Service

Replace the spreadsheets,
or rebuild what you still run.

Custom software for two situations. Your core process runs in spreadsheets and in tools that no longer fit, so we build one system around how the business works. Or your product runs on a base nobody can extend, so we rebuild it from the ground up. The new version reads the same live data, with zero downtime.

See the proof
The data never moves

Only the old system runs today. The new system does not exist yet.

1,106
automated tests prove the new system matches the old one
0
records migrated - the new version reads the same live data
3 months
from an empty repository to a live multi-tenant product
4+ years
in production for one platform, with no in-house IT team

01 - The situation

The process outgrew the spreadsheet. The product outgrew its base.

One core process still runs in spreadsheets, or a product still runs on a base nobody wants to touch. Either way, the risk grows every week you wait.

Where custom software stalls

  • The core process runs across five spreadsheets, because no system ever matched it.
  • A rebuild sounds risky, so the old code stays untouched for another year.
  • A migration could lose a customer record, so nobody signs off on it.
  • A small change waits weeks, because the one developer who understood it left.

What we do instead

  • We build one system that matches the process step by step.
  • We rebuild feature by feature against the live system, so nothing breaks.
  • The new system reads the same live data, so no record moves.
  • A documented, tested system does not depend on one person's memory.

02 - What you get

Three things leave the build with you

Not a rewrite from a guess, and not a risky migration weekend. One system, proven against the one it replaces.

01

One system, built around your process

A single application that replaces the spreadsheets and the disconnected tools, or replaces a product base you can no longer build on.

What it is

We map the process as your team runs it today, exceptions included. For a rebuild, we work feature by feature against the live original. We do not lose a behavior by accident. Casa Paleologu runs its entire commercial operation this way, in production since 2022.

Why it matters

The system fits the business, not a generic template. One person can run and extend it, with no in-house IT department needed.

02

A switch, not a migration

The new system reads the same live data as the old one, with no separate migration step. The switch is one setting, ready to reverse.

What it is

We do not move customer data to a new store on a fixed date. The new system connects to the same live data from the first day of the build. When every automated test passes, one setting moves the traffic across.

Why it matters

You avoid the cutover weekend and the risk of a lost record. If anything looks wrong after the switch, you reverse it in minutes.

03

Proof, plus dashboards on your own data

An automated test suite that proves feature parity, plus custom dashboards built on the live system.

What it is

We track every feature of the old system and its match status in the new one, backed by automated tests. The SafestMenu rebuild carries 1,106 of them. Custom dashboards and reports ship with the system, built on your own operational data.

Why it matters

You see the switchover proven before it happens, not after. Management gets a live view of the business, instead of a monthly export.

03 - How it runs

Four phases. The data never moves.

The old system stays live until the new one earns its place. You see proof at every phase, not only at the end.

The data never moves

Only the old system runs today. The new system does not exist yet.

Phase 1

Map the process or the product

We map the process as your team runs it today. For a rebuild, we track every feature of the product you use now.

Phase 2

Build against the live data

We build the new system against the same live data. The old system stays live throughout the build.

Phase 3

Prove feature parity

We test the new system against the old one, feature by feature. Automated tests confirm every match before the switch.

Phase 4

Switch, with a reverse ready

One setting moves traffic to the new system. The switch reverses at once if a problem appears.

04 - Proof

Where we did this work

Four builds that replace what a business outgrew. Each one shows the process, the numbers, and what runs today.

A ground-up rebuild of SafestMenu, our restaurant menu platform, with no downtime

Hospitality, restaurant software

A ground-up rebuild of SafestMenu, our restaurant menu platform, with no downtime

SafestMenu is our own QR menu platform for restaurants, in use since 2020. We rebuilt it from the ground up on a modern base, and the restaurants continued to use it throughout. The new version reads the same data as the old one, and it matches the old one feature for feature, with 1,106 automated tests as proof.

Read the case study
Casa Paleologu: a custom course-sales platform, run for years without an IT department

Education, culture, publishing

Casa Paleologu: a custom course-sales platform, run for years without an IT department

A Bucharest cultural institution runs its entire commercial operation on a custom platform: enrollment, card payments, Romanian fiscal invoices, and customer accounts. A fraction of a developer operates the platform, in production since 2022.

Read the case study
From email chains to a tamper-evident traceability platform

Circular economy, metal recycling, industrial decommissioning

From email chains to a tamper-evident traceability platform

A small team built a multi-tenant traceability platform for industrial decommissioning in three months, from an empty repository. The platform holds one shared record per project, a custody event for every material hand-off, and an audit trail with a cryptographic chain.

Read the case study
A team learns to build with agents: one workshop week, then a production port at startup speed

Commodity trading, circular economy

A team learns to build with agents: one workshop week, then a production port at startup speed

One week of on-site agentic development training, then eight weeks of guidance. A scale-up's own developers ported their internal operations platform from an AI app builder to a production TypeScript stack. The port took more than 2,500 commits in six weeks, and the team itself wrote roughly three quarters of them.

Read the case study
All case studies

05 - Questions

Common questions

How much does custom business software development cost?
We quote one fixed price for the agreed scope, before the work starts. The price depends on the size of the process, the data you bring, and whether the work is a new build or a rebuild. A scoping session is free. It ends with a concrete number. You keep that number even if you build the system somewhere else.
What does legacy software modernization mean at Transfactor?
It means a ground-up rebuild of a product on a base you still run, without a break in service. We rebuilt SafestMenu, our own restaurant menu platform, this way. The rebuild reads the same live data as the original, so no customer record moves. Restaurants used the product every day of the rebuild. The rebuild carries 1,106 automated tests that prove it matches the old product, feature for feature.
Can you turn a spreadsheet into a custom web app?
Yes. We map the process as your team actually runs it, exceptions included. Casa Paleologu, a Bucharest nonprofit, now runs its entire commercial operation this way: enrollment, payments, invoices, and customer accounts. The platform runs with no in-house IT department. A fraction of a developer operates and extends it, in production for more than four years.
How do you get zero downtime during a legacy system rebuild?
The new system reads the same live data as the old one, from the first day of the build. There is no separate migration step, and no cutover weekend where data sits in two places. The old system stays live until the new one passes every test. The switch itself is one setting. It reverses at once if a problem appears.
How do you prove the new system matches the old one, feature for feature?
We track every feature of the old system and its match status in the new one. We check each entry against a live copy of the system, not on paper. Automated tests back every entry on that list. The SafestMenu rebuild carries 1,106 of them, built under a rule of at least ninety percent code coverage. You see this proof before the switchover, not after.
Do custom dashboards and reports come with the system?
Yes. Custom dashboards and reports on your own live data ship with the system, not as a separate project later. Casa Paleologu's management team sees five years of course sales in a live dashboard that reads the platform's own data. We build these dashboards on the same data your team already works from, so nothing needs a separate export.

06 - Related

Other services

Most engagements combine two of these. Start where the risk is highest.

MVP development sprintA fixed-scope sprint of 4 to 6 weeks. It ends with a deployed product, the codebase, and a roadmap.Custom-built AI agentsAgents that take real actions in your product and your operations, under permission controls you select.Long-term product partnershipA senior team that builds, operates, and extends your product every month, at fractional cost.Proof of concept and pilotsA functional prototype in 3 to 6 weeks that answers one question: scale it, or stop it.AI opportunity workshop and roadmapA workshop with your process owners that shows where AI pays off, and in which order.Agentic development workshopsWe teach your developers to ship production software with AI agents, then guide the first build.Technical due diligenceA review of the code, the architecture, and the team before you invest, delivered as a written report.
This service, written for one audienceFor SMBs

Have a system nobody wants to touch?

Book a free scoping session. We look at the process or the product, and we tell you honestly whether it needs a new system, a migration, or a full rebuild. You leave with a concrete plan and a concrete price.

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