Open to senior rolesSenior Frontend / Platform Engineer

Frontend architecture forproducts that needto stay reliable.

Hands-on technical lead and senior frontend / platform engineer with 7+ years of experience in React, TypeScript, fintech and crypto. I work across frontend architecture, design systems, CI/CD, monitoring and production delivery.

Contact me

View experience Download résumé

Based in

Prague, Czechia

ReactTypeScriptFintechCryptoProduction ownership

// operator

Alexander Priadchenko

50.0755° N, 14.4378° E

Available

React 19◇TypeScript◇Turborepo / pnpm◇Design systems◇wagmi · viem◇Docker · Traefik◇CI/CD◇Keycloak · SIEM◇Kotlin · Compose◇Node · NestJS◇Monitoring◇Release ops◇

01What I do

Frontend work with real ownership

I work across interface, architecture and production delivery - from React migrations and shared UI systems to CI/CD, monitoring and release workflows.

01 / 04

Frontend platform engineering

React migrations, pnpm and Turborepo monorepos, shared UI packages, state management and design systems built for long-term maintenance.

MonorepoDesign systemsStateMigrations

02 / 04

Fintech and crypto products

Exchange, wallet, payment, affiliate and operations interfaces where clarity, consistency and reliability directly affect users and money.

ExchangeWalletPaymentsTrading flows

03 / 04

Production ownership

CI/CD, Docker, Traefik, Nginx, monitoring and release workflows. I treat delivery and infrastructure as part of the product, not as someone else's problem.

CI/CDDockerTraefikMonitoring

04 / 04

Technical leadership

Hands-on architecture, code review, task breakdown and mentoring, with a focus on improving quality without slowing the team down.

ArchitectureCode reviewMentoringDelivery

02Experience

What I've built

More than seven years across fintech, crypto, SaaS and engineering education, often in roles where I owned the frontend and the systems around it.

TAF projects

Frontend Team Lead / Senior Frontend Engineer

Mar 2026 — PresentDubai / Remote

Led a three-person team while staying hands-on with architecture, code review, task breakdown and infrastructure decisions.
Designed a React 19 and Vite 8 pnpm monorepo with a mobile-first SPA, back-office admin and a shared @taf/ui library published through a private GitLab npm registry.

React 19Vite 8pnpmMonorepoTeam leadPrivate npm

Simplecoin

Flagship

Technical Lead / Senior Frontend Platform Engineer

Nov 2024 — May 2026Prague

Worked as the sole frontend engineer on a live crypto and fintech product covering exchange, wallet, payments, affiliate and operations interfaces. Owned architecture, API contracts, state, build and deployment.
Migrated the live exchange from React 15 to React 19 and restructured it into a pnpm and Turborepo platform with shared UI and app-kit packages.

React 19TypeScriptTurborepoWeb3Trading UXArchitecture

Simplecoin

Platform & Release Infrastructure Engineer

Jun 2025 — May 2026Prague

Managed Docker and Traefik multi-host deployments, release scripts, cache tooling, wallet-daemon infrastructure and frontend hosting across exchange, landing, wallet and WordPress products using SSH, Tailscale and Teleport.

DockerTraefikNginxRelease engTailscaleTeleport

Simplecoin

Android Application Engineer

Sep 2025 — Jan 2026Prague

Built a Kotlin and Jetpack Compose application with Android Keystore and ECDSA signing, biometric approval flows, Room and DataStore persistence, OkHttp networking and WorkManager-based background processing.

KotlinJetpack ComposeKeystoreECDSABiometricsWorkManager

Odin Pay

Infrastructure Team Lead / Acting CTO

Jun 2025 — Dec 2025Kyiv / Remote

Led infrastructure work for a fintech payment platform, including Linux, PostgreSQL, Nginx, systemd, Keycloak, Camunda IAM, SIEM, Wazuh, backup and disaster recovery processes and production governance.

Acting CTOLinuxPostgreSQLKeycloakSIEM / WazuhDR

03Selected work

Three projects with real responsibility

Examples of work where frontend, infrastructure and security were connected and needed one clear owner.

Legacy to platform

Migrating a live crypto exchange from React 15 to React 19

A live exchange rebuilt without taking the product offline.

React 19TypeScriptTurborepopnpmWeb3Design system

As the sole frontend engineer on a live crypto and fintech product, I migrated the exchange from React 15 to React 19 and restructured it into a pnpm and Turborepo platform with shared UI and app-kit packages. The work covered exchange, wallet, payments, affiliate and operations interfaces, including API contracts, state management, build and deployment.

What was involved

01Incremental React 15 to React 19 migration without taking the system offline
02pnpm and Turborepo restructuring with shared UI and app-kit packages
03Ownership of architecture, API contracts, state management, build and deployment

Beyond the browser

Owning the release layer as well as the frontend

Frontend work does not stop when the bundle is built.

DockerTraefikNginxTailscaleTeleportKeycloak

Alongside product development, I managed the release layer: Docker and Traefik multi-host deployments, release scripts, cache tooling, wallet-daemon infrastructure and frontend hosting across exchange, landing, wallet and WordPress products. I also led infrastructure strategy in a separate fintech project, covering Linux, PostgreSQL, Nginx, Keycloak, Camunda IAM, SIEM, Wazuh and disaster recovery processes.

What was involved

01Docker and Traefik multi-host deployments and release automation
02Frontend hosting and cache tooling across four production products
03Secure operations through SSH, Tailscale and Teleport

Secure mobile signing

A native approval app for transaction signing

A small interface backed by a strict security model.

KotlinJetpack ComposeKeystoreECDSAWorkManagerBiometrics

Built a Kotlin and Jetpack Compose application for secure transaction signing. Keys are generated and stored in the Android Keystore, signatures use ECDSA, approvals are protected by biometrics, data is stored with Room and DataStore, networking runs through OkHttp and background approval flows are handled with WorkManager.

What was involved

01Hardware-backed key storage in the Android Keystore with ECDSA signing
02Biometric approval flows with Room and DataStore persistence
03WorkManager-based approval processing over an OkHttp network layer

04Skills

A stack built for production

These tools are grouped by how I use them in real systems - from frontend and APIs to infrastructure, security, testing and mobile.

104

Technologies

Areas

React / TypeScript

SYS·01

React 19TypeScriptJavaScriptNext.jsViteReact CompilerPreactVue

State & Data

SYS·02

Redux ToolkitZustandTanStack QuerySWRRedux Saga

Build & Monorepo

SYS·03

Turborepopnpm WorkspacesWebpackBabelViteMonorepo architecturePrivate npm

UI & Design Systems

SYS·04

shadcn/uiTailwind CSSMantineRadix UIMaterial UIFramer MotionSASS / SCSSCSS ModulesStyled ComponentsEmotion

Forms & Validation

SYS·05

React Hook FormZodFormikYup

Web3 / Crypto

SYS·06

wagmiviemSIWERainbowKitEthereumPolygonSolidityFoundry

Backend / API

SYS·07

Node.jsExpress.jsNestJSFastifyHonoREST APIOpenAPIWebSocketSocket.io

Databases

SYS·08

PostgreSQLMongoDBRedisSurrealDBFirebaseBullMQ

Infrastructure / DevOps

SYS·09

DockerTraefikNginxLinuxCI/CDGitHub ActionsGitLab CIAWSAWS EC2CoolifyProxmoxTeleportWarpgate

Security / IAM / Observability

SYS·10

KeycloakSIEMWazuhOpenTelemetrySentrySigNozGraylogOAuth 2.0JWTTOTP

Testing / QA

SYS·11

VitestTesting LibraryCypressStorybookPostman

Payments & SaaS

SYS·12

StripeBillingRBACOnboardingDunning

Android / Mobile

SYS·13

KotlinJetpack ComposeAndroid KeystoreECDSARoomWorkManager

i18n / Analytics

SYS·14

i18nreact-i18nextnext-i18nextGoogle Tag Manager

Design Tools

SYS·15

FigmaPhotoshopSplineWebflow

05How I work

Clear decisions in complex systems

I work best in products where the system is already complex, ownership is unclear and the team needs someone to bring structure. I prefer direct communication, practical decisions and clear responsibility over unnecessary process.

I am comfortable moving between product UX, frontend architecture, API contracts, deployment workflows and incident response. I care more about connecting the whole system than collecting isolated tools.

“I am most useful when the product is already moving, the system is complex and the team needs structure without losing delivery speed.”

P-01

Bring structure

I am most useful when a system is already complex and needs clearer boundaries, ownership and direction without slowing delivery.

P-02

Own the full path

I look at the full path from component and API contract to deployment, monitoring and the final user experience.

P-03

Deliver and improve

I prefer shipping useful work, measuring how it behaves in production and improving it continuously.

P-04

Keep systems understandable

I value maintainable systems with clear logic over complexity that only looks impressive.

P-05

Communicate directly

Clear decisions, honest status and visible ownership usually solve more problems than extra process.

Education

Donbass State Engineering Academy
Master's degree
Sept 2022 — Dec 2023
Donbass State Engineering Academy
Bachelor's degree
Sept 2018 — Jun 2022

Languages

RussianNative / Bilingual
UkrainianNative / Bilingual
EnglishProfessional working
CzechLimited working

Certifications

Full Stack Developer
GoIT, Kyiv
Certificate ID: FS_8075 · Feb 2022
Front-End Developer
Computer Academy STEP, Kramatorsk
Diploma KMY-007394 · Sept 2021
CINEMA 4D
Computer Academy STEP

06Contact

Let's talk about the product

Open to senior frontend, platform and technical lead roles. Tell me what you are building, what is not working and where you need ownership.

Available for senior frontend, platform and technical lead roles

Prefer email? Contact me directly and I will reply personally.