Jonasz Wiącek

Open-source auto-generated admin panel and dashboard designed for Node.js applications. Implemented various connectors and adapters facilitating seamless integration into Express, NestJS and Hapi frameworks with compatibility across Sequelize, MikroORM, TypeORM, and Mongoose ORMs. Oversaw the upkeep of a production-ready library, addressing user-reported issues and incorporating new features.

Blockchain-based application developed for energy companies and energy consumers. Implemented mechanism for the matching of energy consumption and generation data while securely recording green energy certificate transactions on the blockchain. Ensured reliable, stable and high-throughput data synchronization with a blockchain.

Successfully orchestrated an eCommerce platform tailored for automobile sales. The project included frontend components for cars presentation, automated order processing, invoice and order document generation, and a robust administration panel. Integrated third-party systems including CRM, notifications, invoicing, contracting, and lead collection. Implemented MongoDB aggregation pipelines and CI/CD pipelines using Cloud Build and Cloud Run.

Constructed a platform for executing end-to-end tests on remote EC2 instances. Organized test runners into scenarios, each executing specific test cases while recording video content. Assessed video quality using various metrics, ensuring robust testing capabilities. Had full project ownership from requirements gathering to deployment.

Authored a solidity-based smart contract to oversee distributed voting sessions. Implemented a whitelist-based node system, allowing votes based on configurable majority rules. Subjected the contract to rigorous testing and a comprehensive security audit. Responsible for implementation of recording votes, majority algorithm, integration testing and security fixes.

Designed a dynamic dashboard empowering administrators to craft and customize static pages based on predefined layouts. Content was easily populated with custom and dynamic data, and HTML pages were generated automatically and accessible via specified domains. Fully responsible for requirements gathering, architecture design, tech stack selection and implementation.

Integrated blockchain technology to create a platform for tracking sustainable aviation fuel volumes and generating green energy certificates. Modularized IAM, certificate management, and customizable dashboard components. Employed a generic approach to construct forms and pages based on JSON schemas. Implemented dashboard widgets, SSO, Cypress tests and user flows using state machines.

Developed a dating web application with features for scheduling meetups and events. Utilized MongoDB, TypeScript, Hapi.js, React, and PWA technologies. Implemented a robust calendar-based booking system for scheduling user interactions.

Developed an AI chat widget for an application that helps run and generate Playwright-based tests. Created an AI chat interface that allows users to fix test code, generate test code based on current context (HTML of the page, page images), use an inspector to select elements by clicking on the page, choose from different LLM models, and switch between thinking modes.

Developed and deployed a standalone REST API service for efficient image and video processing. Engineered a real-time statistics system for a call center application, improving performance and data accuracy. Researched and organized workshops on event sourcing, Apache Kafka, compilers, and AWS services.

Implemented a sophisticated debugger-like tool that leverages TypeScript's Abstract Syntax Tree (AST) to enable line-by-line code execution, step-into functions, loop control, dynamic code evaluation, and runtime code injection. This project demonstrates deep understanding of TypeScript compiler internals, AST manipulation, and debugging tool development.

Built a comprehensive real estate listing aggregation platform that scrapes and consolidates property listings from multiple sources. Implemented intelligent duplicate detection algorithms, comprehensive edit history tracking, price change monitoring, advanced filtering and search capabilities, and detailed pricing statistics. Integrated Stripe for subscription-based access control, ensuring secure and monetized access to the aggregated data.