Андрій Ветеран

ANDRII PUHACHENKO
Ukraine · [відкрити контакти](див. вище в блоці «контактна інформація») · tg: @andrqxa_p · [відкрити контакти](див. вище в блоці «контактна інформація»)
[відкрити контакти](див. вище в блоці «контактна інформація») · https://github.com/andrqxa
SUMMARY OF QUALIFICATIONS
Backend Engineer with 10+ years of experience building enterprise software, backend systems,
automation tooling, and data-processing platforms.
Commercial experience with Go and Java across cloud-native environments, distributed systems, CI/CD
automation, and backend services.
Worked with REST and gRPC APIs, Oracle, PostgreSQL, AWS, GCP, Docker, and Kubernetes-based
environments.
Experienced in backend development, migration tooling, infrastructure automation, and operational
support. Strong analytical skills and pragmatic engineering approach.
PROFESSIONAL SKILLS
• Languages: Go (Golang), Java, SQL, Bash, Python.
• Backend: REST, gRPC, Microservices.
• Go ecosystem: Goroutines, Context, Synchronization, Generics, sqlx, Testing.
• Cloud & Infra: Docker, Kubernetes, AWS, GCP.
• Databases: Oracle, Google Spanner, PostgreSQL, Redis, MySQL, MariaDB, MongoDB, DB2.
• DevOps: GitHub Actions, GitLab CI/CD, Jenkins.
• Messaging: Google Pub/Sub, Apache Kafka.
• Observability: Prometheus, Grafana, SigNoz – dashboards and querying.
• AI-assisted Development: Claude Code, Codex.
• Other: Distributed Systems, Data Migration, Validation Tooling.
PROFESSIONAL EXPERIENCE
Backend Engineer (Go) May 2026 – present
Mabrook Livestream
Project: Social video platform — live streaming, in-app economy, moderation, discovery.
Responsibilities:
• Go monorepo (~40 binaries: HTTP API, consumers, workers, reconcilers, cron jobs), hexagonal
modules, PostgreSQL, Redis, Google Pub/Sub, GKE.
• Work on the money path: wallet and double-entry ledger, idempotency keys, escrow settlement,
and the reconcilers that prove balances.
• Delivered the news module: feed fetchers, proxy rotation with failure classification, geo-targeting,
and the database migrations behind them.
• Integration tests behind build tags, swagger annotations kept in sync with handlers, custom
golangci-lint plugins guarding money-path invariants.
• CI/CD on GitHub Actions with three-tier promotion develop → staging → production.
• Authored internal AI-agent skills and repository automation (Claude Code, Codex CLI) used by
the team for review, testing and evidence workflows.
Impact:
Shipped the news module end-to-end and hardened the money path with lint-enforced invariants and
integration coverage.
Backend Engineer (Go) January 2026 – April 2026
Empat
Project: Cloud-native platform for bulk email and messaging campaigns.
Responsibilities:
• Built backend components using Go.
• Worked with gRPC services and GCP infrastructure.
• Used Google Spanner, Pub/Sub, BigTable and BigQuery.
• Participated in development of cloud-native backend functionality.

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Professional Development · Independent August 2025 – December 2025
• Self-directed Go work between engagements: concurrency, service design, observability.
• Built and published projects: a concurrent weather aggregation service (Go, Fiber, multi-
provider, scheduling, graceful shutdown); a GetStream Chat + PocketBase demo backend (Go);
a gRPC-based microservice platform (Go, Docker); a Redis distributed-lock ticketing service
(Java 21, Spring Boot 3).
• Completed “Practical Introduction to Observability”.
Backend Engineer (Java | Serverless Integrations) March 2025 – July 2025
Intellias
Project: Cloud-native platform for synchronizing tasks, comments, and workflow events between
corporate systems.
Responsibilities:
• Built backend components using Java 21, Micronaut, AWS Lambda, SQS, S3 for a fully serverless
integration pipeline.
• Implemented event workflows ensuring consistency and idempotency across services.
• Developed HTML → ADF transformation logic and content-processing modules.
• Improved observability with structured logging and performance metrics.
• Automated CI/CD via GitLab CI, AWS CLI, IaC.
• Refined integration contracts with engineering, QA, and product teams.
Impact:
Delivered a serverless pipeline replacing a legacy tool, cutting monthly operational costs by ~40% and
improving processing latency by ~25%.
Backend Engineer (Java | Go | DevOps) June 2024 – March 2025
Intellias
Project: Internal developer tooling and automation for Kubernetes-based environments.
Responsibilities:
• Maintained deployment automation tools and CI/CD pipelines (Jenkins, GitLab CI).
• Developed and refactored Java backend components to improve system reliability.
• Integrated Go modules into existing toolchains; reviewed Go CLI tooling.
• Worked with Kubernetes deployment workflows, Docker-based tooling and automation scripts.
• Enhanced observability with better logging, tracing, and metrics.
Impact:
Reduced operational friction and increased reliability of developer tooling across multiple engineering
teams.
Database Migration Consultant (Go | Oracle | PL/SQL | Bash) February 2021 – January 2022
TietoEvry
Project:
Migration of a legacy DB2-based banking system to Oracle 12c.
Responsibilities:
• Implemented key parts of a DB2-to-Oracle migration toolchain using Go, Bash and PL/SQL.
• Rewrote slow Bash tooling into Go, improving speed and reliability.
• Automated export, transformation, validation, import flows for structured banking data.
• Developed PL/SQL scripts for schema migration and integrity checks.
• Ensured schema compatibility and correctness through automated validation.
Impact:
Delivered a stable migration platform with greatly reduced execution time and minimal manual effort.

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Backend Engineer (Java | Go | Data Tooling) June 2018 – May 2024
Intellias
Project:
Geodata processing platform for mapping, routing, and automotive navigation (datasets 60GB+ per
region).
Responsibilities:
• Developed Java + Vaadin backend components for data workflows and validation features.
• Integrated Kafka to streamline event propagation and data-processing triggers.
• Built Go tools replacing Python scripts for detecting schema mismatches and corrupt data.
• Implemented Go utilities for exporting, validating, and transforming datasets into SQLite.
• Participated in modernization initiative (Java → Go, Vaadin → Vue.js).
• Synced data structures with C++ binary-generation components.
• Worked with Oracle databases behind the processing workflows: queries, schema changes and data
integrity checks.
• Maintained CI/CD pipelines (Jenkins) for build, validation and release workflows.
Impact
Significantly reduced manual QA work and improved data consistency via Go-based validation and
modernization tools.
Java Developer November 2017 – May 2018
EPAM Systems, Inc.
Project: A backend modernization project for a large financial institution.
Responsibilities:
• Developed backend components for transaction processing and internal service logic.
• Refactored modules to reduce technical debt and align with updated workflows.
• Implemented validation and error-handling rules for financial operations.
• Participated in performance tuning and load testing.
Impact:
Improved reliability and performance of critical banking modules.
Java Developer | Reporting Engineer July 2015 – October 2017
MERA Software Services, Inc.
Project: A reporting and analytics platform for a telecommunications provider.
Responsibilities:
• Developed reporting modules using Java and JasperReports.
• Implemented SQL-based data extraction and validation processes.
• Migrated datasets from MySQL to MariaDB.
• Optimized long-running reports through query tuning and indexing.
• Automated parts of report-generation workflows.
Impact: Reduced report-generation time and improved overall stability of telecom reporting pipelines.
EDUCATION
Specialist Degree (equivalent to master’s) 2004
Department of automation and control systems, “Sevastopol National Technical University” (former),
Ukraine