Open to opportunities

Amin Mortezaie

@aminmortezaie

Message

I build reliable Go payment systems for millions of users.

Armenia

Message

What I'm looking for

I'm open to relocating to the EU with visa sponsorship and want to build reliable, high-scale payment and distributed systems in Go.

I'm designing card authorization and settlement systems at Mili Gold, powering a gold-backed payment card for 25M+ registered users. I built atomic waterfall debit logic with PostgreSQL row-level locking and helped maintain a 98%+ authorization success rate.

I redesigned Mili Gold's withdrawal settlement engine from 34 states to 8 using Kafka exactly-once delivery and PostgreSQL idempotency keys, ending daily blocked-transaction firefighting. I've also improved a PostgreSQL query from four minutes to under one second, built an atomic Redis leaderboard, and delivered an LLM document-processing feature that reduced manual data entry by roughly 40%.

Previously at AbanTether, I built Go wallet services for 1M+ users, including a sub-10ms p99 real-time balance service across eight blockchain networks. I replaced third-party wallet services, cutting monthly spend by roughly 90%, eliminated wallet fraud incidents after launch, and moved reliability-critical withdrawal processing from Python to Go to prevent double-spends.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Mili Gold

Nov 2023 - Present (2 years 10 months)

Owned system architecture and API design across core services, including the Milli Card pipeline and withdrawal settlement engine redesign. Redesigned the settlement engine using Kafka exactly-once delivery and idempotency keys, ending daily blocked-transaction issues.

Go Kafka PostgreSQL gRPC Redis Lua Docker Kubernetes AWS GitHub Actions Caddy Grafana Linux Domain Driven Design Hexagonal Architecture SOLID

Backend Engineer

AbanTether

Feb 2022 - Nov 2023 (1 year 9 months)

Designed and built the wallet backend's interservice API using gRPC and Kafka patterns with DLQ and circuit breaker. Built the real-time balance retrieval service in Go with per-network goroutine worker pools, achieving sub-10ms p99 for 1M+ users.

Go Gin Sqlx gRPC Kafka PostgreSQL Redis MongoDB Elasticsearch Docker Kubernetes AWS GitHub Actions Caddy Grafana Linux HMAC Concurrency Worker Pools Buffered Channels Context Cancellation Hexagonal Architecture

Backend Engineer

NuraFinTech

Mar 2020 - Feb 2022 (1 year 11 months)

Built the trade audit pipeline in Go with append-only immutable records for full traceability. Used the transactional outbox pattern to achieve zero-loss guarantees across banking integrations.