About Phu Hiep
With 15+ years of experience, I am a C# .NET and Full-Stack Developer (Android, Web Vue.js, Solid.js, Svelte) specializing in high-performance, mission-critical systems. My career is defined by scaling platforms and leading teams within the Fintech and Banking sectors.
At SGCIB, I maintained a global Credit Checking system processing 1 million daily transactions where millisecond latency was vital. I also rebuilt a high-performance Delivery Risk service that remained in production for several years.
During my 10-year tenure at Lemonway, I helped scale the company through an 800% increase in transaction volume. I progressed from a Senior Developer to Production Manager, leading incident and release management, before becoming Technical Lead for the PaySquad. In this role, I drive the optimization of "Money-In" payment flows, mentor developers, and align cross-squad technical strategies with business objectives.
I combine deep backend expertise with the leadership skills required to manage complex, high-pressure production environments.
Vietnamese
Native or bilingual
French
Fluent
English
Conversational
Can work on-site
Antony (up to 50km)
Experience
- LemonwaySenior Full-Stack .NET Engineer → Tech Lead (IC)January 2016 - January 2025 (9 years)Paris, FrancePayment Service Provider for Marketplaces. Key contributor to a regulated payment platform supporting large European marketplaces.- Designed, developed, and maintained core systems processing ~350,000 transactions/day- Supported PayIn flows up to €433M/month (June 2024)- Built and evolved Money-In pipelines (cards, bank transfers, BNPL, Apple Pay, Google Pay, etc.)- Developed and operated systems under 99.99% SLA- Implemented DDD + CQRS-based architectures across multiple services- Built internal back-office and operational tools used daily by business teams- Worked on wallet management, cash reconciliation, and regulatory workflows- Acted as escalation point for complex production incidentsFull-stack ownership:- Built and maintained multiple SPA applications (Vue, Svelte)- Developed hosted payment components used by external partners- Delivered features end-to-end: API → business logic → UITechnical leadership (IC-focused):- Tech Lead of a 4-person squad (PaySquad)- Previously led a 3-person production team (release, QA, L2, incident response)- Shipped to production up to 2× per week during production management phase- Mentored engineers and drove technical decision-making
- Société Générale CIB (via BK Consulting)Software EngineerJanuary 2013 - May 2015 (2 years and 4 months)Paris, FranceSGCIB consultant – the investment bank of Société Générale. ITEC/CTT/FIC department, the MKS team works on the Electronic Trading platform dedicated to Fixed Income and Foreign Exchange instruments - Verification of user rights and operations risk on the pre-trading step: Java/J2EE, .NET- Built and maintained real-time risk and credit-checking systems processing ~1M transactions/day- Deployed across ~10 nodes (EU, US, UK)- Designed systems under 99.99% SLA- Rebuilt a high-performance delivery risk calculation service (long-term production usage)- Implemented event-driven pipelines using Tibco RDV- Combined real-time cache updates with batch synchronization jobs- Developed access control, pre-trade validation, and rule-based risk engines
- Vectalis.comSoftware EngineerTECHSeptember 2008 - August 2012 (3 years and 11 months)Paris, FranceFinancial software editor: The Inter-Dealer Broker-Trader System (B2T) and a Post-Trade Processing System (called Trade Definition): 90% .NET. R&D «Proof of Concept» development: GWT, GAE, J2EE…My proud experience: "Quote Message Parser" allowing users to copy paste a "natural" chat message to the system, extract important information to create a "Quote" in the system.
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Education
- Master's degreeEcole Polytech'Nice2008Master's degree
- DUT "DiplômeUniversitaire2005DUT "Diplôme