software engineering
20+
Legacy application pages modernized
6+
Operational dashboard widgets delivered
Legacy Application Modernization
Migrating existing applications incrementally while preserving the business workflows and backend systems they already depend on.
Full-Stack Engineering
Working across React and TypeScript frontends, C#/.NET services, REST APIs, application architecture, and complex business logic.
Real-Time Applications
Building operational interfaces and real-time workflows with SignalR, AG Grid, FlexLayout, and data-intensive user experiences.
Data & Backend Systems
Designing and maintaining SQL Server solutions, data-processing workflows, APIs, and location-aware business logic.
Authentication & Security
Working with authentication, authorization, MFA, Azure Key Vault, application secrets, and secure enterprise workflows.
Cloud & Delivery
Experience with Azure, CI/CD, Azure DevOps, deployment workflows, and the operational side of keeping business software running.
Technologies I've worked with
ReactTypeScriptVue.jsAngularC# / .NETASP.NET CoreSignalRSQL ServerAzureREST APIsAG Grid
Selected Engineering Work
Experience solving the kinds of problemsthat are difficult to replace overnight.
Much of my career has involved working inside existing business systems: understanding what is already there, modernizing it safely, and solving problems without disrupting the workflows people depend on.
Featured Case Study
Legacy Frontend
Vue.js
Modern Architecture
React + TypeScript
Application Modernization
Modernizing a legacy trading application without replacing the systems behind it.
Modernized more than 20 application pages from Vue.js into a React and TypeScript architecture while continuing to work with existing backend services and operational workflows.
The Challenge
Improve and modernize a production application incrementally rather than attempting a disruptive full-system rewrite.
The Work
Frontend migration, reusable architecture, operational dashboards, real-time updates, authentication workflows, and integration with existing services.
Technologies
ReactTypeScriptVue.jsAG GridFlexLayoutSignalR.NET
Logistics & Geospatial Systems
Location-aware timezone resolution for logistics operations.
Built backend logic that determines timezone from geographic location using SQL Server Geography and timezone polygon data, allowing operational times to be interpreted correctly across locations.
SQL ServerGeography.NETAPIs
View case studyEnterprise Software
Secure document-processing and storage workflows.
Worked on enterprise healthcare applications involving document processing, secure storage, APIs, cloud services, authentication, and modern web interfaces.
Angular.NET CoreAzureREST APIsKey Vault
View case studyProfessional work is described at a high level. Proprietary source code, internal business logic, customer information, and other confidential details are intentionally omitted.
About Me
I've spent my career building software.A lot of it already existed before I got there.
I'm David Southwood, a senior software engineer with more than 13 years of professional experience building, maintaining, and modernizing business applications.
I've worked across React, TypeScript, Vue, Angular, C#/.NET, SQL Server, Azure, APIs, real-time systems, and complex operational software. The part I enjoy most is understanding how a system actually works and finding a practical way to make it better.
13+ years in software engineering
Professional experience across frontend, backend, APIs, databases, cloud services, and business-critical applications.
Comfortable inside existing systems
Much of my work has involved understanding software I didn't originally build and improving it without disrupting the business.
You work directly with me
No agency handoff. I handle the technical assessment, recommendations, communication, and implementation work directly.
Available for consulting, contract engagements, and the right senior engineering opportunity.
If you're dealing with a difficult application—or building the team responsible for one—I'm happy to talk.
Start With a Conversation
Not sure what condition your application is actually in?
Tell me what you're dealing with. You don't need to know whether the answer is repair, modernization, replacement, or something else before reaching out.
What happens when you reach out?
Tell me what the application does and what problem you're experiencing.
Don't send source code, passwords, API keys, or other confidential material through the initial contact form.
I'll determine whether the project looks like something I can help with and what the appropriate next step is.
If an assessment makes sense, scope and pricing are agreed upon before work begins.
Software Rescue Assessments
$750starting price
Intended for smaller applications. Larger or more complex systems are scoped separately before work begins.