Legacy App Modernization in Seattle for Aerospace, Maritime and Healthcare

ZTABS modernizes legacy applications for Seattle enterprises in aerospace, maritime, healthcare and municipal government. Seattle's aerospace manufacturers operate legacy MES and quality systems critical to commercial and defence aviation programmes. Port operations run legacy terminal management platforms. Healthcare providers maintain departmental systems on aging technology. ZTABS is remote-first by design from our Houston, Texas office.

Seattle's legacy modernization demand spans aerospace MES systems approaching vendor end-of-support, maritime and port operations platforms unable to handle modern logistics requirements, healthcare applications needing EHR integration, municipal permitting systems requiring citizen digital access, and enterprise cloud migration for growing technology companies.

Legacy app modernization in Seattle at a glance

Need	What we build	Key requirement
Aerospace	MES and quality systems	AS9100, ITAR, traceability
Maritime	Port operations platforms	24/7 continuity, cargo data
Healthcare	EHR integration	HIPAA, MHM compliance
Municipal	Permitting modernization	Citizen UX, records
Enterprise	Cloud migration	Scaling, team autonomy

Aerospace manufacturing modernization

Seattle aerospace companies operate legacy MES, quality management and configuration control systems for commercial and defence aviation programmes. AS9100 quality management requirements, ITAR defence article and technical data handling where applicable, and programme-specific traceability make modernization particularly complex.

MES modernization. Replacing legacy manufacturing execution systems with modern platforms supporting IoT sensor integration, real-time quality monitoring and advanced analytics. Complete lot genealogy and manufacturing history preserved. Traceability maintained from raw material to delivered product.

Quality system modernization. Legacy quality management systems replaced with modern platforms integrated with MES and ERP. Nonconformance tracking, corrective action management, supplier quality data and first article inspection reports modernized. AS9100 organisational QMS applied to programme and contract scope. Audit trail preserved.

Configuration management. Legacy configuration control systems with decades of part and assembly data migrated to modern PDM and PLM platforms. Engineering change history preserved. Bill of materials accuracy verified through automated reconciliation. Configuration baselines maintained for each programme.

ITAR compliance. ITAR covers defence articles, defence services and technical data on the US Munitions List, not a synonym for all controlled unclassified information. Cloud infrastructure for ITAR-controlled data must meet specific hosting requirements. This engagement scopes actual personnel, customer data and approved access for the specific programme. ITAR is neither a blanket cloud certification nor an automatic all-clearance requirement. Hypothetical commercial aviation components are not automatically ITAR-controlled.

Maritime and port operations modernization

Seattle port terminal operators maintain legacy cargo tracking, vessel scheduling and gate management systems on aging platforms.

Terminal management. Legacy terminal systems replaced with modern platforms enabling automated gate processing, real-time vessel tracking, API-based customer integration and container yard optimisation. Modernization planned with agreed operational windows, rehearsed cutover, validated controls and documented residual continuity risk.

Vessel scheduling. Legacy berth planning and vessel scheduling systems modernized with real-time AIS integration, weather-based scheduling and pilot coordination. Historical vessel and berth data preserved.

Intermodal connectivity. Legacy rail and truck coordination systems modernized for real-time intermodal visibility and automated handoff tracking between ocean, rail and truck modes.

Healthcare system modernization

Seattle healthcare providers maintain departmental applications needing EHR integration and MHM compliance.

Departmental replacement. Legacy lab, pharmacy and radiology systems replaced with EHR-integrated solutions. Patient data migrated with HIPAA-compliant handling. Clinical workflow continuity maintained.

MHM compliance. My Health My Data applies to consumer health data with specific data exemptions, not a blanket HIPAA entity exemption. Breach notification must be made most expediently without unreasonable delay, not exceeding 30 calendar days after discovery, subject to actual exceptions. Legacy systems holding consumer health data modernized with MHM-compliant consent, access and deletion capabilities.

Clinical decision support. Legacy rule-based systems upgraded to modern platforms. Integration with genomics data for precision medicine programmes at Seattle research hospitals. Human clinical judgment essential.

Municipal permitting modernization

Seattle municipal agencies operate legacy permitting systems needing citizen digital access.

Permitting platform. Legacy systems replaced with modern platforms enabling online application submission, automated review routing, electronic plan review and inspection scheduling. Historical permit records migrated with full application, review and inspection history.

Code enforcement. Legacy code enforcement systems modernized for mobile inspection, automated workflow and citizen complaint tracking. Historical violation and compliance records preserved.

Washington state regulation

MHM scope. My Health My Data applies to consumer health data with specific data exemptions, not a blanket HIPAA entity exemption. Government and tribal entities and contractors processing on behalf of government are excluded from the definitions of person and regulated entity under RCW 19.373.010. Collection requires consent or necessity for a requested service, and sharing separately requires consent or necessity for a requested service, with sale requiring distinct authorisation.

B and O tax. Washington B and O tax uses MATC (multiple activities tax credit) on actual same-product double-tax conditions and eligible activity, not a universal input-use tax credit or automatic software application credit. Billing and accounting systems must implement correct B and O methodology for service classification and tax calculation based on actual eligible activities.

Strangler fig for aerospace systems

Seam selection. Aerospace MES seams: production scheduling, work order management, quality inspection, lot tracking, equipment integration. Each function extracted with independent validation. AS9100 audit trail continuity maintained at each extraction.

Single authoritative write. One system authoritative for each lot, work order and inspection record during coexistence. Manufacturing dual-write is dangerous given traceability and quality requirements. CDC with conflict detection for cross-system reconciliation.

Data mapping. Types, nulls, time zones, units, identifiers, encoding, history, retention and crosswalks. Aerospace-specific: part numbers with revision and configuration, lot and serial numbers with genealogy, inspection records with disposition codes and engineering specifications with effectivity.

Cutover rehearsal. Observable acceptance with measurable targets. Aerospace cutover timed for programme milestones and production schedule boundaries. AS9100 audit trail must demonstrate continuous compliance through transition.

Application archaeology

Reverse-engineering business rules from legacy MES, quality and configuration management code. Aerospace systems accumulate decades of programme-specific business rules, customer requirements and regulatory interpretations. Each rule documented, validated with manufacturing engineering and quality staff, and categorised.

Business rules discovered with users through representative production scenarios. Manufacturing workflows validated against actual shop floor operations. Quality procedures verified against AS9100 and programme-specific requirements. ITAR handling procedures verified against programme security requirements.

Cost and timeline

Legacy system modernization follows the published cost guide.

Tier	Range	Timeline	Example
UI Modernization	$40K to $100K	8 to 16 weeks	New frontend, API wrapper, improved UX
Re-Platforming	$100K to $250K	16 to 32 weeks	Modern stack, containerization, cloud, data migration
Re-Architecture	$250K to $400K	8 to 14 months	Decompose monolith, event-driven, modern data layer
Full Rebuild	$400K to $500K+	12 to 18+ months	Ground-up rebuild with agreed availability target, rehearsed staged cutover and maintenance windows

Vendor comparison

These 2026 US-buyer planning ranges illustrate re-platforming a 10 to 15 year old business-critical system using a strangler fig approach, modern stack, API wrappers, phased data migration and regression harness. They are guide-based illustrations, not empirical market surveys or independent local quotes.

Vendor route	Typical cost	Timeline
Freelance or dev collective	$40K to $130K	5 to 12 months
Offshore systems integrator	$60K to $200K	8 to 14 months
ZTABS	$100K to $280K	6 to 12 months
Large consultancy	$300K to $1M+	10 to 18 months
SaaS replacement (where a vendor fits)	$50K to $200K implementation	4 to 9 months

The published guide estimates that parallel-running infrastructure, knowledge-transfer time from senior staff and where applicable compliance revalidation combined add $100K to $500K or more as a scope-dependent planning allowance regardless of vendor path. Not every project requires all categories, and actual costs depend on parallel-run duration, revalidation scope and whether infrastructure is shared. Selected licences, vendor contracts, data cleansing, dual-run support and revalidation boundaries apply per engagement scope.

Proposal evaluation criteria

Use these criteria when evaluating any vendor proposal for this engagement, including ZTABS:

Criterion	What to verify
Strategy, deliverables and acceptance	Agreed modernization approach with keep, upgrade, configure or replace alternatives for each system and documented acceptance criteria
Data source-of-truth and reconciliation	Which system is authoritative for each object and period, CDC and reconciliation design evidence, data ownership boundaries
Rehearsal, cutover and rollback	Phased rehearsal with actual maintenance windows, rollback feasibility after new writes and schema changes, record and control validation with approved RTO and RPO
Security, privacy and compliance	Access, safety and compliance evidence during and after migration, exception register with owner acceptance, residual risk documentation
Full recurring costs	Licences, parallel-run infrastructure, third-party vendor, support, data cleansing and revalidation costs separately itemised
Human roles and responsibility	Trainer, validator and support responsibility split, agreed staff languages, documentation, review, translation and onsite terms

Inventory and discovery

Seattle enterprise modernization begins with complete inventory: applications, users, scheduled jobs, database procedures, reports, file and EDI dependencies, vendor contracts, supported versus end-of-life versions. Aerospace manufacturers commonly have legacy systems accumulated over decades of programme deliveries with programme-specific business rules and customer requirements embedded in code.

Business rules discovered with users through representative production scenarios. Manufacturing workflows validated against actual shop floor operations. Quality inspection rules verified against AS9100 procedures and programme specifications. Maritime operations validated against vessel scheduling and cargo handling procedures.

Integration and dependency management

Aerospace integrations. Customer programme data exchange, supplier quality data sharing, MRO part ordering and FAA reporting. ITAR data handling requirements for each integration. Each interface documented and migration coordinated with programme stakeholders.

Maritime integrations. Vessel AIS feeds, terminal operating system connections, rail and truck dispatch interfaces, customs filing systems and customer portal APIs. Each integration supporting 24/7 port operations.

Healthcare integrations. HL7, FHIR and legacy proprietary interfaces. EHR integration testing with actual clinical scenarios. Lab instrument interfaces, pharmacy dispensing and radiology information systems.

Authentication versus authorisation. Authentication identity distinct from programme-level, export-classification-level and role-level authorisation. Aerospace systems require programme-specific access controls with eligible personnel and customer programme access verified. Classified facility clearances and personnel security clearances apply only where the actual programme classification requires them, not for all unclassified ITAR-controlled activity.

Logs and retention

Logs minimise and redact secrets and regulated payloads with actual retention and legal holds. Aerospace quality records retained per AS9100, customer contract and FAA requirements. ITAR access logs retained per compliance requirements. Maritime operational records retained per Coast Guard requirements.

Handover

Modernization handover includes runbooks, data lineage, licensing, support contacts and accountable owners. Aerospace handover includes AS9100 documentation, ITAR data handling procedures, programme-specific configuration and manufacturing engineering specifications.

How delivery works

ZTABS is remote-first by design from our Houston, Texas office. Pacific time alignment managed through agreed overlapping work hours. Aerospace programmes often have strict communication and documentation requirements.

Assessment. Application archaeology, AS9100 compliance mapping, ITAR data analysis and modernization strategy. Programme-specific requirements documented.

Incremental migration. Strangler fig extraction phased around programme milestones and production schedule. Each extraction maintaining AS9100 audit trail continuity and ITAR compliance.

Cutover and decommission. Documented rollback plans. Production cutover timed for schedule boundaries. Legacy decommission with data archived per programme and regulatory retention requirements.

Modernization approach selection

Seattle enterprises need clear criteria for choosing between approaches.

Targeted remediation. Adding capabilities to otherwise functional systems. Example: adding IoT sensor integration to legacy MES while keeping core production scheduling.

Re-platforming. Moving to modern infrastructure. Example: migrating legacy MES from on-premises to cloud while preserving manufacturing logic and lot genealogy.

Re-architecture. Decomposing monolith into services. Example: extracting production scheduling, quality inspection and equipment management as independent services from monolithic MES.

Full rebuild. Ground-up development. Example: replacing a legacy municipal permitting system on unsupported platform with modern cloud-native application.

SaaS replacement. Replacing custom with commercial products. Low build risk but high fit risk for programme-specific aerospace workflows.

Data type mapping for aerospace

Aerospace manufacturing data has unique types requiring careful migration planning. Part numbers with revision levels, configuration baselines and effectivity ranges. Lot numbers and serial numbers with complete genealogy and material certifications. Inspection records with disposition codes, buy-off signatures and measurement data. Engineering specifications with programme-specific requirements and customer flow-downs. Tool calibration records with due dates and measurement uncertainty. Nonconformance records with disposition, corrective action and customer notification.

Cutover rehearsal

Observable acceptance with measurable RTO, RPO and latency targets. Aerospace cutover timed for programme milestones and production schedule boundaries. Maritime cutover timed for vessel schedule windows. Municipal cutover coordinated with fiscal year boundaries.

Rollback feasibility assessed after schema, data and contract changes. Manufacturing lot status changes, quality dispositions and vessel scheduling changes may not be automatically reversible. Compensations can require engineering, programme management or regulatory review.

Risks and mitigations

AS9100 audit trail gaps. Continuous compliance documentation through transition. Quality records preserved at every stage. Pre-cutover audit trail verification.

ITAR data exposure. Access controls verified at every migration stage per actual export classification. Cloud infrastructure meets hosting requirements for the classified or controlled data scope. Personnel access verified against actual export authorisation, eligible-person status and customer programme access requirements.

Production disruption. Parallel operation maintains manufacturing continuity. Cutover timed for production boundaries. Documented rollback procedures tested before production migration.

Maritime operational continuity. Port operations run 24/7. Terminal system cutover planned for lowest-activity windows with rollback feasibility assessed per agreed RTO and RPO. Post-new-write rollback may require reconciliation, compensation and operations-engineering approval rather than automatic undo.

When ZTABS is not the right fit

These describe the boundaries of this proposed modernization engagement, not company-wide limitations.

• The system still works and nobody is asking for changes. Wait for a real forcing function.
• Classified programme systems. This engagement scopes actual personnel, customer data and approved access for the specific programme. Classified systems require specific facility and personnel clearances under a separately scoped arrangement.
• On-site embedded team. ZTABS is remote-first by design. If the engagement requires permanent on-site staff, a separately scoped arrangement would apply.
• AS9100 or ITAR certification advisory. This engagement builds platforms, not certification advisory. Certification advisory is a separately scoped professional service.

White-label AI products

ZTABS builds custom white-label AI products for clients to brand and resell. Seattle aerospace and technology companies can commission white-label AI platforms for distribution under their own brand.

Enterprise cloud migration

Seattle technology companies migrating legacy applications to cloud-native architecture. Containerisation, Kubernetes orchestration, CI/CD automation and infrastructure as code. Database migration from legacy relational to modern data platforms. Legacy authentication and session management replaced with modern identity providers. Cloud cost optimisation through right-sizing, reserved instances and spot instances for non-critical workloads. Legacy monolith performance baselines established before migration for comparison.