# Min Joo Kang **Senior Software Engineer** — Singapore, Singapore > I'm a Senior Software Engineer specializing in backend & distributed systems for financial infrastructure, where correctness, reliability and auditability are the product. The system cannot lose a cent or pay a user twice. In 5+ years I’ve worked across the full financial transaction lifecycle — multi-market investment, trading, brokerage, settlement, custody and bank treasury integrations at Endowus, and payments, digital wallets, and ledgers at Paywatch. The challenges I thrive on sit where distributed systems meet real money movement — keeping financial state consistent across async workflows, external providers, idempotency, concurrency and explicit failure recovery. At Endowus — now Asia's leading digital wealth platform with S$16B+ in assets — I joined as its 6th engineer / 18th employee and helped establish the Trading team’s foundation with the Engineering Manager as the company scaled to 80+ engineers. I built core parts of its multi-broker, multi-currency platform in Singapore and Hong Kong: event-sourced trading workflows, order netting, clearing & settlement, custody & cash ledgers, and brokerage, banking & fund-platform integrations (UOBKH, HSBC Treasury, AllFunds). I led the UOB-to-HSBC banking migration that cut deposit reflection from 2–3 business days to under 5 minutes. I was promoted from Intern to Software Engineer II in 18 months on “Outstanding” ratings. At Paywatch, a Singapore-headquartered earned-wage-access fintech across 6 Asia-Pacific markets, I’ve led the backend architecture for a prepaid wallet and transaction ledger, and spearheaded the evolution of a Python/Django monolith into a Kotlin/Spring Boot event-sourced CQRS platform — outbox, CDC backfill, DLQ recovery and re-projection tooling. More recently I’ve built AI-assisted infrastructure that boosted team productivity: an MCP integration layer across financial & operational systems, and an internal agent that cut first-pass incident MTTR by 60%. Earlier I co-founded a seed-funded healthcare IT startup as co-CEO. Building a product from zero to launch shaped how I work today — start from the business problem, understand the domain deeply, and architect resilient systems end-to-end, from ambiguous requirements to scalable, reliable production. Core: Distributed Systems · Event-Driven Architecture · DDD · Microservices · Event Sourcing · CQRS Financial Systems: Payments · Ledger · Digital Wallets · Trading & Brokerage · Settlement & Reconciliation · Custody & Treasury Singapore Permanent Resident — no work pass required. Career Archetype: **Junction Trailblazer** (HE-MG) — One of the first Junction Trailblazers on Saywise ## Links - LinkedIn: https://linkedin.com/in/min-joo-kang ## Experience ### Senior Software Engineer, Paywatch (2024-12 – present) Seoul, South Korea · Singapore-headquartered earned-wage-access FinTech operating across 6 Asia-Pacific markets, serving 350K+ employees at 300+ enterprise clients. Posted overseas from Singapore HQ to support regional engineering operations. I work on the Korea platform: ~US$80M disbursed across 515K+ salary advances, 1.86M API requests per month at 99.98% success. Prepaid Wallet & Financial Ledger — Own backend architecture and end-to-end delivery of PayWatch Money, evolving direct salary-advance withdrawals into a prepaid-wallet and provider-conversion platform; designed the financial domain model, ledger, APIs, lifecycle batch jobs, operational tooling and payout provider integrations. Correctness Under Concurrency — Designed a high-correctness financial ledger and transaction model with FIFO funding-lot attribution and concurrency controls for traceable money movement including pessimistic locking, deterministic lock ordering, idempotent execution, and failure recovery. Event-Sourced Platform & Reliability — Led the migration of legacy Python/Django domains toward Kotlin/Spring Boot/Axon Event Sourcing & CQRS architecture with Kafka, Transactional Outbox, DLQ recovery, CDC-based migration, and aggregate re-projection tooling. AI-Augmented Engineering — Architected an MCP integration layer exposing 41 tools across 11 financial domains, providing governed access to event-sourced and legacy systems for internal and customer-facing AI agents. Extended Hermes, a Slack-native AI engineering agent integrating engineering knowledge, repository context, production telemetry, AWS, Kafka events, Git history and live system state for source-cited engineering Q&A and incident investigation; reduced first-pass incident MTTR by 60%. Tech: Kotlin · Spring Boot · Axon · Kafka · Python · Django · MySQL · Redis · Celery · AWS · MCP ### Software Engineer II — Backend, Trading & Cash Management, Endowus (2020-11 – 2023-04) Singapore · MAS-licensed digital wealth platform managing S$16B+ in assets. Joined early-stage as its 6th engineer / 18th employee and helped establish the early Trading team’s engineering foundation with the Engineering Manager as the company scaled to 80+ engineers / 250+ employees. Promoted from Intern → Software Engineer I → Software Engineer II within 18 months on “Outstanding” performance ratings. Multi-Market Brokerage & Custody — Architected and built core components of Endowus’ brokerage and custody platform supporting its Hong Kong expansion. Built multi-currency custody and cash-management ledger flows across master, virtual, customer and operating accounts. Event-Sourced Trading Engine — Engineered event-sourced trading workflows across internal orders, external trades and settlement orchestration across fund and cash positions using Scala/Akka, Kafka event streaming, persistent event journals and CQRS read models. Partner Integrations — Integrated UOBKH, HSBC Treasury and AllFunds dealing infrastructure. Streamlined dealing, order netting and settlement reconciliation pipelines across the full trade execution lifecycle. Engineering Culture — Led technical onboarding and domain knowledge transfer for incoming senior/staff engineers joining from FAANG and global investment banks. Tech: Scala · Akka · Lagom · Kafka · Cassandra · PostgreSQL · Event Sourcing · CQRS · DDD · Python · Apache Airflow · Kubernetes · CI/CD · ELK · GCP/AWS ### Software Engineer Intern, Endowus (2020-01 – 2020-03) Singapore · Built a stock-trading prototype while ramping up on Scala, Akka, Kafka, Cassandra, DDD and Event Sourcing/CQRS; identified and fixed an edge case that omitted transactions from external broker settlement files. Received a full-time return offer. ### Co-Founder & Co-CEO, JellyLab co.,Ltd (2017-06 – 2018-08) Seoul, South Korea · Co-founded and led a healthcare technology startup from zero to launch, building a clinician-facing analytics product on patient chatbot data. Led business strategy and zero-to-one product development and secured seed funding from BluePoint Partners and Digital Healthcare Partners (DHP). ## Education ### Bachelor's degree in Computer Science, Korea Advanced Institute of Science and Technology (2014-09 – 2021-02) National Science & Engineering Scholarship (Full Tuition) ### International Baccalaureate (IB) Diploma & Bilingual Diploma in STEM, Overseas Family School, Singapore (2008-02 – 2014-06) Higher Level Math and Physics (Academic Distinction Awards - Grade 42/42) - Educated in Singapore from secondary school ## Skills Distributed Systems, Microservices, Backend Development, System Design, Software Architecture, Event-Driven Architecture, Software Engineering, Domain-Driven Design (DDD), Event Sourcing, CQRS, Concurrent Programming, Computer Science, Functional Programming, Kotlin, Java, Python, Scala, C, C++, Akka, Spring Boot, Django, Axon, Apache Kafka, Cassandra, MySQL, PostgreSQL, Amazon SQS, Redis, Celery, Apache Airflow, Amazon Web Services (AWS), Google Cloud Platform (GCP), Continuous Integration and Continuous Delivery (CI/CD), Kubernetes, Docker, Elastic Stack (ELK), Sentry, Prometheus, Grafana, javascript, Node.js, React.js, Model Context Protocol (MCP), Financial Infrastructure, Financial Services, Asset Management, Trading Systems, Brokerage, Custody ## Credentials - **3rd Place Final Round & DeFi (Decentralized Finance) Category** — Cosmos HackAtom Seoul (issued 2019-07) --- Source: https://saywise.com/member1558 (last modified 2026-10-12T11:50:56.042Z)