01
Assess
We map the legacy system, its real behaviour, dependencies, and the business value locked inside it.
Application Modernization
Modernize legacy systems without betting the business on a rewrite.
Replatform, refactor, and re-architect aging applications onto modern, cloud-native foundations — incrementally, with the business running the whole time.
Overview
What is application modernization?
Application modernization is the work of bringing aging software up to date — moving it onto modern architectures, languages, and cloud-native infrastructure so it's faster, cheaper to run, more secure, and possible to change again. Legacy systems aren't bad because they're old; they're a problem when they block new features, leak risk, cost a fortune to run, or only one person understands them.
We modernise incrementally, not with a big-bang rewrite that risks the whole business. Using the strangler-fig pattern, we stand up modern components alongside the legacy system and migrate functionality in slices, keeping everything running and reversible at each step. Along the way we containerise, add automated testing and CI/CD, and move to managed cloud services — so the modernised system is genuinely operable, not just rewritten.
The hardest part of modernization is preserving the institutional knowledge buried in old code while shedding its constraints. We treat that with respect: understanding what the system really does before we change it, so the new version keeps what mattered and drops what didn't.
How we work
Our application modernization process
02
Strategy
Replatform, refactor, or re-architect — chosen per component, sequenced to deliver value early.
03
Strangle
Modern components stood up alongside the legacy system; functionality migrated in safe, reversible slices.
04
Harden
Containers, automated testing, CI/CD, and cloud-native infrastructure make the new system operable.
05
Retire
The legacy system is decommissioned only once the modern one fully owns its responsibilities.
Benefits
Why modernize
Ship features again
Unblock a roadmap that legacy constraints have been stalling for quarters.
Cut running costs
Modern, cloud-native infrastructure is usually far cheaper to operate than legacy estates.
Close security gaps
Retire unsupported frameworks and platforms that quietly accumulate risk.
No big-bang risk
Incremental, reversible migration keeps the business running throughout.
Maintainable again
Code and infrastructure your current team can actually understand and change.
Ready to scale
Modern foundations that handle growth instead of buckling under it.
Use cases
What we modernize
Replatforming
Move apps onto modern runtimes and cloud infrastructure with minimal change.
Monolith decomposition
Carve a monolith into services where it actually helps — not for its own sake.
Framework upgrades
Move off unsupported, end-of-life frameworks and languages.
Containerisation
Package legacy apps to run on modern, portable infrastructure.
Data migration
Move and modernise data stores safely, without losing history.
Cloud re-platforming
Bring on-prem or dated cloud setups onto modern managed services.
Tech stack
Tools and platforms we ship with
The right tool for the job, chosen on fit and reliability — not on what we're married to.
AWS
Cloud
Docker
Containers
Kubernetes
Orchestration
Terraform
IaC
Next.js
Web
Node.js
Services
PostgreSQL
Data
GitHub Actions
CI/CD
Why Tackxel
Cloud engineering from a team that runs it in production
We build modern, cloud-native systems from scratch every day — auto-scaling AWS platforms with containers, managed databases, and CI/CD (ShiftERP, PropMetrics, MultiUnitX, LuxeLocker). That's the target state we move legacy systems toward, and we know how to land it incrementally.
We respect what legacy systems got right and modernise without betting the business on a rewrite. Senior engineers, 11+ products shipped.
11+
Products shipped
4+
AWS platforms shipped
99.5%
EDI accuracy on ShiftERP
Cloud proof in production
SE
Preview coming soon
ShiftERP
Enterprise ERP for co-manufacturers with EDI to Walmart, Target, and Amazon at 99.5% accuracy — built from zero on AWS.
LL
Preview coming soon
LuxeLocker
Native iOS and Android with IoT-controlled access for a US luxury storage operator — mobile, hardware, and cloud as one build.
PM
Preview coming soon
PropMetrics
Investor SaaS for real estate agents — live MLS data, analytics, and role-based access on a Dockerized AWS stack.
FAQ
Application Modernization questions, answered
Rarely, and only when truly warranted. Big-bang rewrites are high-risk; we prefer incremental modernization (the strangler-fig pattern) that keeps the business running and stays reversible.
Related services
Explore what pairs with application modernization
Built to ship
Ready to build with application modernization?
Tell us what you're trying to build. We'll handle the rest.