Олег

Languages:
English (Reading, writing, speaking): Upper intermediate.
Ukrainian, Russian: Native.

Professional Skills

Testing Tools
- Test management: Qase · TestRail · Xray · Azure DevOps
- API testing: Postman · GraphQL · Swagger · gRPC (grpcurl,
proto-schema validation)
- Proxy: Charles Proxy · mitmproxy
- Mobile SDK: Android Studio · Xcode
Cherevko Oleg Databases & Search
MongoDB · MySQL · SQLite · CouchDB · Elasticsearch · Redis
I am a QA Engineer with full system
development life cycle experience, (cache behavior & invalidation)
including designing, developing, and Monitoring & CI/CD
implementing test plans, cases, and
processes. Kibana · Elastic (jet-logs · api-trace · mobile-logs) · TeamCity ·
Hands-on technology professional GitLab CI
accustomed to working in complex,
project-based environments. I am hard- Bug & Project Tracking
working and self-motivated with lots of
initiative and enthusiasm for delivering Jira · Confluence · Azure DevOps
high-quality software. Web Technologies
HTML · CSS · JSON · XML · JavaScript (basic) · Protobuf
Design & Collaboration
Figma · Axure · Invision · Miro
Contact info Methodologies
Agile (Scrum, Kanban) · Waterfall
AI Tools
Telegram: https://t.me/Ecclesiastes_Che Claude Code · AI-assisted test analysis · Semantic codebase
Phone number: [відкрити контакти](див. вище в блоці «контактна інформація») search (Qdrant)

Linkedin:
[відкрити контакти](див. вище в блоці «контактна інформація»)
cherevko-168a67156/
Actual experience

7+ years Web / 3+ years Mobile QA (Flutter iOS & Android)
Education Test artifacts: Test Plan, Test Strategy, Test Design, Analytics
Requirements analysis & BA participation in commercial projects
Manual testing + automation scripts (run & analyze)
DNIPRO STATE AGRARIAN AND Root cause analysis & technical problem investigation
ECONOMIC UNIVERSITY, Ukraine
Bachelor’s degree in accounting and Distributed system testing: microservices chains, race conditions,
auditing. cache consistency
API testing: REST + gRPC contracts, error mapping, idempotency &
webhook validation
Log-based debugging: distributed tracing across service chains
(Elastic api-trace)
Flutter architecture understanding: stores, screens, widgets, feature
modules
Fintech domain: crypto wallets, card products, payments, KYC/AML
flows
Mentoring junior QA engineers
Product & Outsource company experience
 Work experience

Simple Wallet · April 2025 — present
Mobile QA (Flutter)
Testing Flutter applications on iOS and Android
Understanding of Flutter architecture: stores, widgets, screens, features
Knowledge of Android fragmentation specifics and iOS restrictions
API / Backend
gRPC testing (contracts, proto schemas, error codes)
REST API testing (Postman, curl, contract testing)
Understanding of microservices architecture: WalletApi → Service → Repository call chains
Redis/cache — understanding of race conditions between API reads and webhook writes
Domain and Business Logic
Custodial / Non-custodial wallets (CW / NCW)
Card products (Wirex, Unlimint)
Transactions, balances, webhooks from payment providers
Compliance, KYC/AML basics
Cryptocurrencies: transfers, earn, staking
Soft Skills / Process
Working in Agile/Scrum: participation in sprint planning and retrospectives
Clear bug reporting with steps, logs, and traces
Communication with backend/frontend developers using technical language

Ria.com · May 2024 — November 2024
Project: Dim Ria
Domain: Real Estate

Additional: AI testing

Creologiq · June 2022 — December 2023
Project: Cashier (Admin panel / Payments integration)
Domain: Payment system

Additional: - Mentoring

Yalantis · June 2021 — April 2022
Projects: “Oxygen”, “Astraus Health”
Domains: Pharmacy / Healthcare · Banking

Additional: - Mentoring

First companies

Agilie · Sep 2019 – May 2021
Functional & regression testing, bug & test reports, exploratory testing,
mobile testing.
Projects: “FFWD”, “Gleec wallet”, “Gobi, Pharmacy”, “Level1”, “Apteka 911”
Domains: Crypto · Trading · Pharmacy/Healthcare · Marketplace

Wizards Dev · Jan 2018 – Sep 2019
Functional & regression testing, bug & test reports, automated scripts, mentoring
*Projects: “Super Binary”, “Maximarkets”
*Domains: Trading · Binary option