Upgrade a legacy application without breaking what’s working
Most legacy systems aren’t broken—they’re just built for a version of the business that doesn’t exist anymore. We help you stabilise, upgrade, and modernise without the panic move.
Upgrade a legacy application without breaking what’s working
Most legacy systems aren’t broken—they’re just built for a version of the business that doesn’t exist anymore. We help you stabilise, upgrade, and modernise without the panic move.
The difference between maintaining a system and future-proofing it
Letting old systems run until they break is what most teams do. Great teams turn them into an advantage while keeping the wheels turning.
How most teams handle legacy systems
How most teams handle legacy systems
Delay upgrades until it becomes a crisis
Add features on top of brittle foundations
Outsource maintenance to whoever’s available
Delay upgrades until it becomes a crisis
Add features on top of brittle foundations
Outsource maintenance to whoever’s available
How great teams handle them
How great teams handle them
Modernise in phases—without rewriting everything
Address technical debt before it blocks growth
Treat maintenance as strategy, not babysitting
Modernise in phases—without rewriting everything
Address technical debt before it blocks growth
Treat maintenance as strategy, not babysitting
VS
This is how Halcrow modernises applications
Get strategic, staged upgrades that protect your application's value while unlocking speed.
Tech debt paid down while value stays live
Critical paths refactored, not rewritten
Stability and observability prioritised from the start
Modern tooling layered without disruption
Maintenance that prepares you for what’s next
TESTIMONIAL
TESTIMONIAL
TESTIMONIAL
"This is the beauty of partnering with Halcrow: we extend our technical capabilities seamlessly without the overhead of hiring in-house.”
"This is the beauty of partnering with Halcrow: we extend our technical capabilities seamlessly without the overhead of hiring in-house.”
"This is the beauty of partnering with Halcrow: we extend our technical capabilities seamlessly without the overhead of hiring in-house.”
Angela Bevitt-Parr
Angela Bevitt-Parr
Angela Bevitt-Parr
National Marketing Manager, AWS Australia
National Marketing Manager, AWS Australia
National Marketing Manager, AWS Australia
Key Deliverables
What we deliver
Codebase audit and stability report
Identify what’s solid, what’s fragile, and what’s getting in your way.
Codebase audit and stability report
Identify what’s solid, what’s fragile, and what’s getting in your way.
Codebase audit and stability report
Identify what’s solid, what’s fragile, and what’s getting in your way.
Refactoring roadmap tied to business priorities
We break upgrades into clean phases, each mapped to risk, speed, and value.
Refactoring roadmap tied to business priorities
We break upgrades into clean phases, each mapped to risk, speed, and value.
Refactoring roadmap tied to business priorities
We break upgrades into clean phases, each mapped to risk, speed, and value.
Dependency and framework upgrades
Keep your app secure, supported, and performing without a full rewrite.
Dependency and framework upgrades
Keep your app secure, supported, and performing without a full rewrite.
Dependency and framework upgrades
Keep your app secure, supported, and performing without a full rewrite.
Monitoring, testing, and release automation
Gain confidence and control with smart CI/CD and visibility wired in.
Monitoring, testing, and release automation
Gain confidence and control with smart CI/CD and visibility wired in.
Monitoring, testing, and release automation
Gain confidence and control with smart CI/CD and visibility wired in.
Embedded maintenance support
We handle updates, small changes, and backlog grooming—without stalling core delivery.
Embedded maintenance support
We handle updates, small changes, and backlog grooming—without stalling core delivery.
Embedded maintenance support
We handle updates, small changes, and backlog grooming—without stalling core delivery.
Optional Add-Ons
Feature prioritisation and UX clean-up
We help you cut bloat, clarify intent, and improve usability without triggering a full redesign.
Feature prioritisation and UX clean-up
We help you cut bloat, clarify intent, and improve usability without triggering a full redesign.
Feature prioritisation and UX clean-up
We help you cut bloat, clarify intent, and improve usability without triggering a full redesign.
Cloud replatforming or containerisation
Migrate your app to modern infra—no lift-and-shift nonsense, just clean, stable, cost-efficient hosting.
Cloud replatforming or containerisation
Migrate your app to modern infra—no lift-and-shift nonsense, just clean, stable, cost-efficient hosting.
Cloud replatforming or containerisation
Migrate your app to modern infra—no lift-and-shift nonsense, just clean, stable, cost-efficient hosting.
Security hardening and compliance upgrades
Patch vulnerabilities, tighten controls, and get audit-ready with practical changes that don’t break your stack.
Security hardening and compliance upgrades
Patch vulnerabilities, tighten controls, and get audit-ready with practical changes that don’t break your stack.
Security hardening and compliance upgrades
Patch vulnerabilities, tighten controls, and get audit-ready with practical changes that don’t break your stack.
Not sure where to start?
We’ll walk your team through what to fix, what to leave, and how to upgrade without pulling the rug out from under your business.
What we build
Systems that stay solid while you evolve fast.
Customer platforms that don’t crumble under growth
We stabilise and upgrade critical systems so user experience and performance scale with demand.
Customer platforms that don’t crumble under growth
We stabilise and upgrade critical systems so user experience and performance scale with demand.
Customer platforms that don’t crumble under growth
We stabilise and upgrade critical systems so user experience and performance scale with demand.
Internal tools that don’t slow teams down
From approval flows to scheduling logic, we modernise and maintain what your team relies on daily.
Internal tools that don’t slow teams down
From approval flows to scheduling logic, we modernise and maintain what your team relies on daily.
Internal tools that don’t slow teams down
From approval flows to scheduling logic, we modernise and maintain what your team relies on daily.
Business systems that are safe to improve
Core apps like billing, logistics, and inventory stay live while we refactor under the hood.
Business systems that are safe to improve
Core apps like billing, logistics, and inventory stay live while we refactor under the hood.
Business systems that are safe to improve
Core apps like billing, logistics, and inventory stay live while we refactor under the hood.
APIs and services built for scale, not surprises
We decouple, document, and stabilise integrations so other teams can ship faster without breaking things.
APIs and services built for scale, not surprises
We decouple, document, and stabilise integrations so other teams can ship faster without breaking things.
APIs and services built for scale, not surprises
We decouple, document, and stabilise integrations so other teams can ship faster without breaking things.
Monoliths with clear paths to modularity
We identify seams and split functions over time—no painful re-architecture needed on day one.
Monoliths with clear paths to modularity
We identify seams and split functions over time—no painful re-architecture needed on day one.
Monoliths with clear paths to modularity
We identify seams and split functions over time—no painful re-architecture needed on day one.
Legacy frontends that feel new again
We refresh old UI stacks with modern frameworks, better UX, and mobile responsiveness—without rebuilding from scratch.
Legacy frontends that feel new again
We refresh old UI stacks with modern frameworks, better UX, and mobile responsiveness—without rebuilding from scratch.
Legacy frontends that feel new again
We refresh old UI stacks with modern frameworks, better UX, and mobile responsiveness—without rebuilding from scratch.
What happens when legacy isn’t a liability
Most teams avoid touching legacy until it breaks. We turn it into a platform for what’s next.
Results
Rebuilt core billing logic in an 8-year-old monolith, reducing failure rates by 99%
Results
Migrated .NET app from on-premise to Azure with zero downtime and improved deploy speed by 4x
Results
Layered automated testing + CI/CD into a critical legacy system, reducing post-release bugs by 80%
Customers love Halcrow
Over one million engineering hours delivered to Australia's mid-market entrepreneurs and intrapreneurs
Over one million engineering hours delivered to Australia's mid-market entrepreneurs and intrapreneurs
Over one million engineering hours delivered to Australia's mid-market entrepreneurs and intrapreneurs
OUR CULTURE
OUR CULTURE
This is where good
work gets done
This is where good
work gets done
We only hire great minds who treat your ambition as their own—a culture that’s just been recognised with the Best Workplaces in Technology award.
We only hire great minds who treat your ambition as their own—a culture that’s just been recognised with the Best Workplaces in Technology award.
Tools and technologies we use
We bring deep expertise across the platforms your business runs on. Our certified engineers don't just use these tools—they know how to bend them to your competitive advantage.
Services that connect the dots
Services that connect the dots
Why work with Halcrow
With a heritage in craftsmanship and a mindset for scale, we don’t panic at old code. We respect what’s been built, sharpen what works, and help you move without losing control.
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Specialists
You'll be working with certified team members who have deep domain expertise
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Specialists
You'll be working with certified team members who have deep domain expertise
01
Specialists
You'll be working with certified team members who have deep domain expertise
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Ownership
We work like your internal team, with shared accountability
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Ownership
We work like your internal team, with shared accountability
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Ownership
We work like your internal team, with shared accountability
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Obsession
We sweat every detail, test every edge case, and don’t stop until everything works beautifully
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Obsession
We sweat every detail, test every edge case, and don’t stop until everything works beautifully
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Obsession
We sweat every detail, test every edge case, and don’t stop until everything works beautifully
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Craftsmanship
From model cars to modern systems, we’ve always cared about how it’s made
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Craftsmanship
From model cars to modern systems, we’ve always cared about how it’s made
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Craftsmanship
From model cars to modern systems, we’ve always cared about how it’s made
Let's find out if we're your unfair advantage
Let's find out if we're your unfair advantage
Let's find out if we're your unfair advantage
Frequently asked questions
What does Halcrow do?
What does Halcrow do?
What does Halcrow do?
How is Halcrow different from a software agency or consultancy?
How is Halcrow different from a software agency or consultancy?
How is Halcrow different from a software agency or consultancy?
Who does Halcrow work with?
Who does Halcrow work with?
Who does Halcrow work with?
Which industries does Halcrow support?
Which industries does Halcrow support?
Which industries does Halcrow support?
What is an embedded team model?
What is an embedded team model?
What is an embedded team model?
What if I don't know exactly what I need yet?
What if I don't know exactly what I need yet?
What if I don't know exactly what I need yet?