.NET Framework applications
WebForms, WCF and .NET Framework 4.x systems moved to modern .NET on containers, with the same business rules and a cleaner boundary around them.
Legacy Modernization
Move off legacy .NET and Java.
Without stopping the business.
We migrate monolithic applications to cloud-native platforms incrementally, so revenue keeps flowing while the architecture changes underneath.
Rewrites fail because they stop the business for a year and ship nothing in between. Modernization done right ships every few weeks and never asks customers to wait.
What we modernize
Applications that still run the company but can no longer keep up with it.
Java EE and Spring monoliths
Application-server deployments broken into services along real domain lines, deployed independently and observed end to end.
On-premises databases and batch jobs
Overnight batches and shared databases replaced with managed cloud data stores and event-driven processing, migrated table by table.
Undocumented integrations
File drops, stored procedures and point-to-point connections mapped, contract-tested and replaced with APIs your team can own.
How it works
Strangler pattern, not big bang
New capabilities grow around the legacy system and take over one path at a time. The old system is only switched off when nothing depends on it.
-
Audit and stress test
We map every single point of failure, hidden dependency and bottleneck in the current system, then simulate load on the paths that actually carry revenue.
-
Carve out and migrate
Domains are extracted in order of value and risk. Each slice goes live behind a routing layer, runs in parallel with the legacy path, and is verified against production traffic before cutover.
-
Harden and hand over
Blue/green rollouts, real-time alerting, automated recovery and documentation written for your engineers. When we leave, your team runs the platform without us.
Built for regulated industries
Modernization looks different when auditors, patients or harvest seasons are involved.
Banking, lending and fintech
Core ledgers and payment flows cannot lose a single transaction during migration. We use transactional outboxes, idempotent handlers and dual-run reconciliation so every record is accounted for on both sides before cutover.
- Zero-downtime cutover for payment and settlement paths
- Audit trails preserved across old and new systems
- Segregation of duties and encryption built into the platform
Clinics, labs and health platforms
Patient data moves under strict access rules and cannot be duplicated carelessly. We migrate records with field-level lineage, keep consent and access logs intact, and validate every integration with HL7 and FHIR interfaces before switching.
- Data residency and retention rules enforced at the platform level
- Clinical integrations tested against real message samples
- Role-based access mirrored, then tightened
Agribusiness and cooperatives
Seasonal peaks, remote sites and unreliable connectivity shape the architecture. We design for offline-first field operations, burst capacity at harvest and planting, and integrations with ERPs, weigh stations and traceability systems.
- Elastic capacity for seasonal load without year-round cost
- Sync-safe field apps that survive lost connections
- Traceability data kept consistent from field to invoice
Proven on a bank's core product
At Commonwealth Bank, our founder led the modernization of the Buy Now Pay Later platform, moving it to a cloud-native, serverless architecture on AWS using Clean Architecture and Domain-Driven Design. The product kept serving customers throughout.
About Feneco- Years in production systems
- 25
- Production systems architected
- 25+
- Sectors
- Banking, fintech, SaaS
- Who does the work
- A Solutions Architect. No junior handoffs, no outsourcing.
Questions engineering leaders ask first
Will there be downtime?
No planned downtime. Each migrated slice runs in parallel with the legacy path and is switched over with blue/green routing. If anything looks wrong, traffic goes back to the old path in seconds.
Do we need to freeze feature development?
No. The strangler approach exists precisely so your team keeps shipping. We coordinate on the boundaries being extracted and leave the rest of the roadmap untouched.
How long does a modernization take?
The audit takes two to three weeks and produces a phased plan with an estimate per phase. Most engagements deliver the first slice to production within the first two months and continue in increments from there.
What happens to our data?
Data is migrated in controlled batches with reconciliation on both sides. Nothing is deleted from the source until the new store has been validated under production load, and the whole history remains auditable.
Can our own engineers run the platform afterwards?
That is the goal. Pipelines, runbooks and architecture decisions are documented for your team, and we pair with them during the engagement so the knowledge stays in-house.
Contact
Request an assessment
Tell us about the system you need to move. We reply within two business days with next steps and a scoping call.
Prefer email? hello@feneco.io