01
New projects
A paragraph about the problem is enough to start. We reply within two working days, usually with questions rather than a quote.
Web2 · Service Legacy system modernization
Modernize a legacy system without a big-bang rewrite: a written assessment first, then incremental migration with the old path live and a tested rollback.
In short
Legacy modernization means replacing or restructuring an old system that the business still depends on. A full rewrite switched on in one go is the riskiest way to do it. We start with a written assessment of what the system does and what it costs you, then migrate one piece at a time while the old system keeps running, with a rollback that has actually been tested.
- How to engage
- Modernization audit, Product build, Dedicated engineering pod
- Practice
- Web2
Signs this is the right service
- A system nobody fully understands is blocking new features.
- You inherited a codebase and must decide between fixing and rewriting.
- The platform runs on a version or a host that is about to lose support.
- A previous rewrite stalled halfway and both systems are now in production.
What you get
Written assessment
What the system does, where the risk sits, what it costs to run and change, and a recommended order of work.
Incremental migration plan
A strangler-pattern route: new components take over one function at a time behind a routing layer.
Data migration
Schema mapping, dual-write or backfill, and reconciliation that proves the new data matches the old.
Safety net
Characterisation tests that record what the old system really does, so behaviour changes are deliberate.
Cutovers with rollback
Each switch rehearsed in advance, with a rollback that has been run, not just written.
The process
- 01
Assess
Two to three weeks reading the code, the infrastructure and talking to the people who run it.
- 02
Decide
Fix, wrap, migrate or replace — per component, with the reasoning written down.
- 03
Migrate in slices
One function at a time, each delivering something usable.
- 04
Retire
The old component is switched off only after the new one has carried real load.
TypeScriptGoPostgresKubernetesTerraformAWS
Legacy modernization: common questions
Should we rewrite from scratch?
- Rarely. A rewrite has to reproduce years of unrecorded behaviour before it delivers anything. Incremental migration delivers value at each step and can be stopped at any point with a working system.
What does the assessment cost?
- A fixed fee, agreed up front, which is credited against the build if you go ahead with us.
Can the old system stay live during the work?
- Yes, that is the point of the approach. The old path keeps serving traffic until each replacement has been proven.
What if there is no documentation?
- That is normal. We recover the behaviour from the code, the data and the people who operate it, and we write it down as part of the assessment.
06 / Let’s build
Bring us the difficult problem.
02
Careers
Engineers, designers and researchers who like systems that are hard to get right. Send something you built and what you would change about it now.
03
Studio
Based in India and working remotely, with overlap hours agreed up front so your team always has a time to reach us.
04
Read
Guides on AI agents, RAG, MCP, tokenization and chain abstraction, written by the engineers who build them.