Software Development

Legacy modernisation

We modernise ageing systems in steps, not a risky big-bang rewrite: carving out pieces, putting tests around what exists and moving to a modern stack while the business keeps running.

Is this for you?

You’ll get value from this if…

  • A critical system runs on technology few people still know
  • Every change is slow, risky and expensive
  • The system can't integrate with the tools you now need
  • A previous rewrite attempt stalled

Benefits

What changes for your business

What you get

What we deliver

  • System assessment

    What the system does, how it is built and where the risk is.

  • Modernisation roadmap

    An incremental plan, ordered so value arrives early.

  • Safety net

    Tests around current behaviour so changes don't break what works.

  • Migrated components

    Modern replacements, switched over piece by piece.

How it works

From first call to running in production

  1. 01

    Assess

    Read the code, talk to the people who run it and map dependencies.

  2. 02

    Plan

    Choose what to replace first and how to run old and new side by side.

  3. 03

    Migrate

    Move one piece at a time behind a stable interface.

  4. 04

    Retire

    Switch off the old parts once the new ones are proven.

Example applications

What this looks like in practice

Typical applications of this service. Illustrative, not client case studies.

  • 01Moving a monolith to modular services step by step
  • 02Upgrading unsupported frameworks and runtimes
  • 03Putting an API in front of an old system so new apps can use it
  • 04Migrating on-premise systems to the cloud

Technology

Tools we work with

Why Bitfumes

Built by engineers who ship

  • Senior team, no hand-offs

    The engineers on your first call are the ones who build your product.

  • 10+ years of engineering leadership

    Led by Sarthak Shrivastava, Docker Captain, AWS Certified Solutions Architect, AWS Certified Developer.

  • We teach this for a living

    156K+ developers learn from our founder on YouTube, and 100K+ on Udemy.

  • Production, not prototypes

    Tests, monitoring and handover are part of every build, not extras.

100+
Projects delivered
40M+
Users reached
98%
Client retention
9 yrs
In business

How to start

From first conversation to production

  1. 1

    Talk to us

    Tell us the problem. We come back with a straight view on whether it is worth building.

    Get in touch
  2. 2

    Build

    A senior team embeds with yours and ships in short cycles, with a demo every week.

  3. 3

    Run and improve

    We hand over cleanly, or stay on to monitor, support and extend what we built.

FAQs

Common questions

Why not rewrite from scratch?

Big-bang rewrites often run long and miss behaviour the old system handled quietly. Incremental migration keeps the business running and delivers value sooner.

Will there be downtime?

We plan migrations to run old and new side by side so switch-overs can be gradual and reversible.

Can you work with undocumented code?

Yes. Understanding and documenting the existing system is the first part of the work.

How do you decide what to modernise first?

By weighing business pain, risk and dependencies, so early steps deliver value and make later ones easier.

Can our team keep working on the system meanwhile?

Yes. We plan the work so your team can keep shipping changes while the migration happens.

Industries

Where we apply it

Insights

Related reading

Next step

Want this built into your business, not just explained?

Tell us the problem and we'll come back within one business day with a straight view on whether AI is worth it for you, and what it would take to build.

Talk to us→

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