Legacy Modernisation & Replatforming

What we do

Capabilities under one accountable team.

01

Mainframe decomposition

COBOL/JCL/IMS analysis, domain extraction, strangler-fig migration to cloud-native services with parallel run.

02

ERP modernisation

SAP, Oracle, Workday — clean-core principles, side-car extensions, integration via composable platforms.

03

Bespoke core replacement

Lotus Notes, FoxPro, .NET WebForms, ageing Java monoliths — replaced with modern cores running in parallel.

04

Data modernisation

Move from batch to event. Kafka, Debezium, semantic layers, governance — without losing the audit trail.

What to expect

Outcomes you can hold us to — by horizon.

0–90 days

Foundations

Outcome tree, baseline metrics, and a working pilot in production by day 90 — defensible with finance, signed off by risk.

3–12 months

Scale

Squad expansion across the next 2–3 value pools. Live-parallel cutovers. Capability uplift inside the client team.

12+ months

Run & optimise

Managed run with named SLOs, quarterly value reviews, and a continuous-improvement budget reserved for innovation, not toil.

How we deliver

Five steps. One accountable team.

Map

4 weeks

Domain map, transaction map, dependency map. Find the fault lines.

Strangle

8–12 wks

Carve off the first bounded context. Live-parallel from day one.

Migrate data

Q2

CDC, dual-write, reconciliation. Audit trail preserved.

Decommission

Q3

Retire the legacy module by module. Confidence earned, not declared.

Run

Continuous

Managed run on modernised core, with the legacy team transferred in.

Anchor case study

National bank decomposes 30-year-old core in 22 months — zero customer downtime.

NB

Banking · India

Problem

Mainframe-bound core: COBOL, batch-only, weekend cutovers. New product launches blocked. Talent retiring out.

Solution

Domain-by-domain strangler-fig migration to cloud-native microservices with CDC-driven dual-write and parallel reconciliation. 18 production releases over 22 months.

Impact

Throughput 2.4× · Time-to-market new product 9 months → 6 weeks · Mainframe footprint −62% · Zero downtime cutovers.

Field-tested in enterprise modernization

More programmes we have shipped.

All case studies →

BFS

How we engage

Three commercial models. One outcome standard.

We avoid open-ended retainers. Every model names its outcome and its measurement window in the contract.

01 · Diagnose

Fixed-price diagnostic

2–4 week engagement. Outcome tree, baseline metrics, prioritised value pools, and a board-ready 18-month roadmap. Stop-go decision in week 4.

From USD 80k · 2–4 weeks

02 · Pilot

Outcome-linked pilot

8–12 week engagement to ship one value pool, end-to-end, with a measurable KPI commitment. Joint squads with the client team. Live-parallel before cutover.

Outcome-linked + capped fee · 8–12 weeks

03 · Scale & run

Programme + managed run

Multi-quarter scale-out with managed services on top. Quarterly value reviews. SLO-tied annual incentive. Capability transfer by design.

T&M + outcome incentive · Multi-quarter

FAQ

Frequently asked questions

Replace the core or modernise around it? +

Often modernise around it. The core is rarely the highest-ROI replacement. We start with the value pools.

How long? +

Bounded contexts: 8–12 weeks. Whole core: 18–36 months. We always ship something to production in quarter one.

What about data migration? +

CDC + dual-write + reconciliation. The audit trail is preserved end-to-end.

Risk of regression? +

We run live-parallel until reconciliation is clean. Cutover is a flag flip, not a weekend war room.

Cost vs benefit? +

Median TCO reduction 34% post-modernisation, against a 2-year payback. We model your case before you commit.

Can you take over a stalled programme? +

Often — and we have. 4-week recovery diagnostic with a stop-go recommendation.

Talk to a partner

Book a enterprise modernization briefing.

A senior partner will respond within one business day with a tailored agenda.

Request Executive Briefing

Strangle the legacy. Keep the balance sheet running.