PRACTICE DOMAIN // 03 Architecture & Integration
verified_user Zero-Trust Financial Perimeter • dynamic_form Event-Driven & CDC Streaming • cloud_done High Availability Standards
account_tree Enterprise & Systems Advisory

Architecture That Can Be Implemented

Good architecture is not an abstract collection of static diagrams. It creates a clear, executable relationship between strategic business objectives, technical constraints, implementation reality, and mission-critical operational outcomes.

“I help banks, fintechs, and financial institutions translate complex enterprise requirements into hardened, secure, and resilient technology architectures that survive real-world production demands.”

Executive Systems Practice • Makarachi IT Consultancy Inc.
monitoring Target Architecture Telemetry
Verified Metrics
99.999% SLA Availability Target

High-availability target frameworks engineered for zero single point of failure (SPOF) across distributed multi-datacenter clusters.

< 25ms P99 Gateway SLA

Core API mediation P99 latency across distributed gateways, payload schema validations, and synchronous token translation layers.

Zero-Trust Posture Hardened Boundary

Mutual TLS (mTLS), CIAM, and fine-grained Attribute-Based Access Control (ABAC) adhering to Financial-Grade API (FAPI) security profiles.

Multi-Cloud & Hybrid Topology Verified AWS • AZURE • GCP
Core Pillars & Competencies

Comprehensive Architectural Advisory

From high-level enterprise roadmaps to deterministic cryptographic boundaries, we establish architectures structured for scale, regulatory compliance, and rapid modernization.

01 account_balance

Enterprise Architecture

Aligning long-term business capabilities with composable banking technology strategy, capability maps, and technology debt rationalization.

Capability Mapping • Debt Audits
02 architecture

Solution Architecture

Translating high-stakes digital initiatives into hardened, implementable end-to-end technical blueprints with explicit domain boundaries.

DDD • Context Boundaries
03 hub

Integration Architecture

Designing reliable, decoupled communication fabrics connecting legacy mainframes, SaaS cores, and modern channel layers.

EAI • Canonical Formats
04 api

API Architecture & Management

Designing governed, versioned, and secure REST/gRPC service interfaces with distributed rate limiting and developer portals.

OpenAPI • gRPC • Kong/Apigee
05 stream

EDA & Streaming Fabrics

Leveraging Apache Kafka, event sourcing, and Change Data Capture (CDC) to eliminate synchronous transaction bottlenecks.

Kafka • CDC • Event Sourcing
06 cloud_sync

Cloud & Hybrid Banking

Architecting sovereign, multi-region, compliant cloud deployments across AWS, Azure, and Google Cloud with strict data residency.

Sovereignty • Multi-Region DR
07 badge

Identity & Access (IAM / CIAM)

Engineering FAPI (Financial-grade API), OAuth2 / OIDC, mTLS, and customer identity architectures protecting sensitive financial transactions.

FAPI 1.0/2.0 • OAuth2 • Keycloak
08 lock

Security & Resilience

Hardening defense-in-depth perimeters, cryptographic key management (HSMs), DDoS resilience, and automated disaster recovery failover.

HSM Keys • STRIDE • Air-Gap Failover
System Schematic Reference

Resilient Hybrid Banking Integration Fabric

Tier-by-tier reference architecture for non-blocking, multi-channel transactional scale connecting perimeter ingress with core engines.

REAL-TIME BUS ACTIVE
TIER 01: CLIENT CHANNELS & EXTERNAL ECOSYSTEM Ingress Points
Retail Mobile Apps
Corporate Web Portal
Branch Teller Apps
ERP / Treasury Feeds
Fintech Aggregators
Regulatory Clearing
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TIER 02: EDGE SECURITY & ZERO-TRUST FINANCIAL PERIMETER Boundary Defenses
shield Cloudflare WAF / DDoS
lock Mutual TLS (mTLS)
key FAPI OAuth2 / OIDC
manage_accounts CIAM Risk Engine
smart_toy AI Anomaly Inspector
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TIER 03: UNIFIED API GATEWAY & SERVICE MESH Mediation & Governance
Distributed Rate Limiter
OpenAPI Schema Validation
Token Translation (JWT/PASETO)
Circuit Breaker & Fallbacks
Distributed Tracing (OTel)
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TIER 04: ASYNCHRONOUS EVENT FABRIC & CHANGE DATA CAPTURE (CDC) Decoupled Backbone
alt_route Apache Kafka Multi-Cluster
schema Avro / Protobuf Schema Registry
sync_alt Transactional Outbox Worker
replay Dead Letter Queue & Replay
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TIER 05: CORE SYSTEMS & LEDGERS Transactional Records
Core Banking Engine (Mambu / Thought Machine / Temenos)
Real-Time Payment Hub (ISO 20022 Engine)
Sanction Screening & AML Risk Hub
Enterprise General Ledger (GL)
TIER 06: DATA LAKEHOUSE & OBSERVABILITY Analytics & Audit
Immutable Audit Log Fabric (WORM)
Real-Time BI & Regulatory Reporting
OpenTelemetry APM & SIEM Feeds
Operational Data Store (ODS)
Engineering Artifacts

Tangible Architecture Deliverables That Drive Delivery

We produce concrete, battle-tested governance artifacts and blueprints that bridge executive sign-off with engineering execution.

assessment 01. Baseline Audit

Current-State & Tech Debt Baselines

Exhaustive inventory of legacy dependencies, brittle interfaces, protocol obsolescence, and operational risk bottlenecks.

domain 02. Target State

Target-State Blueprints & DDD

Multi-tier target architectures, bounded context diagrams, canonical data dictionaries, and asynchronous event schemas.

history_edu 03. Governance

Architecture Decision Records (ADRs)

Documented rationale, business context, alternatives considered, and trade-off analyses behind irreversible platform choices.

description 04. API Contracts

Integration Specs & OpenAPI Schemas

Version-controlled OpenAPI 3.1 & AsyncAPI specifications, payload validation suites, and mock server definitions.

speed 05. NFR Matrices

Non-Functional & Resilience Matrices

Defines TPS thresholds, P99 latency SLAs, jitter tolerances, RTO/RPO requirements, and automated chaos test criteria.

security 06. Threat Models

STRIDE Threat Models & Cryptography

Data-flow threat assessments, payload tokenization schemes, HSM key rotation topologies, and regulatory privacy controls.

backup 07. Operations Runbook

Multi-Region Cloud DR Runbooks

Automated DNS routing policies, cross-region state synchronization scripts, and split-brain recovery orchestration guides.

timeline 08. Sequencing

Phased Transition Roadmaps

Step-by-step coexistence plans, cutover risk milestones, rollback triggers, and Strangler Fig carve-out scheduling.

Battlefield Insights

Common Architecture Failures & Engineered Remedies

Years of hands-on core transformations reveal predictable failure patterns. Here is how we systematically engineer around them.

warning Failure Pattern

Fragile Point-to-Point Sprawl

Overlapping custom scripts, tight synchronous RPC calls, and high failure propagation between services.

check_circle Engineered Remedy

Canonical Event Mesh & API Gateway Abstraction with managed routing and standard schema definitions.

warning Failure Pattern

Cascading Outages & Coupling

One downstream ledger timeout locks web channels, exhaustion of thread pools, and site-wide crashes.

check_circle Engineered Remedy

Asynchronous Transactional Outbox Pattern combined with distributed circuit breakers and graceful degraded modes.

warning Failure Pattern

Shadow APIs & Permissive Auth

Inconsistent header validation, unrotated internal API tokens, and missing object-level access controls.

check_circle Engineered Remedy

Financial-Grade API (FAPI) Enforcement with centralized CIAM policy engines and continuous mTLS authentication.

warning Failure Pattern

Monolithic Deployment Lockouts

Coordinated releases require weeks of regression testing and multi-hour maintenance outages.

check_circle Engineered Remedy

Domain-Driven Strangler Fig Modernization with decoupled domain microservices and canary deployments.

warning Failure Pattern

Inconsistent Cross-DB State

Distributed transactions split across microservices leading to un-reconciled ledger balances during network drops.

check_circle Engineered Remedy

Distributed Saga Orchestration with idempotent event consumers and automated compensating transactions.

Proven Implementations

Featured Architecture Case Studies

Selected architectural programs engineered and delivered across global retail banking, clearing networks, and payment scale-ups.

View All Case Studies arrow_forward
Core Modernization Tier-1 Retail Bank

Hybrid Event Mesh & Core Batch Decoupling

Migrated legacy synchronous nightly batch pipelines to an active Kafka-based Change Data Capture event fabric. Completely decoupled reporting from core transactional databases.

Key Metric Outcome:
90% Reduction in Peak EOD Lockups
Zero downtime during daily ledger reconciliations
Read Architecture Review arrow_forward
API Security Global Fintech Unicorn

Financial-Grade API (FAPI) & CIAM Modernization

Engineered zero-trust open banking API gateway handling high-velocity partner calls with mutual TLS certificate binding, OAuth2 dynamic client registration, and fine-grained ABAC.

Key Metric Outcome:
40M+ Daily Protected Requests
Zero security perimeter regressions across 18 partner jurisdictions
Read Architecture Review arrow_forward
Cloud Resilience Digital Neo-Bank

Multi-Cloud Active-Active Disaster Recovery

Designed dual-region active-active cloud posture utilizing multi-region CockroachDB clusters and intelligent Anycast routing to withstand catastrophic cloud region outages.

Key Metric Outcome:
RPO = 0 | RTO < 30 Seconds
Successfully passed real-time live traffic chaos test simulation
Read Architecture Review arrow_forward
handshake Direct Advisory Engagement

Need an Independent Architecture Review or Integration Strategy?

Whether you are designing a scalable financial platform, resolving architectural debt, or preparing for high-stakes vendor integration, let's establish a clear, executable technical blueprint.

verified Institutional Mutual NDA Guaranteed • schedule Direct Principal Engagement • gavel Vendor-Neutral Systems Evaluation