Building digital identity infrastructure you can rely on — at scale, under regulation, without downtime.
📍 Luxembourg · 🇰🇷 Korea | 🏢 Hopae | 🌐 Open Wallet Foundation | ✍️ blog.lukasjhan.com
Republic of Korea Air Force, honorably discharged as Staff Sergeant.
| 🏗️ Current Role | Staff Infrastructure Engineer @ Hopae — owning the full platform end-to-end: architecture, SRE, and R&D leadership |
| 📦 Open Source Impact | Maintainer of SD-JWT JS · 6M+ npm downloads · first project to graduate OWF Lab → Growth Stage |
| 🔐 Specialization | Digital Identity · Verifiable Credentials · Regulated Cloud Platforms (EU) |
| 🌍 Standards Work | Maintainer of SD-JWT / SD-JWT VC (OWF) · Contributor to OpenID4VP, ISO 18013-5, DCQL |
SD-JWT JS — Open Wallet Foundation
The reference TypeScript implementation of SD-JWT and SD-JWT VC — powering production digital identity wallets across Europe and beyond.
- First project to graduate from OWF Lab → Growth Stage
- Implements the latest SD-JWT and SD-JWT VC specifications
- Deployed in EUDI Wallet ecosystem implementations
- 6M+ total downloads on npm
MDL JS — Open Wallet Foundation Labs
TypeScript implementation of ISO 18013-5 (mDoc) — the mobile driver's license standard being adopted across the EU and US.
EUDI Wallet Reference Implementation — European Commission
Contributor to the official EU Digital Identity Wallet reference codebase — maintained by the European Commission as the canonical implementation of the eIDAS 2.0 Architecture Reference Framework (ARF).
- DCQL null matching — implemented the missing null-matching semantics of the DCQL specification in the iOS wallet stack, enabling verifiers to query for credentials with optional claims
IATA Digital Identity PoC — International Air Transport Association
Contributing engineer on the official IATA Proof of Concept (Cycle 2) — validating credential-based digital identity across global airline and airport infrastructure, representing Hopae as a listed technology partner.
- Verifying Digital Identity in the Distribution Process — B2B agent verification across NDC distribution networks plus B2C traveler identity via digital wallets
- Contactless Travel — End-to-end contactless travel pilot using wallet-based credentials across airlines, airports, and wallet providers
Partners include Air Canada, British Airways, Qatar Airways, Japan Airlines, Air New Zealand, Hong Kong Int'l Airport, with technology partners Google Wallet, Amadeus, SITA, NEC, Infosys. Standards applied: W3C VC · SD-JWT VC · OpenID4VP · ISO 23220 — the same specifications I maintain and contribute to upstream.
- KRDS React — Component library for the Korean Government Design System
- winston-opensearch — Winston logger transport for OpenSearch
Working at the intersection of EU regulation and technical implementation — where every spec decision carries legal consequences.
| Standard | Role |
|---|---|
| SD-JWT / SD-JWT VC | Maintainer (OWF) |
| ISO 18013-5 / 18013-7 (mDoc) | Maintainer (OWF Labs) |
| OpenID4VP / OpenID4VCI | Implementer |
| DCQL | Implementer |
| eIDAS 2.0 / ARF | Regulatory research & implementation |
| ETSI TS 119 411-8, 119 475 | QTSP compliance |
📄 W3C Translations (Korean):
Blog — blog.lukasjhan.com — monthly writing (EN) on digital identity, trust infrastructure, and engineering culture.
Events & Talks
| Event | When | Role |
|---|---|---|
| IIW — Internet Identity Workshop | Apr 2025 | Presenter — SD-JWT VCLD Implementation |
| OpenWallet Forum @ Davos | Jul 2025 | Participant — global digital identity collaboration |
| IATA Data & Tech PoC WDS 2026, @Singapore | Apr 2026 | Technical contributor — aviation identity innovation |
Reflections on each event are published on the blog above.
Cloud & Infrastructure
Languages
Backend
Data & Messaging
Observability
