Open to senior rolesSenior Frontend / Platform Engineer

Frontend architecture forproducts that can't affordto feel fragile.

Hands-on technical lead and senior frontend / platform engineer. 7+ years across React, TypeScript, fintech and crypto — from React migrations and design systems to CI/CD, monitoring and release operations.

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Based in

Prague, Czechia

ReactTypeScriptFintechCryptoProduction ownership

// operator

Alexander Priadchenko

50.0755° N, 14.4378° E

Available

Focus

Frontend · Platform

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

01What I bring

Not just screens. Product surfaces with ownership

My work sits between interface, architecture and production reality — from React migrations and shared UI systems to CI/CD, monitoring and release workflows.

01 / 04

Frontend platform engineering

React 15 → React 19 migrations, pnpm / Turborepo monorepos, shared UI packages, state management and design systems built to stay maintainable as the product grows.

MonorepoDesign systemsStateMigrations

02 / 04

Fintech & crypto product UX

Exchange, wallet, payments, affiliate and ops interfaces — surfaces where a small UX mistake quietly becomes real money risk.

ExchangeWalletPaymentsTrading flows

03 / 04

Production ownership

CI/CD, Docker, Traefik, Nginx, monitoring and release workflows. The layer around the interface is part of the interface.

CI/CDDockerTraefikMonitoring

04 / 04

Technical leadership

Hands-on architecture, code review, task breakdown and mentoring — raising engineering quality without disappearing into meetings.

ArchitectureCode reviewMentoringDelivery

02Trajectory

Where I've shipped

Seven-plus years across fintech, crypto, SaaS and engineering education — most often as the person who owned the frontend when no one else did.

TAF projects

Frontend Team Lead / Senior Frontend Engineer

Mar 2026 — PresentDubai / Remote

Leading a 3-person team hands-on — architecture, code review, task breakdown and infrastructure decisions.
Architected a React 19 / Vite 8 pnpm monorepo: mobile-first SPA, back-office admin and a shared @taf/ui library published to a private GitLab npm registry.

React 19Vite 8pnpmMonorepoTeam leadPrivate npm

Simplecoin

Flagship

Technical Lead / Senior Frontend Platform Engineer

Nov 2024 — May 2026Prague

Sole frontend engineer on a live crypto / fintech product — exchange, wallet, payments, affiliate and ops UIs. Owned architecture, API contracts, state, build and deployment.
Migrated the live exchange from React 15 → React 19 and restructured it into a pnpm / Turborepo platform with shared UI and app-kit packages.

React 19TypeScriptTurborepoWeb3Trading UXArchitecture

Simplecoin

Platform & Release Infrastructure Engineer

Jun 2025 — May 2026Prague

Owned Docker / Traefik multi-host deployment, release scripts, cache tooling, wallet-daemon infrastructure and frontend hosting across exchange, landing, wallet and WordPress surfaces — over SSH / Tailscale / Teleport.

DockerTraefikNginxRelease engTailscaleTeleport

Simplecoin

Android Application Engineer

Sep 2025 — Jan 2026Prague

Kotlin / Jetpack Compose: secure signing with Android Keystore + ECDSA, biometric UX, Room / DataStore persistence, an OkHttp network layer and WorkManager approval flows.

KotlinJetpack ComposeKeystoreECDSABiometricsWorkManager

Odin Pay

Infrastructure Team Lead / Acting CTO

Jun 2025 — Dec 2025Kyiv / Remote

Led infrastructure strategy for a fintech payment platform — Linux / PostgreSQL / Nginx / systemd, Keycloak + Camunda IAM, SIEM / Wazuh, backup & DR runbooks and production governance.

Acting CTOLinuxPostgreSQLKeycloakSIEM / WazuhDR

03Selected work

Three systems I rebuilt under pressure

Short stories from production — where frontend, platform and security overlapped and someone had to own the whole path.

Legacy → Platform

Migrating a live crypto exchange from React 15 to React 19

A decade-old exchange, still trading, rebuilt underneath the users.

React 19TypeScriptTurborepopnpmWeb3Design system

As the sole frontend engineer on a live crypto/fintech product, I took an exchange running on React 15 and moved it to React 19 — then restructured the whole thing into a pnpm / Turborepo platform with shared UI and app-kit packages. The work spanned exchange, wallet, payments, affiliate and ops surfaces, with the API contracts, state and build owned end to end.

What it took

01Incremental React 15 → 19 migration on a system that could not go dark
02pnpm / Turborepo restructure with shared UI + app-kit packages
03Owned architecture, API contracts, state management, build and deployment

Beyond the browser

Owning release infrastructure, not just the interface

The frontend doesn't end at the bundle — it ends in production.

DockerTraefikNginxTailscaleTeleportKeycloak

Alongside the product work I owned the release layer: Docker / Traefik multi-host deployments, release scripts, cache tooling, wallet-daemon infrastructure and frontend hosting across exchange, landing, wallet and WordPress surfaces — operated over SSH, Tailscale and Teleport. In a parallel fintech engagement I led infrastructure strategy as acting CTO: Linux, PostgreSQL, Nginx, Keycloak + Camunda IAM, SIEM / Wazuh and DR runbooks.

What it took

01Docker / Traefik multi-host deployment and release scripting
02Frontend hosting + cache tooling across four production surfaces
03Secure operations over SSH / Tailscale / Teleport

Secure mobile signing

A native approval app for transaction signing

When a tap authorises money, the security model has to be exact.

KotlinJetpack ComposeKeystoreECDSAWorkManagerBiometrics

Built a Kotlin / Jetpack Compose application for secure transaction signing: keys generated and held in the Android Keystore, ECDSA signatures, biometric-gated UX, Room / DataStore persistence, an OkHttp network layer and WorkManager-driven approval flows. The interface is small — the threat model behind it isn't.

What it took

01Hardware-backed key storage in the Android Keystore + ECDSA signing
02Biometric-gated approval UX with Room / DataStore persistence
03WorkManager approval flows over an OkHttp network layer

04Systems map

A stack connected into working production

Not a tool collection — these are grouped the way I actually use them: from interface down to infrastructure, security and mobile.

104

Technologies

Clusters

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

05Engineering temperament

Calm execution in complex systems

I work best where systems are complex, ownership is unclear and the product needs someone who can bring structure. I prefer direct communication, practical decisions and clear responsibility over process for its own sake.

I'm comfortable moving between product UX, frontend architecture, API contracts, deployment workflows and incident-level thinking — and I'd rather connect tools into a working production system than collect them. The aesthetic is the same as the work: minimal, dark, precise, structured.

“I'm most useful when the system is already moving, already complex, and needs someone to bring structure without slowing delivery.”

P-01

Structure over chaos

I'm most useful where the system is already moving, already complex, and needs someone to bring order without slowing delivery.

P-02

Own the full path

From component to API contract to deployment and incident. I care about the whole path from code to user, not just the screen.

P-03

Ship, then stabilise

Build interfaces that survive real users, real releases and real incidents — then keep hardening them in place.

P-04

Durable over clever

I prefer systems that are understandable, maintainable and built for real use over decorative complexity.

P-05

Direct communication

Practical decisions, clear ownership, honest status. Calm execution in complex systems beats noise.

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 build something that holds

Available for senior frontend, platform and technical-lead roles. Tell me about the system — the messier the better.

Available for senior frontend / platform / technical lead roles

Prefer to skip the form? Reach me directly — I read everything and reply personally.