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OLEKSII ILIUSHYN
Full Stack Engineer | Mobile | Web | Backend
[open contact info](look above in the "contact info" section) [open contact info](look above in the "contact info" section) LinkedIn Kyiv, Ukraine

SUMMARY SKILLS
Full stack engineer with eight years of experience delivering web, Frontend
mobile and backend products. I build user-facing features, design APIs
React, Next.js, React Router, Vite,
and data flows, and improve performance, reliability and release quality.
My work spans banking, aquaculture and health products, with a focus
Webpack, Gulp, Tailwind CSS, Material UI,
on practical solutions that serve both users and operations teams Chakra UI, styled-components, SCSS,
Storybook, design systems, virtualized
lists, web performance optimization
EXPERIENCE
State & data layer
Senior Full Stack Engineer Redux, Redux Toolkit, RTK Query, Zustand,
Artkai MobX, Context API, TanStack React Query,
10/2024 - 09/2026 Apollo Client, React Hook Form, Formik,
• Developed a fintech banking application, developing key user flows Zod
such as money transfers, payment templates, and other core
financial features Mobile
• Built services for a banking content management panel: REST
endpoints, Prisma migrations, JWT sign-in, role permissions and React Native CLI, Expo, React Navigation,
Swagger documentation Reanimated, MMKV, SQLite, offline-first
• Simplified state, navigation and form handling for multistep sync, background geolocation, push
transactions, while improving consistency and accessibility on web, notifications (FCM / APNs), biometrics,
iOS and Android Keychain / Keystore, universal linking, deep
linking, OTA updates, Fastlane, EAS Build,
Senior Full Stack Engineer Android Studio, Xcode, App Store and Play
Store releases
Aqua Farm
07/2022 - 09/2024
Backend
• Designed and built an aquaculture management system from initial
requirements through a cross-platform mobile release Node.js, Nest.js, Express.js, Python
• Added live monitoring and visualizations that improved fish-growth (FastAPI), REST, WebSockets, GraphQL,
tracking accuracy by 10% microservices, background workers,
• Improved mobile data processing and interface responsiveness for schedulers, webhook ingestion, event-
field teams; presented progress and product capabilities to investors driven architecture
and leadership

AI
Full Stack Engineer
Claude, Codex, Gemini, RAG pipelines,
Baby Journey OpenAI and Anthropic APIs, vision models,
09/2020 - 07/2022 prompt engineering, structured output
• Integrated external health analytics and personalized notifications validation, confidence thresholds, Spec-
for expectant mothers, contributing to a 6% increase in daily active driven development, human-in-the-loop
users review
• Coordinated priorities and work across teams to release features at
key pregnancy milestones
• Introduced unit and end-to-end coverage for health tracking and Databases & storage
community features to improve release stability PostgreSQL, MongoDB, Redis, Prisma,
TypeORM, Mongoose, S3, schema design,
Middle Frontend Engineer migrations, indexing and query
Colive optimization
12/2018 - 09/2020
• Worked with marketing and analytics teams on tracking features that Cloud
improved product metrics by 8% Google Cloud, Firebase (Auth, FCM,
• Enhanced application performance by 15% by resolving production Crashlytics, Analytics), AWS (S3, Lambda,
issues and maintaining code quality standards RDS, SQS / SNS, CloudWatch, CloudFront),
• Refactored existing applications and expanded test coverage to
Azure
reduce crashes
• Migrated the codebase from JavaScript to TypeScript while
continuing to ship features, prioritizing payment logic and the API
layer to prevent refactors from silently mixing up amount fields

LANGUAGES SKILLS
Ukrainian Native English B2 Testing
Jest, React Testing Library, Detox,
Supertest, Cypress, Playwright, MSW,
Appium, Maestro, Vitest

DevOps & CI/CD
Docker, Docker Compose, GitLab CI/CD,
GitHub Actions, Bitbucket Pipelines,
Bitbucket, Jenkins, Nginx, Kubernetes, Nx,
Turborepo, automated and staged
deployments, multienvironment
configuration, secrets management

Monitoring & observability
Firebase Crashlytics, Sentry, CloudWatch,
Datadog, CloudWatch, product analytics

Security
KYC / identity verification, OAuth2, JWT,
biometric auth, HMAC request signing,
encrypted transport and storage, secure
credential storage

Engineering practices
Agile / Scrum, Git / GitFlow, Jira, System
design, documentation, architecture
reviews, solution documentation, code
review, Mentoring.