Open to opportunities

Rayan User

@rayanuser4

Message

I build high-throughput Golang blockchain custody and USDT payment platforms.

Cambodia

Message

What I'm looking for

I'm seeking Senior Golang or Blockchain Engineer roles focused on MPC custody systems, blockchain infrastructure, distributed systems, and high-throughput payment platforms.

I've built MPC wallet custody, blockchain infrastructure, and high-throughput USDT payment platforms at Loma Technology and Maya Technology. My systems have supported 10–15K active custody users and processed up to 100K daily USDT transactions on TRON.

At Loma Technology, I architected a custodial HD wallet system using MPC, DKG, GG20 threshold signatures, tss-lib, libp2p, and multi-cloud KMS. I designed a fault-tolerant signing architecture with 99.99% uptime, under-30-second failover, and threshold-based reconciliation that reduced operational overhead by 90%.

At Maya Technology, I built Super Fast Pay and White Sand payment platforms, securing HD wallets with cloud AES-256 and on-premises HSM encryption. I improved API latency by 65%, increased throughput from 1K to 3K requests per second, and reduced payment processing time from five minutes to 30 seconds.

I've also delivered e-commerce, logistics, HR automation, algorithmic trading, Android marketplace, ERP, and IT infrastructure systems. I'm seeking senior Golang and blockchain work focused on MPC custody, distributed systems, and high-throughput payment infrastructure.

Experience

Work history, roles, and key accomplishments

Senior Golang / Java / Blockchain Engineer

Loma Technology Co Ltd

Feb 2026 - Aug 2026 (6 months)

Architected a custodial HD wallet system using MPC, DKG, and GG20 Threshold Signatures, serving 10-15K active users with zero security incidents. Built a high-throughput TRON block crawler processing 10K-100K daily USDT transactions.

Go Java GG20 AWS KMS Tron React

Senior Golang / Java / Blockchain Engineer

Maya Technology Co Ltd

Jul 2023 - Feb 2026 (2 years 7 months)

Built backend for internal payment platform serving 5,000+ active users with 10K-100K daily USDT transactions on TRON and 2K+ on Ethereum. Led migration to Go microservices and upgraded runtimes, improving performance by ~30%.

Go Java Tron BSC Ethereum Redis PostgreSQL CQRS Event Sourcing Saga gRPC Kafka

Senior Full Stack Developer

Loma Technology Co Ltd

Oct 2022 - Jun 2023 (8 months)

Built complete OnShop e-commerce platform with 150,000+ downloads and 10,000+ monthly orders. Developed backend for live FX rate matching engine with 96-98% success rate under high TPS.

React PostgreSQL iOS Android

Full Stack Developer

Sourceland Technologies

Aug 2021 - Oct 2022 (1 year 2 months)

Designed enterprise logistics platform with automated bidding and smart routing across 4 international markets. Built real-time bidding engine reducing procurement cycle time by ~40%.

React PostgreSQL Redis RabbitMQ

Algorithmic Trading Developer

Freelancer.com

Feb 2020 - Aug 2021 (1 year 6 months)

Developed custom algorithmic trading bots and indicators in MQL4, MQL5, and PineScript, delivering 20+ strategies to global clients.

Pinescript

Android Developer

Prasanavi Digital Solutions Pvt Ltd

Sep 2019 - Jan 2020 (4 months)

Built two-sided Android marketplace app connecting clients with 20 nearby print shops, onboarding 300+ users with a 4.8/5 rating.

Android Marketplace

Software Engineer

EExcellency Software Solutions Pvt Ltd

Sep 2016 - Sep 2019 (3 years)

Built ManageEcom seller ERP platform processing 1,000+ daily orders with $500K+ monthly inventory. Developed e-commerce platforms with a zero-code Behavioral Analytics SDK serving 100,000+ DAU.

ERP Behavioral Analytics SDK

IT Support Engineer

HCL Comnet Pvt Ltd

Jul 2014 - Sep 2016 (2 years 2 months)

Managed end-to-end IT infrastructure for 110 supermarkets, providing 24/7 support with 99.9% uptime. Resolved LAN/WAN, server, and POS failures with a 45-minute max resolution time.

IT Infrastructure LAN WAN Server+POS