APP Modernization
The software that runs your business was written years ago; every change is slow, every upgrade is a risk, and the rewrite quote frightened everyone. As a Dhaka-based company, we deliver legacy software modernization services that fix it one module at a time: audited, put under test, refactored or migrated to your cloud and switched over with a rollback, for international companies, at a fixed price per step. Our engineers and a quality assurance (QA) lead write tests around what your software does today before they change a line of it.
One exit at each step. No long-term commitment at any of them. We start with the one module that costs you the most today: the one every change touches, the one nobody dares deploy, the one on the framework that lost support. Its code, dependencies, data and risks are mapped, the smallest safe change is defined, and every route to it is costed in your own numbers.
You get a written verdict — tests first, a framework upgrade and refactor, a move to your cloud, a module replaced beside the old one, or leave it alone for now. If nothing justifies a change, you stop here and keep the audit.
30 minutes 01 Scope · free call
2 weeks 02 Diagnose · $1,500, half credited to the pilot
6–8 weeks 03 Pilot · $4,000 fixed
Per module 04 Production · from $6,000, quoted after the pilot
Monthly 05 Managed Ops · optional, cancel any month
What is included in legacy software modernization services?
Legacy software modernization services bring the custom software your business still depends on to a supported, testable state in six pieces of work: an audit that maps code, dependencies and risk, tests around today’s behaviour, refactoring and framework upgrades, migration to your cloud, an application programming interface (API) layer, and documentation your team keeps.
Code audit and modernization map
Every module, dependency, framework version, database and integration mapped, with a risk register and a module order that says what to touch first and what to leave alone.
Tests around existing behaviour
Characterization tests written around each module before it changes, so parity can be proven after refactoring and a regression is caught by a test, not by a customer.
Refactoring and framework upgrades
Unsupported language and framework versions brought to supported ones, dead code removed, dependencies replaced, structure cleaned, one module at a time and always behind the tests.
Cloud migration
Software moved off ageing servers into your cloud accounts with backups, monitoring, access control and a deployment pipeline, re-platformed first and refactored where the audit says it pays.
API layer over legacy data
A documented, versioned API in front of the old system, so your customer relationship management (CRM) system, shop, portal or reporting tool reads and writes its data without touching its code.
Database migration and handover
Schemas and data moved to a supported database with a verified cut-over and rollback, then documentation, a runbook, and optional monthly upkeep as the platform changes.
Not included: Mainframe, COBOL, RPG and AS/400 systems · new front ends, which belong to web application development · new modules outside the agreed plan, priced first as a change request.
Which legacy software modernization path fits: refactor, re-platform, rehost or replace a module?
Legacy software modernization follows one of four paths, and the audit chooses by cost and risk. Rehost moves the system as it is; re-platform moves it onto managed cloud services; refactor changes the code, not what it does; replacing a module rebuilds one piece beside the old one. All four are application modernization inside our custom software development work.
Rehost
The system moved to your cloud as it is, with backups and monitoring, when the code is sound but the server is not.
Re-platform
Moved onto managed databases, storage and runtimes, so upgrades and scaling stop being your team’s weekend work.
Refactor
The code changed for supportability (framework, dependencies, structure) while every test proves the behaviour did not change.
Replace a module
One piece rebuilt beside the old system, traffic moved gradually, the old path retired once nobody uses it: the strangler pattern.
How does a legacy software modernization pilot switch one module over safely?
A legacy software modernization pilot switches one module over in five logged steps: scope signed, a safety net of tests, the refactor, a parity sign-off and the switch-over. The example is an invoicing module on an unsupported framework; every item traces to a test, a commit and a switch-over record, and yellow marks where a person signs.
Pilot log · invoicing module
The module at that step · its result
Scope signed
Agreed before any code changes.
ModuleInvoicingFrameworkUnsupportedEndpoints38Existing tests0RollbackPlan agreed
38
Endpoints in scope0 existing tests · rollback plan agreed
Safety net
Tests pin down what the old code does today.
Old path112 tests green
New pathnot built yet
112
Characterization tests green on the old codewritten before a line is refactored
Refactor
The code changes; the behaviour must not.
Framework upgraded14 dependencies replaced
Old pathlive, unchanged
New pathrefactored · 112 tests green
14
Dependencies replaced112 tests still green
Parity sign-off · a person signs
Both paths run the same invoices.
Old patha week of invoices
New paththe same invoices
Differences0 · signed by 7 users
0
Differences between the two paths7 users ran a week of invoices on both
Switched over
The new module goes live beside the old path.
Old path→Switch-over→New module live
Old path kept 30 days30 days of fixes
30
Days the old path staysretired only on your instruction
Click a step, or a number below, to switch the result
Each further module follows the same five steps, one at a time, while the old system keeps running.
Illustrative example. Click a step to see the module at that point. Yellow marks where a person signs; every item traces to a test, a commit and a switch-over record.
How do legacy software modernization services work, from scope to Managed Ops?
Legacy software modernization services run in five steps you can stop between, because modernization fails when it is sold as one big project: a free call, a two-week diagnostic that picks the first module, a six-to-eight-week pilot that puts that module live, production one module at a time, then Managed Ops. Every step ends with a written result.
01 30 min · free
Scope A call about the module that hurts most, the stack it runs on and who still understands it. If the codebase and its users are known, you leave with a diagnostic quote.
02 2 weeks · credited
Diagnose Code, dependencies, database and integrations audited; framework support dates checked; risk register written; the first module chosen by cost of change; the pilot priced in writing.
03 6–8 weeks · fixed price
Pilot Tests written around the first module, then refactoring or migration, deployment to your cloud beside the old path, parity proven, switch-over with rollback, and a demo every two weeks.
04 Per module · quoted after pilot
Production The remaining modules in the audit’s order, each with its own tests, switch-over and 30 days of fixes, plus documentation, a runbook and training for your team.
05 Monthly · optional
Managed Ops Dependency and security updates, monitoring, small changes and a monthly review of the risk register, with a named engineer who knows the code. Cancel any month; everything stays yours.
Who modernizes your legacy software, and with what?
Engineers who have upgraded old frameworks, a QA lead who owns the characterization tests and parity sign-off, and a project manager who runs the demos.
Communication A demo every two weeks and a shared channel
Delivery Your repositories, continuous integration pipeline, staging and production
QA Characterization tests, parity runs, user sign-off before every switch-over
Switch-over Every module beside the old path, with a written rollback
Cloud Backups, monitoring and access control in your cloud accounts
Ownership Code, tests, infrastructure and documentation, all in your name
Which legacy modernization step comes first: tests, a refactor, a cloud move, a new module or the audit?
The first legacy modernization step depends on five facts; five questions show which fits. No tests means the safety net first; an unsupported framework, an upgrade and refactor; a server in a cupboard, your cloud first; weekly changes by hundreds of users, a replaced module; a supported, tested system, an audit ranking. A new front end is web application development.
1. How often does the code still change?
2. Where does it run today?
3. Do automated tests exist?
4. Is the language or framework still supported?
5. How many people depend on it daily?
Which one do you need? Answer five questions.
A safety net first: tests around what exists
Nothing can be changed safely until the current behaviour is pinned down: characterization tests are written around the first module before a line is refactored, so parity can be proven at every step.
A first estimate; the diagnostic confirms it.
How the verdict is decided
No tests → the safety net first
End-of-life framework → upgrade and refactor
On a server in the office → your cloud first
Weekly changes and over 200 users → replace that module
Everything else → the diagnostic decides the order
Why choose us as your legacy software modernization company?
A legacy software modernization company is judged on whether the system is still running the day after switch-over, not on its slide deck. We deliver software modernization services under tests, module by module, priced in writing, with personal data in test copies handled under Article 28 of the General Data Protection Regulation (GDPR).
Without a staged process
!!!!!
- A big-bang rewrite that is eighteen months late and still missing features
- Changes made with no tests, found by customers on Monday
- Hourly billing that grows every time the old code surprises someone
- A new system in the vendor’s account you cannot run without them
With EICRA
Pilot report · Invoicing module
Endpoints38Tests written112Dependencies replaced14Parity differences0VerdictSwitched over
Illustrative example
- Tests around today’s behaviour before a single line changes
- Fixed prices at every step; production quoted in writing after the pilot
- Code, tests and infrastructure in your accounts from the first commit
- Your sign-off on parity before any module is switched over
Is it safe to outsource legacy software modernization?
Outsourcing legacy software modernization is safe when tests, access and ownership are settled in writing, because the danger in old software is untested change. As a Bangladesh-based company, we work in your repositories and cloud, change nothing without green tests, use masked data outside production, sign a data processing agreement and leave at handover. Reviewed By Eicra.com team
Which modernization agreements are signed, and when?
Non-disclosure agreement (NDA) — mutual, signed before any code, credential or data sample is shared with anyone.
Data processing agreement (DPA) — processor terms under Article 28(3) of the GDPR and the equivalent national law, for any personal data in the system or its test copies.
International data transfers — standard contractual clauses or the transfer instrument your jurisdiction requires, signed before personal data moves.
Access — least-privilege roles in your repositories and cloud; production credentials stay in your vault, never in ours.
Certifications — listed only when held; none are claimed on this page or in any proposal.
What modernization controls, IP and rework terms apply?
Your accounts Repositories, pipelines, environments and domains stay in or move into your accounts; nothing is hosted on our side.
Code ownership All intellectual property (IP), including the tests, is assigned to you in the contract; third-party licences are listed, and none are copyleft without your sign-off.
Production data Test and staging environments run on masked or synthetic data; production is touched only through your access controls, logged, and never copied out.
Switch-over Every module goes live beside the old path with a written rollback; the old path stays for 30 days and is retired only on your instruction.
Rework Free when a module fails its agreed parity tests; new modules are priced first as a change request.
What proof do you get before you pay for legacy software modernization?
Before you pay for legacy software modernization, you get evidence instead of promises: measured commitments, your own written risk register after the diagnostic, and a pilot that puts one module live before production is quoted. Client case studies with numbers are added here as clients give permission to name them.
2 weeks
For the diagnostic: code, dependencies and risks audited, and a written plan that picks the first module.
6–8 weeks
From the start of the pilot to the first module live in your cloud, proven against tests.
30 days
The old path stays beside the new module after switch-over, with 30 days of fixes.
Case studies: client results with numbers are added here as clients give permission to name them. Ask on the scoping call for references in your industry.
What do buyers ask about legacy software modernization?
How much do legacy software modernization services cost?
Our legacy software modernization services are priced per outcome, not per hour, and each price is on the price cards at the top: a two-week diagnostic that audits the code, maps dependencies and risks and ends in a written plan, half credited to the pilot; a pilot that puts one module live with tests passing; then production, quoted after it.
What are legacy software modernization services?
Legacy software modernization services take the custom software your business still depends on (old frameworks, unsupported languages, a database nobody dares touch) and bring it to a supported, testable, cloud-ready state without stopping the business: a code audit, tests around the existing behaviour, refactoring or framework upgrades, migration to your cloud, an API layer, and documentation your team keeps.
Refactor or rewrite: which is cheaper and safer?
A rewrite looks cleaner on a slide and fails more often in practice: the old system encodes years of business rules nobody wrote down, and a rewrite must rediscover them all before it is useful. Refactoring module by module keeps the system running and spends money only where it hurts. We rewrite a module only when the audit proves it.
How long does legacy modernization take?
The first module is live in eight to ten weeks: a two-week diagnostic that audits the code, writes tests around current behaviour and picks the first module, then a six-to-eight-week pilot that refactors or migrates it, proves parity against those tests and switches it over. Further modules follow one at a time, so the system improves while it keeps running.
Can you modernize without downtime?
We plan for it and cannot guarantee it. Each module is modernized beside the old one, switched over with a rollback path, and switched back if anything fails; cutovers happen in your quiet hours with your sign-off. That keeps planned downtime to minutes per module in most cases; the diagnostic’s risk register says where it cannot be avoided.
Start with a free 30-minute scoping call or the two-week diagnostic.