Move legacy systems forward without stopping the business.
A modernization is a multi-year operating-model change wearing software clothing. We approach it as an engineering exercise, not a re-platforming sales motion.
Outcomes we are accountable to
- A modernization plan sequenced by business risk, not technical fashion
- Reduced cost-to-change on systems that have outgrown their original architecture
- A run model that absorbs the next wave of platform shifts
Problems we solve
When teams call us in.
- 01A core platform that costs more to keep running than to rebuild — but the rebuild keeps slipping.
- 02A mainframe or stored-procedure-heavy system whose institutional knowledge is leaving with the original team.
- 03A monolith that has been "going micro-services" for two years with nothing in production.
- 04Cloud migration of a legacy app that re-created the same coupling, just with higher infra bills.
Methodology
The Dezynum Modernization Sequence
- Phase 1
Inventory & risk map
Catalog the system, its dependencies, its consumers, its data flows, and the parts of the business that would notice within a day if it stopped.
- Phase 2
Target architecture & sequencing
Decide what to keep, what to wrap, what to rewrite. Sequence the rewrite so the business keeps running and value lands every quarter.
- Phase 3
Strangler & parallel-run
Move traffic incrementally. Keep the legacy system serving until the new one is provably better, with reconciliation automated.
- Phase 4
Decommission & operate
Retire the legacy system once telemetry confirms parity, then transition into the run model that keeps the new system honest.
Capabilities
What we deliver inside this practice.
Modernization assessment
A senior architect spends two to four weeks inside the system. The output is a working artifact — not a slide deck — that shows the target architecture, the sequencing, and the risks at each stage.
Strangler-fig and incremental rewrites
For systems where a big-bang rewrite is too risky, we route traffic to the new code path-by-path while the legacy keeps serving the rest.
Containerization and Kubernetes migration
Move applications to containers and orchestrators with the operational practices that make them worth the migration — not just the runtime change.
Mainframe and stored-procedure unwinding
Translate logic out of mainframes, RPG, COBOL, and stored-procedure-heavy databases into modern services without losing the business rules embedded in them.
Data migration and parallel-run reconciliation
Data is usually the hardest part. We design parallel-run reconciliation so cutover is a decision, not a guess.
Typical pod
Who actually shows up to do the work.
- Modernization architect
- Senior backend engineer
- Data engineer
- Platform / SRE engineer
- Quality engineer
Time to value
Realistic timelines, not sales-deck timelines.
Modernization assessment in 2–4 weeks. First production traffic on the new path in 8–12 weeks.
Ecosystem we work with
Technologies and platforms we have engineering depth in.
We do not list logos for partnerships we do not formally hold. The list below reflects platforms we have built and run on, not vendor relationships.
- AWS, Azure, Google Cloud
- Kubernetes, ECS, Cloud Run
- Postgres, MySQL, Oracle, SQL Server, DynamoDB
- Kafka, EventBridge, Pub/Sub
- Java, .NET, Python, Go, Node.js
Industry context
How this service shifts by industry.
Banking & Financial Services
Modernization in BFSI is gated by regulatory rigor. We sequence by audit risk, not just engineering ease.
Insurance
Policy-admin replacements compress decades of business rules. We extract them as testable artifacts before rewriting.
Manufacturing
OT-adjacent systems can't afford downtime. We design migrations around plant calendars, not engineering convenience.
Engagement models
How clients buy this work.
Modernization assessment
Two to four weeks of senior engineering time. Fixed scope, fixed price, working artifact at the end.
Sequenced migration
Multi-quarter engagement structured around the sequencing we agreed in the assessment. Outcomes-based milestones.
Modernization-as-managed-service
Long-horizon engagement where the same engineers stay close to the system through the entire transition and into the run model.
Frequently asked
Questions we tend to get.
Bring us the system, the constraints, and the timeline.
Most engagements start with a working session — not a sales pitch. We will be back to you within two business days, with a senior engineer or partner on the call.
- For RFPs and assessmentsrfp@dezynum.com
- Direct linehello@dezynum.com