Legacy .NET & SQL Server modernization
Modernize the .NET system your business already depends on.
We incrementally modernize legacy .NET and SQL Server applications, preserving business logic while evolving systems with modern APIs, cloud infrastructure and practical AI - without defaulting to risky big-bang rewrites.
- started
- ASP.NET Forms with MySQL backend (10 years old)
- moved
- Database → microservices → frontend
- landed
- .NET Core 8 · PostgreSQL · React · AWS · REST APIs
Start here
What's Your Software Challenge?
My legacy application is difficult to maintain.
Request a Legacy System AssessmentI need to build a new business application.
Discuss Your ProductI need to connect existing systems.
Discuss Integration RequirementsI want to add AI to existing software.
Discuss Your AI Use CaseI need additional engineering capability.
Discuss Engineering RequirementsWhat we do
Four things, and the systems we do them to.
Every engagement starts the same way: a scoped assessment of the system as it actually is - not as the documentation claims.
Modernize
Improve a legacy .NET, SQL Server or business-critical application without assuming a risky full rewrite.
Explore Modernization- Legacy .NET Modernization
- Application Rescue
- Enterprise Application Modernization
- Cloud Modernization
Build
Create SaaS products, business applications, ERP/CRM platforms and operational systems.
Explore Business Applications- Custom Business Applications
- SaaS Product Development
- ERP & CRM Development
- Mobile Applications
Integrate
Connect legacy software, APIs, ERP, CRM and third-party platforms.
Explore Integration Services- API Development
- API Integration
- ERP/CRM Integration
- Legacy System Integration
Automate
Add practical AI, document intelligence, workflow automation and controlled AI agents.
Explore AI Solutions- AI for Existing Applications
- AI Automation
- Document Intelligence
- AI Agents
About us
Fifteen years in other people's codebases.
Offbeat Software Solutions has been building and maintaining business software since 2011. Most of what we do isn't greenfield - it's picking up a system someone else built, figuring out why it's built the way it is, and improving it without breaking what already works. That's meant a lot of time in ASP.NET and SQL Server codebases, and more recently, working out where AI actually earns its place in an existing workflow instead of being bolted on because it's trendy. Every engagement starts under NDA, and the code stays yours.
Proof
Custom software development case studies
Karneyium
Choosing where to run a clinical trial is a slow, manual process that can add months and millions of dollars to a drug's path to market. Research teams struggle to make data-driven decisions about optimal trial locations without unified access to patient demographics, healthcare infrastructure, and historical recruitment data.
Fit
Who we work best with
We work with businesses across every industry, not one vertical or one technology. What our best-fit clients have in common is usually one of these four situations.
Running a business-critical .NET or SQL Server application
The system works, but it's become difficult to maintain, extend, or scale, and a full rewrite feels too risky.
Needing a new business application built
A SaaS product, internal tool, or ERP/CRM platform that doesn't exist yet and needs to be built from the ground up.
Needing systems connected
Data and workflows are stuck in silos across legacy software, APIs, or third-party platforms that need to talk to each other.
Wanting to add AI to existing software
Practical AI, document intelligence, or workflow automation layered onto systems you already run - not a replacement for them.
Testimonials
What clients say
Great attention to detail and managing the DevOps portion of the platform. Grew from a small project to an engagement for years with lots of different technologies and solutions.
Good work ethics and able to meet deadlines. Impressed with the quality of communication.
As always, another great job completed. We'll be in touch for the next project. Thanks again for all your help. Alan from Ireland.
Team are super knowledgeable and skilled in many different technologies. Top quality work and always asking clarifying questions in order to get it right the first time. Highly recommended!
Excellent provider. Great communication skills in addition to programming and project management. Successfully completed the project. Highly recommended.
Finish the project on time. very attended all the time. See you in the next project.
Team was a Great Pleasure to Work with, Very Respectful, Considerate, and Very Attentive to My Project Requests.
Process
How a project actually moves from scope to production.
Discovery & Scoping
We map the system's functional logic, technical constraints, and integration points under NDA before we commit to an approach or a number.
Architecture & UI/UX
We plan the data model and interface around how the application is actually used, with an eye on what breaks first as load or scope grows.
Agile Development
Short, reviewable sprints in .NET Core, Next.js, and Node.js, with AI-assisted tooling used where it genuinely speeds things up, not by default.
Quality Assurance
Automated coverage (Cypress, NUnit) plus manual review before anything reaches staging.
CI/CD Deployment
Releases go out through an automated pipeline to AWS or Azure, so shipping doesn't depend on someone remembering a manual checklist.
Long-Term Evolution
After launch, we keep tuning performance and picking up the follow-on work that discovery couldn't have caught - most systems need it.
FAQ
Frequently asked questions
How much does a project cost?
It depends on what we find during discovery - modernizing a decade-old ASP.NET application is a different estimate than building a new product from scratch. We don't put a number on it until someone has actually looked at the system or the spec.
Who owns the code and IP when the project is done?
You do. Full ownership of the code and any IP built during the engagement transfers to you - nothing gets held back or reused elsewhere.
What happens if the timeline slips?
We tell you as soon as we know, not at the deadline. Most slippage on this kind of work comes from finding something in the existing system that wasn't visible going in - when that happens we explain what changed and work out scope or timeline together, rather than quietly cutting corners to hit the original date.
What does "NDA-ready" actually cover?
Everything - the codebase, architecture discussions, credentials, and any business logic we're exposed to along the way. We sign before we look at anything, not after.
How do we work with a team based in Punjab, India across time zones?
We keep a block of overlapping hours for calls and pairing, and everything else - code reviews, status updates, decisions - happens async in writing so progress doesn't depend on catching someone awake.
How do you migrate a legacy system while limiting disruption?
In phases, not one cutover. The old and new systems typically run side by side for a stretch, we validate the new one against real traffic and data, and only redirect once it's actually holding up - rather than betting everything on a single switch with no way back.
What happens after I submit the estimate form?
Someone reviews what you sent and responds within 48 hours - usually with a few follow-up questions first, since a real estimate needs more than a one-paragraph form.
Start with the system, not a sales call.
Tell us what the system does today and what's getting in the way. We'll give you a straight answer on whether it needs modernizing, rebuilding, or just the right integrations.