Захар

Zakhar Dziuniak
Senior Golang Engineer

PROFILE
Senior Backend Engineer with 6 years of commercial experience, including 6 years focused on
Golang and distributed systems. Specialized in core banking components, transaction processing
engines, and high-load microservice architectures. Experienced in designing scalable APIs for
mobile applications, implementing secure financial flows, and building event-driven systems. Strong
background in cloud-native deployments, performance optimization, and system architecture
design.

CORE EXPERTISE

• Core Banking Systems & Ledger Design
• Transaction Processing & Reconciliation
• Distributed Systems & Microservices
• Event-Driven Architecture (Kafka, NATS)
• High-Load Backend Systems
• REST & gRPC APIs for Mobile Apps
• Cloud Infrastructure (AWS)
• Kubernetes & CI/CD
• Security (OAuth2, JWT, 2FA, Vault)
• PostgreSQL Performance Optimization & Concurrency in Go

EXPERIENCE
NDA Company (Fintech / Core Banking Platform)
Senior Golang Developer | Nov 2022 – Present

• Designed and implemented core banking modules: account management, ledger, double-entry
accounting logic
• Built transaction processing engine with idempotent flows and reconciliation mechanisms
• Developed high-load REST and gRPC APIs for iOS/Android applications
• Implemented event-driven services using Kafka and NATS
• Integrated third-party services: KYC providers, payment gateways, AML systems
• Improved performance of critical financial flows via query optimization and concurrency tuning
• Worked with AWS infrastructure and Kubernetes deployments
• Implemented secure authentication flows (OAuth2, JWT, 2FA)

Detectory
Senior Golang Developer | Jun 2021 – Nov 2022

• Participated in migration from monolith to microservices
• Designed and implemented backend services from scratch
• Developed asynchronous processing pipelines
• Optimized analytical queries (ClickHouse, MongoDB)
• Mentored junior engineers and conducted knowledge-sharing sessions

Earlier Experience
Golang Developer | 2020 – 2021

• Developed backend APIs and business logic for fintech and crypto-related products
• Built inter-service communication via gRPC
• Worked with PostgreSQL, MongoDB, and event-driven messaging systems

EDUCATION
Kyiv Polytechnic Institute — Bachelor’s Degree in Computer Science