Nikita K.

Full Stack Developer

Sequoia • Período integral

Jan 2026 - Present • 9 mos

Building B2B products for affiliate marketing end to end, from database to UI: a competitor ad analytics service (search and YouTube ads) and a network of content sites. - Took the ad analytics service from MVP to production in 1 month: NestJS search API with composite PostgreSQL indexes and a React client; p95 response 280 ms - Built a creative search UI that handles 5,000+ records without lag: virtualized table, filters synced to the URL, video ad and landing page previews - Grew collected ads 3.4x: SERP API and YouTube Data API adapters with shared normalization, Redis response cache; scraper success rate from 72% to 94% (Python, Playwright) - Automated site restoration from web archives: launch time per site cut from 2-3 days to 4-5 hours (parsing, SEO checks, Nginx configs, Docker deploy) - Brought the sites to green Core Web Vitals on mobile: LCP from 4.6 s to 1.9 s

Full Stack Developer

Точка • Período integral

Jul 2024 - Dec 2025 • 1 yr 5 mos

Internal services for the security team of a digital bank, used daily by about 60 people: client and candidate checks, merchant acquiring, blocklists, security controls. - Cut the candidate scoring API response time from 5 s to 1.5 s by rewriting heavy queries with joins, window functions and PostgreSQL materialized views - Built and launched a candidate questionnaire service from scratch in 2 sprints: data model and REST API on NestJS, React UI from Figma designs, Docker and GitLab CI/CD - Made candidate checks resilient: failures caused by unavailable external sources dropped from 11% to 0.8% after moving synchronous calls to RabbitMQ queues with retries and a dead-letter queue - Moved the frontend to Feature-Sliced Design with Redux Toolkit and RTK Query, cutting API requests on key screens by 38% - Introduced code quality standards: ESLint and Prettier with pre-commit hooks, required unit tests (Jest) and Playwright e2e tests for critical flows; coverage grew from 24% to 63%, production bugs fell by 27%

Full Stack Developer

A2SEVEN • Período integral

Jun 2023 - Jul 2024 • 1 yr 1 mo

HR automation platform for client companies with 1,000+ employees in the system: recruiting, leave management, electronic document flow. - Decoupled leave management releases from the rest of the platform by moving leave approval into a separate NestJS microservice with its own MySQL database; other services connect through a REST API documented in Swagger - Cut build time from 11 to 4 minutes and gave the recruiting, leave and document modules independent deploys by splitting the frontend into microfrontends (Vite Module Federation) - HR managers now react to new requests in 20 minutes instead of 1.5 hours: status notifications moved to WebSocket, updates arrive without a page reload - Cut developer onboarding to one week: wrote architecture and local setup docs, onboarded 2 new developers, introduced cross code review