Solution Architect & Senior Software Engineer based in Bangkok, Thailand, specializing in enterprise integration. I design and build enterprise integration platforms for Telecom, Banking and Government sectors — microservices, digital signatures, Open Banking payment initiation, and regulatory document processing.
| Area | Technologies |
|---|---|
| Languages | Java 17/21, Python |
| Frameworks | Spring Boot, Spring Cloud, Apache Camel |
| Messaging | Apache Kafka |
| Databases | PostgreSQL, MongoDB |
| Integration | ebXML/ebMS 2.0, REST APIs, Open Banking RW API v4.0.1 |
| Digital Signatures | XAdES, PAdES, CSC API v2.0 |
| Payment Standards | ISO 20022, FPS (pacs.008/pacs.002), BC-FIPS |
| DevOps | Docker, Kubernetes |
A production-grade microservices platform for processing, digitally signing, and submitting Thai e-Tax documents (Tax Invoice, Invoice, Receipt, Debit/Credit Notes, Cancellation Notes) to Thailand's Revenue Department via ebXML.
- Saga orchestrator coordinating distributed transactions across 22 microservices
- Transactional outbox with Debezium CDC for reliable event delivery
- XAdES/PAdES digital signatures via CSC API v2.0
- PDF/A-3 generation with embedded XML for archival compliance
- Supports 7 Thai e-Tax document types
Core Libraries
| Repository | Description |
|---|---|
| teda | Thai e-Tax Invoice JAXB library with database-backed code lists |
| saga-commons | Shared saga orchestration library |
| eidasremotesigning | Remote Signing Service via CSC API v2.0 |
Document Intake
| Repository | Description |
|---|---|
| document-intake-service | Document intake & validation |
Processing Services (6)
| Repository | Description |
|---|---|
| invoice-processing-service | Invoice processing |
| taxinvoice-processing-service | Tax Invoice processing |
| receipt-processing-service | Receipt processing |
| cancellationnote-processing-service | Cancellation Note processing |
| debitcreditnote-processing-service | Debit/Credit Note processing |
| abbreviatedtaxinvoice-processing-service | Abbreviated Tax Invoice processing |
Signing Services
| Repository | Description |
|---|---|
| xml-signing-service | XML digital signatures (XAdES) |
| pdf-signing-service | PDF digital signatures (PAdES) |
PDF Services (6)
| Repository | Description |
|---|---|
| invoice-pdf-generation-service | Invoice PDF/A-3 generation |
| taxinvoice-pdf-generation-service | Tax Invoice PDF/A-3 generation |
| receipt-pdf-generation-service | Receipt PDF/A-3 generation |
| cancellationnote-pdf-generation-service | Cancellation Note PDF/A-3 generation |
| debitcreditnote-pdf-generation-service | Debit/Credit Note PDF/A-3 generation |
| abbreviatedtaxinvoice-pdf-generation-service | Abbreviated Tax Invoice PDF/A-3 |
Storage & Downstream
| Repository | Description |
|---|---|
| document-storage-service | Document archive (MongoDB/S3) |
| notification-service | Email/webhook notifications |
| ebms-sending-service | ebXML submission to Revenue Dept |
| orchestrator-service | Saga orchestration coordinator |
A production-grade microservices platform implementing the UK Open Banking Read/Write API v4.0.1 specification for Payment Initiation Service Provider (PISP) flows. 18 microservices in a flat multi-module Maven monorepo covering domestic, international, scheduled, and standing-order payment workflows with full consent management.
- Hexagonal architecture (ports + adapters) across all services with domain/application/adapter/infrastructure layers
- ISO 20022 payment rails via Prowide-based FPS adapter (pacs.008 outbound, pacs.002 inbound) with end-to-end instruction traceability
- Saga orchestration with Kafka outbox pattern for reliable domain-event delivery (
pisp.domain-events,pisp.saga-commands) - Security filter chain: RawBodyCaching, BearerToken, MutualTLS, Idempotency, JWS verification, GrantType enforcement, ResponseSigning
- BC-FIPS ready: Optional
bcfips-integrationMaven profile activates Bouncy Castle FIPS PS256 signing - Comprehensive test strategy: Domain unit tests, application slice tests,
@DataJpaTestpersistence,@SpringBootTestREST, and RestAssured + Testcontainers E2E
Payment Initiation
| Service | Description |
|---|---|
| domestic-payments | Domestic payment initiation with FPS rail adapter |
| international-payments | International payment initiation |
| file-payments | File-based bulk payment initiation |
Scheduled Payments
| Service | Description |
|---|---|
| domestic-scheduled-payments | Future-dated domestic payments |
| international-scheduled-payments | Future-dated international payments |
Standing Orders
| Service | Description |
|---|---|
| domestic-standing-orders | Recurring domestic payments |
| international-standing-orders | Recurring international payments |
Consent Management
| Service | Description |
|---|---|
| domestic-payment-consents | Domestic payment consent authorisation |
| international-payment-consents | International payment consent authorisation |
| file-payment-consents | File payment consent authorisation |
| domestic-scheduled-payment-consents | Domestic scheduled payment consent authorisation |
| international-scheduled-payment-consents | International scheduled payment consent authorisation |
| domestic-standing-order-consents | Domestic standing order consent authorisation |
| international-standing-order-consents | International standing order consent authorisation |
Infrastructure & Fee Engine
| Service | Description |
|---|---|
| saga-orchestrator | Distributed saga coordination |
| event-notification | Cross-cutting event notification |
| fee-engine | Fee calculation engine |
| fee-engine-demo | Fee engine demo frontend |
| fee-engine-admin-ui | Fee engine admin UI |
| fee-engine-ai-assistant | AI-powered fee engine assistant |
A microservices platform implementing the ETDA (Thailand) Digital Academic Transcript standard — ingesting transcript XML, validating against schema + Schematron business rules, driving multi-party approval + signing sagas (registrar → dean → university seal), and rendering PDF/A-3b documents with the sealed XML embedded.
- Saga orchestration with a transactional outbox (Camel-relayed
outbox_event→ Kafka) - XAdES/PAdES digital signatures via CSC API v2.0 (eidasremotesigning)
- PDF/A-3b generation with embedded sealed XML, conformance gated by veraPDF
- Hexagonal architecture across all services (Java 17/21, Spring Boot)
- Crash-safe signing with explicit transaction boundaries (TX1 / TX1.5 / TX2) and idempotent replay
| Repository | Description |
|---|---|
| transcript-lib | JAXB bindings + Schematron + codelist JPA |
| transcript-saga-commons | Shared saga + transactional-outbox library |
| transcript-processing | REST intake & source-XML ingestion |
| transcript-orchestrator | Saga orchestrator (batches) |
| transcript-signing | XAdES (XML) + PAdES (PDF) signing |
| transcript-pdf-generation | Sealed XML → PDF/A-3b |
| transcript-approval-ui | React 19 + Vite SPA — registrar/dean approval UI & monitoring |
| e2e-harness | Cross-service E2E + compose topology |
Connect with me on LinkedIn if you're working on e-government integration, digital signature implementations, telecom service delivery platforms, Open Banking payment initiation, or ISO 20022 payment systems.