STATUS: CAFFEINATED & AVAILABLE

Mariia Paik

$_
3+YEARS EXPERIENCE
70GBANALYTICS DATA HANDLED
10+AD-NETWORK INTEGRATIONS
Client-focused development

What I Build

agent.run()

$launch --offer "summer-sale"

✓ generated 6 creatives

✓ published to 3 sources

▶ optimizing budget_

AI Automation & Agents

Software that does your repetitive work on its own.

  • OpenAI / Claude integrations
  • RAG and knowledge search
  • n8n and backend automation
analytics
ROI+38%
LOAD0.4s

Dashboards & Internal Tools

Apps that turn messy data into clear decisions.

  • Analytics dashboards
  • CRM and management tools
  • Role-based product flows
checkout
Pay €49 →

Client Websites & Payments

Sites that turn visitors into paying customers.

  • Landing pages and service sites
  • Signup / booking flows
  • Stripe, PayPal and Google integrations
Websites, funnels and integrations

Client Work

Selected projects shipped end-to-end for independent clients, from first structure and UI to backend logic, forms and integrations.

stefit.sk
Fitness Coach Website preview

Fitness Coach Website

High-converting site for a personal fitness brand.

ReactNode.jsUI/UXResponsiveSEO
thesdds.com
Dance Course Landing preview

Dance Course Landing

Landing + signup funnel for a dance course.

ReactAPI IntegrationWeb Design
private project
Podiatry / Beauty Website preview

Podiatry / Beauty Website

Service site that builds trust and books clients.

ReactUI/UXAPI IntegrationSEO
private project
Course Signup Page preview

Course Signup Page

Fast signup page built to convert.

ReactAPI IntegrationLead Gen
private project

Sales & Content Platform

WIP

Gated content + Stripe payments platform.

ReactNode.jsStripeFirebaseGAE
Production SaaS case study

TrackBoost: AI Ads Platform

CASE STUDY

TrackBoost

AI-powered ads-optimization platform for media buyers, affiliates and agencies serving clients including Pepsi and Starbucks. Co-built two products from scratch in a team of 8 engineers + QA.

Impact Highlights
  • Launched an autonomous campaign agent for creative generation and publishing
  • Built optimization workflows for budget, pausing and variation decisions
  • Cut key analytics dashboard loads from ~30s to near-instant
NODE.JSNESTJSOPENAICLAUDEMONGODBAWS
impact-summary.log
[09:41:22]CASE_STUDY: TRACKBOOST
[09:41:23]BUILT: Autonomous campaign-launching agent
[09:41:24]AUTOMATED: Claude content pipeline for RSOC campaigns
[09:41:25]INTEGRATED: 9+ traffic sources and affiliate networks
[09:41:26]SCALED: 70 GB MongoDB store and scheduled stats jobs
[09:41:27]OPTIMIZED: dashboard load ~30s -> near-instant
[09:41:28]STATUS: AVAILABLE FOR CLIENT PROJECTS
> _

Full-Stack Developer · TrackBoost

Jun 2023 — May 2026
Hybrid · Kraków

AI-powered ads-optimization platform for media buyers, affiliates and agencies. Co-built two products from scratch — trackboost.com (AI co-pilot for advertisers) and digital.trackboost.com (analytics & team-management dashboard) — in a team of 8 engineers + QA, serving clients including Pepsi and Starbucks.

  • Built an autonomous AI agent that takes an offer + reference and launches a full ad campaign end-to-end — generating images and headlines via OpenAI and pushing creatives live to traffic sources.
  • Designed an LLM-based campaign optimization engine that analyzes live performance against affiliate-marketing rules and recommends budget changes, pausing, and new creative variations.
  • Built integrations with 9+ traffic sources & affiliate networks (Facebook, TikTok, Instagram, YouTube, MGID, Taboola, Outbrain, Revcontent, Line, Tonic).
  • Designed an n8n + Claude Opus content pipeline auto-generating RSOC articles for Tonic at scale; ran in production for months.
  • Architected the scheduled stats-collection layer — hourly/daily BullMQ jobs across hundreds of campaigns and thousands of ads.
  • Built a real-time analytics dashboard over a 70 GB MongoDB store + multiple SQL databases; cut key dashboard load times from ~30s to near-instant.
  • Shipped an AI ad-creative editor and an influencer-management system (talent CRM, campaign tracking, reporting) for agencies.

Full-Stack Developer · Freelance

2024 — Present
Remote

Designed and shipped websites, booking systems and a Telegram bot for independent clients across fitness, wellness and education — owning the full delivery cycle from requirements and design to deployment and handover.

  • Fitness-coach booking site with service signup, lead capture & email notifications (React + Node.js).
  • Dance-course landing & registration platform (React, Node.js, Astro).
  • Podiatry-clinic site with appointment booking and contact functionality.
  • Telegram bot with full PayPal payment flow + Google services integration.
  • Cross-platform mobile app (side project) with React Native and a Node.js backend.

BSc, Intelligent Systems · Technical University of Košice (TUKE)

2022 — 2025
Slovakia

Thesis: "Integrated Development Environments for Work with Large Language Models." Designed and implemented a Retrieval-Augmented Generation (RAG) pipeline as the core technical contribution, grounding LLM responses in a custom knowledge base.

Technical depth

Selected Engineering Projects

001

Autonomous Ad Agent

End-to-end campaign launcher for affiliate marketers: takes an offer + reference, generates images and headlines via OpenAI, assembles creatives, and pushes them live to traffic sources. Replaced hours of manual creative production per buyer.

OpenAINode.jsAgentBullMQ
002

LLM Optimization Engine

Campaign optimization engine that analyzes live performance against affiliate-marketing rules and recommends concrete actions — budget adjustments, pausing underperforming creatives, and generating new variations.

LLMNestJSRules Engine
003

Claude Content Pipeline

n8n + Claude Opus pipeline auto-generating RSOC articles for Tonic at scale. Ran in production for several months, producing multiple campaigns per day with zero manual writing.

Claude APIn8nAutomation
004

Real-time Analytics Dashboard

Live dashboard with charts aggregating a 70 GB MongoDB store and multiple SQL databases across all integrated traffic sources and campaigns. Cut key dashboard load times from ~30s to near-instant.

MongoDBRedisChartsNode.js
005

AI Creative Editor & CRM

In-app AI creative editor to generate and refine ad images and copy, removing dependency on external design tools — plus an influencer-management system for agencies with talent CRM, campaign tracking and reporting.

OpenAIReactNestJS
006

RAG Pipeline (BSc Thesis)

Retrieval-augmented generation over a custom knowledge base — vector-search retrieval combined with LLM generation, built into an IDE for working with LLMs. Core technical contribution of the thesis.

PythonRAGVector DBLLM
Engineering Toolkit

Tools I Use to Ship Products

A focused stack for building full-stack products, AI automations, dashboards, payment flows and integrations.

LANGUAGES
JavaScriptTypeScriptPython
BACKEND
Node.jsNestJSExpressDjangoREST APIsMicroservicesBullMQWebSockets
FRONTEND
ReactReduxAstroReact NativeHTMLCSS
DATABASES
PostgreSQLMySQLMongoDBRedis
CLOUD & DEVOPS
AWSGCPDockerCI/CDLinuxVPS
AI & AUTOMATION
OpenAI APIAnthropic ClaudeRAGVector DBsPrompt Engineeringn8n
INTEGRATIONS
Facebook AdsTikTok AdsInstagramYouTubeMGIDTaboolaOutbrainRevcontentLineTonicGoogle APIsPayPal
TESTING & TOOLS
JestGitGitHubPostmanAgile/Scrum

About

Full-Stack Developer with 3 years of production experience building AI-powered SaaS platforms end-to-end — from greenfield architecture to scaled features used by 200+ media buyers and agencies serving brands such as Pepsi and Starbucks.

Backend-leaning generalist across Node.js, NestJS, Express and Python, with strong React/Redux on the frontend and confident handling of MongoDB, PostgreSQL, Redis, BullMQ and AWS/GCP. Shipped multiple LLM-driven features in production — an autonomous campaign-launching agent and a Claude-powered content pipeline. Comfortable owning a feature from spec through deployment.

AVAILABLE · OPEN TO WORK
LOCATIONKraków, Poland
FOCUSFull-Stack · Backend-leaning
EXPERIENCE3 years · production SaaS
EDUCATIONBSc Intelligent Systems · TUKE
CONTRACTB2B (JDG) · Employment
AVAILABILITYRemote / Hybrid
LANGUAGESRU · UA · SK (C1) · EN (B2)

So… what are we building?

Drop me a line about the product, automation or site you have in mind — I reply faster than my CI (usually within 24h).

Russian NativeUkrainian NativeSlovak C1 · Near-fluentEnglish B2 · Upper-Intermediate
Hire me