0:16
“I very much respect the knowledge that you have. You have a lot of things, just in our few communications, that no one else has mentioned. No one else has even made me think about them.”
Legacy Modernization
Replace the old system while it keeps running
We take aging codebases onto a supported, maintainable stack without betting the company on a rewrite. The old system keeps running while we replace it one proven seam at a time.
Why choose us for legacy modernization?
A system that still pays the bills gets replaced one seam at a time, with a test that proves each move and a rollback that has been rehearsed.
Incremental migration plan
A seam-by-seam roadmap keeps the current system running while modern capabilities replace it in production, so your product team keeps shipping through the whole programme.
Characterization test harness
Golden-master and contract tests capture what the legacy system actually does before we change its internals, so a changed output is caught by an alarm rather than by a customer.
Supported modern stack
End-of-life frameworks, runtimes and build tooling are replaced with a maintainable baseline your team can hire for, chosen for operational fit rather than novelty.
Safe data migration
Backfills, dual writes, shadow reads and reconciliation checks run before any old data path is retired, so the new store is proven consistent before it becomes authoritative.
Stable integration boundaries
Adapter APIs and anti-corruption layers stop new services inheriting old-system assumptions, so each capability you move out is genuinely free of the one it left.
Reversible cutovers
Feature-flagged releases, parallel-run windows, observability and a rehearsed rollback go with every migration step, so no cutover is a one-way door.
What we build in legacy modernization
The moves an aging system needs, each made while the old path still serves traffic.
Monolith to services
Capabilities extracted into separately deployable services, only where the operational case is real.
- Facades in front of each capability before extraction
- Contracts and data ownership agreed per service
- Both paths kept running until the switch is proven
Framework upgrades
End-of-life frameworks and runtimes brought onto supported versions, one jump at a time.
- Characterization tests written before the first jump
- Dependencies and deprecated APIs replaced along the way
- Each version step deployed and verified in production
Database migrations
Schema and engine moves reconciled before the old store is retired.
- Backfills run in batches while the system stays live
- Dual writes and shadow reads to prove parity
- Reconciliation reports before the cutover is called
UI replatforming
Legacy front ends moved onto a modern framework, one screen at a time.
- Routes that switch per page between old and new
- Shared session, auth and styling across both stacks
- Design system components reused as screens migrate
Strangler-fig rewrites
A new system grown around the old one, seam by seam.
- A routing layer that decides which system answers
- Each seam taken over and verified before the next
- Legacy paths retired once nothing depends on them
On-prem to cloud
Phased moves to AWS, GCP or Azure with an explicit cutover plan.
- Dependency mapping across servers, jobs and integrations
- Dual-running with data transfer and validation
- Cutover rehearsed, with a way back if needed
Recent products we shipped
Our most recent case studies. Each result is the one its own case study reports, in its own words.
30+ SKUs scanned into one Shopify draft order; the old version choked on large ones.
Draft Deputy
Shopify · Micro-SaaS
1,000+ skincare formulas resolved from a 60-second phone scan in 55+ San Pablo pharmacies, before the customer leaves the store.
2250
A.I · Custom Web App
3.5K students stayed online while a Lovable-built front end was mapped onto the live LMS.
Squid Academy LMS
SaaS · Custom Web App
Non-marketers launch Meta and TikTok campaigns from one plain form, and read both platforms’ results in one view instead of two ad managers.
AI Agent for Meta and TikTok Ads
MVP · SaaS
How we build legacy modernization
Four stages, from mapping the system to removing the dead code once the new path owns the traffic.
Map the system and the risk
We audit architecture, dependencies, data ownership, deployment paths, failure modes, and the areas nobody wants to touch.
Build the safety net
Characterization tests, observability, and stable boundaries go in before migration work starts. We need to detect changed behaviour, not hope for it.
Migrate one seam at a time
Each capability moves behind a facade, runs alongside the legacy path, and proves itself on real traffic before cutover.
Cut over and remove dead code
After reconciliation and a rollback rehearsal, traffic moves to the new path and the old one is decommissioned so the system genuinely gets smaller.
- See our full process
What clients say after the build
Real client reviews, every one checkable at source.
AI Change Management 
0:10“I find him very nice to work with and he actually delivers a very good quality. So I am really happy with him.”
Restaurants Insightful 0:09“The confidence that you're building with me the full product is what I want to go with.”
Self-image 0:07“You guys seem switched on and like you know what you're doing. I've got a good feeling about it.”
GoldenEye 0:05“You guys take a lot of pride and ownership in the work.”
“The team treats our roadmap like their own. Every standup felt like working with our own engineers, not an outside vendor.”
PixelFox “They shipped the production version of what our previous agency had been promising for nine months, without the weekly excuses.”
“They told us what NOT to build. That single conversation re-shaped six months of roadmap and saved us a lot of money.”
NDA - Signed “I had a large project built that needed a very specific understanding and the project was executed perfectly. Great design, great code, no bugs and anything I needed was done incredibly professionally. I would highly recommend and I will definitely be coming back with my…”
$4,000 and above · 11 monthsVerified client review
NDA - Signed “We approached several sellers in our search to get an app developed for our Shopify store. I had a very clear idea in my mind what we wanted and, through [their] expert questioning, [they] absolutely 'got it'. This was further proved through delivery of a…”
$1,500-$2,000 · 4 weeksVerified client review
NDA - Signed “We're working on a Shopify app that retrieves book data from our API and helps online stores and booksellers create book listings faster. This time, we needed to improve the app design and fix functionality issues. In general, we're satisfied with the service and plan…”
$400-$600 · 3 weeksVerified client review
NDA - Signed “This was a special request where we needed to rush this development. [They] complied and finished everything at the agreed time, and even worked until 2AM [their] local time in order to finish this on time. [They] went the extra mile for us with this…”
Verified client review
NDA - Signed “[They were] very patient as we figured out exactly what we needed our app to do. [They were] able to get all the functionality we required, communicated well, and [were] upfront about the cost. We'll definitely be coming back for future projects!”
Verified client review
NDA - Signed “Absolutely fantastic work. This was a tricky app, and [they] did great work. [They] really know [their] way around Shopify and the process for developing a Shopify app, which was a great help to me! [They're] motivated and committed, and delivered a very high-quality app.…”
Verified client review
NDA - Signed “I am very pleased to have worked with [them]! [They were] very detailed and delivered me perfection in an app! I look forward to working with [them] again!”
$3,000-$4,000 · 2 monthsVerified client review
NDA - Signed “Amazing service. Amazing time. Took all input and made the site great even with minor changes along the way. Will certainly try to use again if I'm lucky enough to have [them] work with me again. Thank you for everything.”
Verified client review
NDA - Signed “Very fast and thorough. [They] did exactly what I asked and then went the extra mile to tie up a couple of loose ends. I'm really pleased with the speed and efficiency, and would certainly recommend [them]. Thank you for your help and highly professional…”
Verified client review
NDA - Signed “[They understand] the problem so well and deliver the results super quick. I'll not hesitate to say that I've found a gem. One thousand percent recommended!”
Verified client review
NDA - Signed “Very positive experience. [They are] diligent, hardworking, and [have] good communication skills. Highly recommended.”
Verified client review
NDA - Signed “[They were] very patient, [and] prepared to go the extra mile so I got the result I wanted. Highly recommended.”
Verified client review
NDA - Signed “The project was not easy, literally. [They] did hard work on our project and finished as expected. Would like to work on upcoming new features together. Thank you.”
Verified client review
NDA - Signed “[They are] reasonable, meticulous, [have] a great sense of design, and [are] very responsive. I really enjoyed working with [them] and [they] delivered a beautiful website for me.”
Verified client review
NDA - Signed “Extremely patient and did not stop until what I needed was delivered. Excellent partner to work with!”
Verified client review
NDA - Signed “I didn't expect such great service from someone I found without a referral. I got lucky and I hope to work with [them] again in the future.”
10 daysVerified client review
NDA - Signed “Bought this to create a website for my startup company. Results were above and beyond what I was expecting! Quick to answer, and always gave great input and ideas!”
Verified client review
NDA - Signed “We are very impressed with the service and the delivery and will use them again!”
Verified client review
NDA - Signed “Great work and completed exactly as requested!”
Verified client review
NDA - Signed “100% satisfied. Got more than expected.”
Verified client review
NDA - Signed “Great communication, great result.”
Verified client review
NDA - Signed “Thank you so much for such outstanding work.”
Verified client review
Legacy modernization questions
The practical questions teams ask before letting anyone touch a system that still pays the bills.
Incrementally, by default. Big-bang rewrites freeze feature work and put the whole programme behind one high-risk cutover. We use strangler-fig and branch-by-abstraction patterns so the product stays releasable. A full rewrite is occasionally the right answer; the initial audit tells us when.