End-of-life & dependency audit
We inventory versions, unsupported libraries, and security exposure, so you see exactly what has aged out and why it matters.
App Modernization · Framework & Stack Migration · AI-First · Results-Driven
Framework & Stack MigrationOff End-of-Life Tech, Onto Supported Ground
Short answer: Framework and stack migration moves an application off an end-of-life language, framework, or runtime and onto a supported, modern one, without changing what the app does for users. It is chosen when a version stops receiving security patches, hiring for the old stack gets hard, or new features are blocked by outdated dependencies. Zen in Tech migrates in phases with tests around the behavior first, so the switch does not change results. Scope is typical and confirmed on a free call.
Same product, a stack that still gets security patches
Framework and stack migration is the work of porting an existing app from an unsupported technology to a current one, for example an old .NET Framework, AngularJS, Python 2, or a long-abandoned PHP version, while keeping the features and behavior your users already rely on.
The goal is a boring result: the app does exactly what it did, but now on a stack that receives security updates, that your team can hire for, and that new libraries actually support. We protect that outcome with tests written around current behavior before we move a line.
Across 20+ years and 700+ projects our in-house Houston team has run migrations end to end. The engineers who characterize the old code are the ones who port it, verify parity, and support the modern stack afterward.
What we cover
What a framework & stack migration covers
Target stack selection
We recommend a supported language, framework, and runtime that fit your team and roadmap, not just the newest option.
Behavior-first characterization tests
We wrap the current behavior in tests before porting, so the migrated app can be proven to produce identical results.
Incremental, module-by-module port
We migrate in slices with the old and new running together where possible, avoiding a risky all-at-once rewrite.
API & dependency modernization
We replace deprecated libraries and calls with maintained equivalents, clearing the blockers to future features.
Tooling, build & CI upgrade
We modernize the build pipeline and CI/CD alongside the code, so shipping on the new stack is fast and repeatable.
Services
How a stack migration works with us
From an end-of-life audit to a fully supported stack, here is how a framework or language migration runs at Zen in Tech.
1. Audit & version inventory
We map every language, framework, and library version, flag what is unsupported, and score the security and upgrade risk.
2. Target stack & migration plan
We choose the destination stack with you and sequence the port into phases with clear checkpoints and rollback points.
3. Safety net of tests
We add characterization and regression tests around current behavior so parity can be measured, not assumed.
4. Incremental port
We migrate module by module, running old and new side by side where feasible and validating each slice against the tests.
5. Cutover & parity verification
We switch traffic to the modern stack in stages, confirming outputs match before the old version is retired.
6. Support on the new stack
Post-migration we keep dependencies current, monitor, and extend the app on a care plan, now that new features are unblocked.
Tools & platforms
Stacks we migrate to (and from)
The exact toolset depends on your goals — these are the platforms we use most, and we work with whatever your team already relies on.
Audit & analysis
Backend targets
Frontend targets
Common sources
.NET FrameworkAngularJSPython 2legacy PHPjQuery
Testing & parity
Build & CI/CD
Chosen per project — not a fixed menu. Have a preferred tool or platform? We’ll work with it.
Built to last
Secure, Accessible & Built to Last
We build on modern, well-supported frameworks with security and accessibility baked in — dependency hygiene, input validation, HTTPS and WCAG-minded UI — so your product is safe and usable from day one.
You own all the code and assets. Everything ships with documentation and a clean handover, so your team (or ours) can maintain and extend it without lock-in.
Who we work with
Industries We Build For
20+ years across sectors — in Houston and internationally.
Transparent pricing
Estimate your project in seconds
Pick what you’re building for an indicative range, then request an exact quote. No email wall.
Simple prices for typical tasks
- Audit & planfrom $3k
- Replatformfrom $18k
- Full rebuildfrom $30k
- Care planfrom $1k/mo
Proof
700+ projects, 20+ years
See the products and growth work we’ve shipped across industries — and request a case study relevant to yours.
How we work
Fixed scope. Sprints. Working software.
- 01
Scope & fixed estimate
A short discovery call turns your idea into a clear spec and a firm range — free.
- 02
Design & architecture
UX, data model and stack chosen for your scale, not ours.
- 03
Build in sprints
Working software every 1–2 weeks — you see progress, not promises.
- 04
Launch & scale
We ship, measure and keep improving with care plans.
FAQ
Framework & stack migration: frequently asked questions
How much does a framework or stack migration cost?
Cost depends on the size of the codebase, how far behind the current stack is, and how much behavior has to be verified for parity. We scope it after a dependency audit and confirm the exact number on a free call.
What is a framework and stack migration?
It is porting an application from an end-of-life language, framework, or runtime to a supported, modern one while keeping what the app does for users unchanged. Unlike a rebuild it preserves the design and features; the point is a maintained, secure foundation.
How long does a migration take?
Timeline scales with codebase size and how tangled the dependencies are. We migrate module by module so value and reduced risk arrive along the way. A realistic staged timeline follows the audit.
Will the app behave differently after migrating?
The goal is identical behavior. We write characterization tests around current results before porting and verify each migrated slice against them, so users should not notice a functional change, only better performance and security over time.
Do we have to migrate the whole stack at once?
No, and we usually advise against it. We port in slices, run the old and new side by side where feasible, and cut over in stages, which keeps a fallback available and de-risks the switch.
Can you migrate off a specific old framework we are stuck on?
Usually yes. We regularly move apps off .NET Framework, AngularJS, Python 2, legacy PHP, and old jQuery front ends. We confirm feasibility and the best target during the audit.
Do you migrate stacks for businesses outside Houston?
Yes. We are based in Houston but run framework and stack migrations for clients across Texas, the USA, and internationally, handled remotely by our in-house team.
Do you work with Houston businesses in person?
Yes, Houston is our home market. Our office is at 9800 Richmond Ave in the Westchase / Energy Corridor area, and we are glad to meet local clients to plan the migration in person.
Ready to get off end-of-life tech for good?
Book a free call and we will audit your stack, flag what has aged out, and lay out a phased migration to a supported, modern foundation. One in-house Houston team handles the audit, the port, the parity testing, and the support after.
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