Hire the Best BigQuery Developers
in Poland

The only way to make a success of your AI project: Stable Infrastructure & data flows - Programmed Automations - AI API Integration - AI Agents and RAGs Google Apps Script is the best tool to automate your business processes. Zero operation costs. Google-guaranteed security and stability. We practice AI-assisted development (Google Antigravity, VSCode, Gemini Pro, Claude Code, Codex, Cursor, Copilot, etc.) with full human review of every outcome. We build our own AI agents and RAGs; we work with MCPs — and we can build all of that for you too. Zapier, n8n, and Make are fine for basic tasks — but as soon as you need deep integration, they fall short. And they cost money. Get in touch through direct message, invite me to your project, or book a consultation! ⌛ We will help you save your time! Sound familiar ❓ ⭐ You have a workflow that uses Sheets, Docs, Gmail, Calendar, Drive — and at some point you thought: "this should just happen automatically." ⭐ So you Googled it. Every answer pointed to Zapier, Make, or n8n. You signed up, watched a few videos, built something that almost worked — and hit a wall the moment your use case got slightly specific. ⭐ You asked ChatGPT to help. It gave you a confident answer. You followed it step by step. It didn't work. You asked again. It gave you a different confident, detailed answer. That didn't work either. Two hours became an evening. ⭐ You tried a few more things, spent some money on a paid plan to unlock a feature you needed, and eventually got something running — something fragile, something you don't fully understand. ⭐ At some point you got a hint: Google Sheets and Drive live in the same ecosystem and talk to each other natively. ⭐ You looked into Google Apps Script. It seemed powerful. It also seemed like code. You asked AI to write it for you. It wrote something. It didn't run. You debugged for a while, then closed the tab. ⭐ Now you have a half-working Zap, a script that does 60% of what you need, a growing subscription bill, and a nagging feeling that someone who actually knows what they're doing would do a better job. ⭐ That's where I come in. What I can do for you ❓ ⭐ Help you formulate project requirements, even if you aren't sure about them yet ⭐ Talk through all the details of your idea and put together an initial implementation plan ⭐ Identify potential shortcomings, technology limitations, and help you set priorities ⭐ Clearly point out what needs to happen before we start and after we finish All projects are "technically possible" — but not all are "cost-effective" or "reasonable." How we will do this ❓ 🔥 Initial stage: detailed analysis and planning (kick-off meeting, workflow mapping, project plan) 🔥 Preparation: share necessary resources and account access, sign the contract and NDA if needed 🔥 Data foundation: we structure and clean your data first. We organize it properly and set up retention pipelines so everything downstream is reliable. 🔥 Deterministic automation: once the data is solid, we build rule-based automations that handle the predictable, repeatable work. These don't need AI — they just need to be correct, fast, and dependable. 🔥 AI integration: only at this stage do we bring in LLMs — where they actually add value. Natural language interfaces, intelligent triage, summarisation, anomaly detection, generative outputs. 🔥 Ongoing review: you review developments and provide feedback throughout 🔥 Testing: once development and corrections are complete, you test everything end to end 🔥 Delivery: final corrections, bugs squashed, project concluded 🔥 Aftercare: bugs found later are fixed for free; new ideas become new milestones. How can you be sure ❓ Scroll down and read the feedback from our clients. All words are genuine, all people and companies are real and verified by the platform. Can we show examples of our work ❓ General descriptions — yes. Code or data — no. Most of our work is proprietary and covered by NDAs. Let's get in touch through direct message, invite me to your project, or book a consultation! API integrations we have worked with: Google Workspace, AI Studio, Claude Code, SDLC, JSON, XML, Markdown, Google Sheets, Calendly, GoHighLevel, Codex, AI agents, RAG, MCP, Multi-agent systems, Google Docs, Stripe, Asana, Jira, Slack, Cloud Storage, QuickBooks, HubSpot, Monday, OpenAI API, Gemini API, Firebase, Firestore, GitHub, Harvest, ClickUp, Cerbo, Intercom, Trello, WordPress, Facebook Atlas, Upwork, GMB, Gmail, Tableu, Airtable, Google Calendar, Google Places, Google Place Details, Google Maps, Google Business Profile, GA4, Google Analytics, Google Ads, Typeform, Instapage, CryptoCompare, Bittrex, Invenias, EOD Historical Data + others.

I'm an experienced data scientist specializing in data analysis, preprocessing, and AI-based solutions. I help clients identify when their real problem is in the data rather than needing complex ML algorithms. I excel in solving complex business challenges through tailored solutions and expert consultation. I'm skilled in advanced math (academic level), AI agents, and data visualization (Looker Studio), which can be a stand-alone consultation or a nice bonus to your project! I deliver comprehensive end-to-end solutions - from data provider negotiation to preprocessing, modeling, implementation and documentation. I'm also available for consultation. "Greg knows LLM tools like langchain *really* well. He understood a genuinely tough problem and helped me solve it super fast. Highly recommended!" "Grzegorz Wiktorowicz, is a great financial developer...he understands the problem very quick and and dig that problem in minute manner and sloves it...hoping to catch with him in future projects .thanku" "Thank you very much sir for the super fast and extremely professional algorithm and program creation. I am super happy that we have met and I definetely would like to work together in many many more projects together." "Very professional and quick! Extremally detailed response and provided with ways to improve our business as an extra! We will for sure hire again! Thanks again" With over a decade of experience, I've successfully addressed a wide range of business issues, including internet casinos, sports betting, logistic optimization, and stock trading, among others. Employing detailed analysis and strategic resource planning, I've consistently delivered results that meet or exceed client expectations. Proficient in Python, C, and SQL, I hold cloud-native certifications as a Google Cloud ML Engineer and Data Engineer. Beyond task execution, I possess a deep understanding of methodologies, their strengths, and limitations. My background as a former scientist uniquely positions me to ensure your projects align with best practices and achieve your objectives. My adaptability and extensive knowledge make me an ideal partner for your data science needs. Whether you require data-driven solutions, want to discuss your project's unique demands, or need guidance on best practices, please don't hesitate to reach out. Initial consultations are free, and I'm eager to collaborate with you to achieve your goals. EXPERTISE: - data science and analytics - data engineering and management - Machine learning and AI - Quant trading - Data visualization and storytelling - Cloud engineering - consultation SKILLS: Python (full data stack, incl. Pandas, SciPy, Scikit-Learn, jupyter, plotly) Time Series Analysis/Forecasting (financial, trading, observations, predictions) Data visualisation - Looker Studio Masterclass certification GCP (BigQuery, Storage strategies, ETL, ML, migration, efficiency and cost reduction) - Google Cloud Professional Data Engineer certification - Google Cloud Machine Learning Engineer certification LLM (langchain, pinecone, llama.cpp, transformers, OpenAI, chatGPT) Git, docker, MATLAB, slurm, bash, linux, SQL (GoogleSQL, Postgres, MySQL) Statistics (academic level, incl. data analysis and modelling, Monte Carlo, bootstrapping, hypothesis testing) >> Drop me a massage so we can analyze your needs together (it's free!)

Available now. I set up, rebuild, and optimize GA4, Google Tag Manager, Consent Mode v2, Meta CAPI, Google Ads conversions, and server-side tracking for ecommerce, SaaS, lead-gen funnels, and marketing agencies. If you need tracking built from scratch, I can design the event plan, dataLayer, tags, conversions, and reporting from zero. If your current setup is broken, I can debug the funnel, fix triggers/tags, remove duplicate events, and verify conversions end to end. What I can handle: - GA4 and GTM setup: events, ecommerce, custom dimensions, cross-domain tracking - Google Ads conversion tracking and enhanced conversions - Meta Pixel and Conversion API with deduplication and event quality checks - Consent Mode v2 and GDPR/CMP setups: Cookiebot, OneTrust, custom banners - Server-side GTM for cleaner data and stronger attribution - Shopify, WooCommerce, WordPress, Webflow, Framer, and custom JavaScript tracking - Looker Studio dashboards your team can actually use Why clients hire me: Most analytics freelancers can configure basic GTM tags. I have a developer background, so I can read the source code, inspect the dataLayer, debug JavaScript issues, and build tracking that survives redesigns, plugin updates, and CMS changes. Recent results from Upwork projects: - Helped recover 15-40% of conversion data lost to Consent Mode misconfiguration - Reduced GA4 event duplication by up to 60% through better dataLayer architecture - Improved attribution accuracy with server-side conversion APIs for Google, Meta, LinkedIn, and Reddit - Built reporting dashboards that reduced manual reporting time from hours to minutes Top Rated Plus | 93% Job Success | $100K+ earned | 5,900+ hours | 100+ jobs I am available now and can begin today or tomorrow. Send me your site, ad platforms, and tracking goal - I will start by mapping the funnel and telling you exactly what needs to be fixed or built.

⚡ High-Velocity Developer | 100% Success Rate Need results yesterday? I specialize in rapid, high-quality development powered by 15+ years of expertise and modern AI-assisted workflows. I combine the seasoned intuition of a veteran developer with the speed of today’s best tech. Proven: 100% Job Success Score. Fast: Optimized delivery cycles. Smart: Deep AI integration to 10x productivity and feature set. My technical expertise is extensive, encompassing PHP, Symfony / Laravel Framework, MySQL, and noSQL Databases (MongoDB, Redis). I'm proficient in node.js (socket IO framework, express), and JavaScript (Stencil JS, Ionic, React), and have built APIs using common architectures such as REST and GraphQL. Additionally, I bring to the table experience in managing AWS infrastructure and other servers based on the Linux Operating System specifically for hosting PHP / Symfony projects. My portfolio also includes building HTML mobile apps (Hybrid apps in frameworks like Ionic/Cordova). I’ve worked across a range of industries, including e-commerce, affiliate marketing, real estate, automotive, aviation, courier services, and healthcare. I have very good knowledge of Symfony Components, Doctrine ORM, PSR standards. I have also used across various projects Easy Admin, API Platform, DomPDF, Guzzle, SwiftMailer, Contao CMS and Amazon SP-API libraries. I have experience working with big data solutions - BigQuery, Adverity Datatap, building continuous cost-effective scraping solution and reliable process automations using make com (formerly integromat) Particularly, my most recent projects have been centered around the Symfony framework, granting me continuous and profound expertise in the Symfony / PHP ecosystem. My grasp of software development techniques is solid, including writing clean and secure code, object-oriented development, and designing application architecture with a focus on extensibility and scalability. I have recent experience in building projects that integrate AI features through the OpenAI / Fal APIs. For some significant period of time i was reponsible for building and maintaining shopify websites, including building custom theme, plugins that were enriching logically Shopify and also checkout cusotmisations Beyond just development, I make it a point to grasp a thorough understanding of the entire project from the end user's perspective. My years of experience enable me to provide accurate insights and advice on enhancing your project. What excites me most is problem-solving. I thrive on unraveling complex, challenging issues, and the software industry continually nurtures my knowledge and creativity. I'm also a fan of machine learning, possessing experience in Octave and the R language, along with theoretical knowledge in machine learning techniques. Recently, I have gained experience in building apps utilizing OpenAI APIs, further broadening my skill set. I take pride in being a versatile “one-man army” in Full Stack Development, capable of delivering fast, reliable results. My goal is to handle all your development needs efficiently - so you can stay focused, worry-free. I'm on the lookout for new challenges. If you're interested in working with me, I'd be eager to discuss how I can contribute to your project. Paweł

I design and build scalable, high-performance SaaS and mobile platforms on AWS, Node.js/Python, and React, and support founders through technical due diligence and exit preparation. 4 of my clients have exited successfully. I build code that serves the business: clean architecture, lower costs, and complete IP ownership. Whether you're launching a new product, scaling an existing platform, or preparing for investment or acquisition, I provide the engineering leadership to make your stack secure, scalable, and investor-ready. SPECIFIC CHALLENGES I SOLVE - rescuing projects from vendor lock-in - fixing inefficient development workflows - scaling apps for high-load & enterprise demands - recovering and stabilizing mobile apps - integrating AI into existing products TECHNICAL STACK - Backend: Node.js (Nest.js), Python (Django/FastAPI), C# (.NET) - Frontend: React, Next.js - Mobile: React Native, Flutter - Cloud: AWS (ECS, RDS, Lambda, IoT Core) & Azure - Architecture: Microservices, Event-Driven (Kafka/RabbitMQ), Serverless WHY FOUNDERS & CTOs WORK WITH ME - Zero Hand-holding: I take full responsibility for technical execution, so you can focus on growth and strategy. - Business-Centric Engineering: removing vendor lock-in improves margins, fixing inefficient teams helps hit market windows. - Investor-Ready Results: clean, documented codebases that hold up during audits or exits. --- Need a technical audit and a clear plan to stabilize or scale your product? Let's talk. 📩 Click "Invite" and share your project details.

✅ AWS Certified Solutions Architect ✅ Google Cloud Certified Professional Data Engineer ✅ SnowPro Core Certified Individual ✅ Upwork Certified Top Rated Professional Plus ✅ The author of Python package for cryptocurrency market Currency.com (python-currencycom) Specializing in Business Intelligence Development, ETL Development, and API Development with Python, Apache Spark, SQL, Airflow, Snowflake, Amazon Redshift, GCP, and AWS. Accomplished lots of complicated and not very projects like: ✪ Highly scalable distributed applications for real-time analytics ✪ Designing data Warehouse and developing ETL Pipelines for multiple mobile apps ✪ Cost optimization for existing cloud infrastructure But the main point: I have a responsibility for the final result.