Experience — Denis Sirashev

Mar 2025 — Jun 2026

Fullstack Developer

Linked Helper · Remote

Shipped multi-account support across React architecture, contexts, API requests and exports in an Electron app.
Migrated account administration, access controls, billing and promo forms to workspaces, including NestJS backend logic.
Delivered AI generation configuration, service integration and token billing for production replies and outbound messages.
Introduced Storybook, migrated to React 18 and added Jest coverage for backend features and fixes.

Nov 2022 — Feb 2025

Yandex Market · Moscow

Unified 19 authentication entry points; the mechanism was also adopted by Market B2B.
Added a popup authentication action. Internal 11.11 campaign analytics showed an approximately 10% relative increase in authentication conversion.
Extended onboarding across Market, Market B2B and Yandex Go; an emulator helped marketing scale from 2–4 to about 20 concurrent popups.
Brought CLS and FCP within target thresholds, verified through Lighthouse and internal monitoring.
Investigated on-call alerts with ClickHouse logs and independently conducted 30+ coding interviews.

Apr 2020 — Jun 2022

Playtomic · Spain · remote

Built and launched a sports-club TV interface for match statistics, player standings and schedules.
Developed admin payment interfaces and pricing rules by date, area, sport and player count.
Migrated payments, schedules and court management to a feature-based architecture.
Prototyped a Cypress API record/replay plugin to address backend timeout failures; validated stability on two tests.

Jun 2015 — Mar 2020

Client contracts via Upwork · International clients · remote

Knkt Interactive, Australia: independently built and launched a nationwide vaccination-booking platform covering clinics, slots, nurses, invitations and patient booking. Served an estimated 100,000+ patients.
Exit Intelligence, US: built a React campaign analytics portal and Laravel API, with Aurora aggregate storage refreshed every 15–30 minutes.
Exit Intelligence: built a production Laravel email service with shared provider interfaces; integrated Mailchimp, SendGrid and campaign actions.
ScoreMore Mobile, US: built a React Native app, database and AWS AppSync schema for surveys, prize draws, events and quizzes. Left before the production launch.

2014 — Jun 2015

Danila-master · Russia

Maintained an OpenCart store; built a Yii manager portal and AngularJS 1.x product configurator with visual editing, compatibility rules and calculated pricing.
Created the configurator’s database tables, dependencies and relationships, plus internal configuration forms for administrators and managers.
Led three direct reports, handling hiring, task allocation, code review and technical decisions.
Responded to a DDoS incident by placing the site behind a gateway and removing origin-IP exposure.

Ufa State Aviation Technical University
Industrial Electronics · Engineer qualification · 2010

English — B2 · Russian — native