Jaroslav Vorobey
Verified Expert in Engineering
React Developer
London, United Kingdom
Toptal member since February 17, 2022
Jaro is a startup founder who has previously worked at JPMorgan Chase & Co. and Deutsche Bank AG, with more than four years of experience ideating and overseeing the delivery of exceptional software. He excels in React, TypeScript, Next.js, Node.js, Firebase, and Google Cloud. A fast and thorough learner of new technologies and a native English and Italian speaker, Jaro enjoys working on challenging products and delivering outstanding results.
Portfolio
Experience
- Node.js - 7 years
- Next.js - 6 years
- JavaScript - 6 years
- React - 6 years
- Tailwind CSS - 5 years
- Google Cloud - 5 years
- MongoDB - 3 years
- System Architecture Design - 3 years
Availability
Preferred Environment
Firebase, MongoDB, Node.js, React, JavaScript, TypeScript, GitHub, Bitbucket, Slack
The most amazing...
...project I've created is Winfluencer.io, a web app for YouTubers I built from scratch using React, Node.js, Material UI, Firebase, and the YouTube API.
Work Experience
Founder
ReviveDeadLinks
- Built a complete SaaS product from idea to first paying customer in under seven days.
- Documented how I launched the product at incredible speed on YouTube: https://www.youtube.com/watch?v=HVfIGpAe7pQ.
- Built it using Next.js, React, Tailwind CSS, TypeScript, Vercel, Prisma, Google Cloud, PostgreSQL, MySQL, NextAuth.js, and Stripe.
Founder
RealGreatDevs
- Created the world's largest database of open source developers, currently with over seven million developers and more than one million developers with email.
- Wrote custom scrapers to gather this information quickly and cost-effectively. Currently, it is scraping at a rate of 150,000 new developers per day. Avoided bot detection using new evasive techniques.
- Created 50,000 unique SEO results pages programmatically, which are ranking on Google.
- Managed multiple developers to ship products quickly and without bugs via effective CI/CD automated deployments.
- Designed and built the UI using Next.js (App Router), React, Tailwind CSS, TypeScript, NextAuth.js, Prisma, and PostgreSQL.
- Created and optimized multiple scheduled cloud functions on Google Cloud to run in parallel, retrieving thousands of data points per second.
Founder
3Cells
- Created a web scraper in Puppeteer and Node.js that gets thousands of emails weekly and automatically sends personalized emails.
- Headed the company's sales, marketing, finance, and strategic direction.
- Created a production application from scratch using React, Material-UI, Firebase, Google Cloud, and YouTube API.
- Managed multiple team members to achieve weekly objectives.
Lead Software Engineer
Hawaii Life
- Developed a complex Next.js progressive web app CRM with custom authentication, full Salesforce integration, Google Maps embeds, and dozens of custom responsive screens built with React and Tailwind CSS.
- Created a custom ORM to map fields from the web app to Salesforce, using Salesforce as the single source of truth.
- Presented the product to key stakeholders, such as the firm's head of technology, and received a very positive response.
Lead Software Engineer
Reach Digital
- Created analytics platform in React, TypeScript, Node.js, Next.js, and MongoDB.
- Deployed 10+ Next.js projects to Vercel for multiple eCommerce clients integrating with Shopify and Stripe API.
- Defined the startup's product strategy with the CEO, outlining goals and deliverables. Outlined the MVP and what it should achieve. Evaluated what features to keep and cut based on relative added value to customers.
- Designed the client- and server-side architecture, considering strict real-time responsiveness and scalability requirements, which led to its deployment to the cloud.
- Oversaw the product launch, helping onboard initial customers while using their feedback to create additional value for the product. Consulted the CEO on the product's scalability and potential long-term solutions to strategic challenges.
- Created DevOps CI/CD pipeline and managed deployments to Google App Engine and Cloud Functions.
- Reverse-engineered Meta Pixel and created a pixel competitor from scratch in JavaScript, which is currently used by tens of eCommerce clients.
Lead Software Engineer
Raise Financial
- Recreated the company's existing Ruby platform in React, Next.js, and Prisma, matching functionality one-to-one.
- Communicated with stakeholders effectively, summarizing current progress, estimates, and potential risks to delivery.
- Consulted the CTO on product direction and technical evaluation of key deliverables.
- Integrated payments using Stripe and Plaid APIs, designing complex logic involving the custom generation and parsing NACHA files.
- Added new UI components using React and Tailwind CSS.
Full-stack Software Engineer
Deutsche Bank
- Created a multi-department release management system using React, Material-UI, CSS, Redux, and MongoDB.
- Owned the project from start to finish, managed other developers, and handled communication with stakeholders.
- Maintained test coverage at 100% throughout development, resulting in zero production issues encountered since release.
Full-stack Software Engineer
JPMorgan Chase
- Developed a complex analytics web application for senior management using TypeScript, React, CSS, and Jira API. This tool became the most significant priority for 2020 in my line of business.
- Volunteered to code a data integrity checker for reference data which was previously populated and checked manually, reducing the workload of two teams by multiple hours each week.
- Implemented real-time monitoring and alerting to improve the application's stability, halving the number of production issues encountered in the following two months.
Experience
Complex Financial SaaS from Scratch | RaiseFinancial
https://www.raisefinancial.comDatabase of 7 Million Open Source Developers | RealGreatDevs
https://www.realgreatdevs.comSaaS: Idea to Customer in 7 Days | ReviveDeadLinks
https://www.youtube.com/watch?v=HVfIGpAe7pQFortune 500 Release Management System | ReleaseNotifier
I developed and led the project, managing other developers, achieving the deliverable ahead of schedule. I was able to maintain code coverage at 100% throughout development.
This project was built with TypeScript, React, MongoDB, and Material-UI. It connects to a Java backend and PostgreSQL via REST API.
Scraped 1 Million Influencer Emails and Made API | Winfluencer.io
https://winfluencer.ioI built this app from start to finish, managed team members, and acquired customers. I used CI/CD on Google Cloud to implement continuous deployment and separate testing environments. I also implemented bundle optimization and lazy loading to 10x performance, leading to significant SEO improvements.
Education
Bachelor's Degree with First Class Honors in Computer Science
University of Bath - United Kingdom
Skills
Libraries/APIs
Node.js, React, Stripe API, Chart.js, REST APIs, D3.js, Social Media APIs, Context API, Gmail API, React Redux, LocalStorage, React Testing Library, Puppeteer, Stripe, Plaid API, Shopify API, Slack API, Google Maps API, Salesforce API, Playwright, React DnD
Tools
GitHub, Bitbucket, Prisma, Git, GitLab, Figma, Microsoft Teams, ChatGPT, Lighthouse, Webpack, Plaid, Trello, Babel, Auth0, BigQuery, Zapier, Google AI Platform, Slack, Amazon CloudFront CDN, Seos, Google Analytics, Sentry
Languages
JavaScript, TypeScript, CSS, HTML, ECMAScript (ES6), HTML5, SQL, CSS3, Python 3, Python, C, Assembly, Java, GraphQL, PHP, C#, Ruby, ES7, ES8, ES5
Frameworks
Material UI, Next.js, Tailwind CSS, Redux, OAuth 2, Express.js, JSON Web Tokens (JWT), Jest, Cypress, Svelte, Ruby on Rails (RoR)
Paradigms
Agile, DevOps, Search Engine Optimization (SEO), Continuous Integration (CI), Microservices, Design Patterns, Mobile Development, Serverless Architecture, Responsive Web Design (RWD), Unit Testing, Lambda Architecture, Requirements Analysis, On-page SEO, Testing, Event-driven Programming, Web Performance Optimization (WPO), Management, REST, Event-driven Architecture, ETL, Responsive, Off-page SEO
Platforms
Visual Studio Code (VS Code), Firebase, Web, Google Cloud Platform (GCP), AWS Lambda, Vercel, Linux, Shopify, Mobile, Amazon Web Services (AWS), Docker, Heroku, Azure, Salesforce, PostHog, YouTube
Storage
MySQL, NoSQL, JSON, Elasticsearch, Databases, Database Architecture, Google Cloud, MongoDB, PostgreSQL, Amazon S3 (AWS S3), Amazon DynamoDB, Cloud Firestore
Industry Expertise
Social Media, Marketing
Other
Communication, Software Development, Architecture, CTO, Startups, Strategy, Consulting, Cloud Infrastructure, System Architecture Design, Server Architecture, Front-end, Back-end, User Interface (UI), User Experience (UX), APIs, Server-side Rendering (SSR), Web Scraping, Storybook, API Integration, Technical Leadership, Serverless, Authentication, OAuth, Autoscaling, Web Development, CSS3 Animation, Single-page Applications (SPAs), Software Architecture, Project Consultancy, Full-stack Development, Front-end Development, OpenAI GPT-4 API, DNS, Front-end Architecture, Data Scraping, OpenAI GPT-3 API, Data Visualization, Data Processing, Slack App, Scraping, Software Design, Scalability, Cloud, Integration, MERN Stack, SaaS, CI/CD Pipelines, Responsive Design, Supabase, Progressive Web Applications (PWAs), Fintech, UI Components, Design Systems, Mobile First, Digital Payments, Card Payments, Stripe Payments, Payment Gateways, Software Engineering, Software Documentation, Technical Architecture, Business Analysis, Dashboards, OpenAI, Google Cloud Functions, Data Extraction, Solution Architecture, Data Modeling, Agile Sprints, Technical SEO, Website Audits, Axios, Charts, Minimum Viable Product (MVP), Large Language Models (LLMs), Frameworks, Customer Relationship Management (CRM), Radix UI, Product Development, SaaS Product Management, Caching, SSG, Static Site Generators, Web Scalability, Application State Management, Core Web Vitals, Lazy Loading, Chrome DevTools, AI Agents, User Authentication, AI Tools, Platform as a Service (PaaS), Software as a Service (SaaS), New Products, Financial Data, Full-stack, Responsive UI, Team Leadership, ACH, Payment APIs, Animation, Leadership, Headless Commerce, Machine Learning, Artificial Intelligence (AI), Vectors, Chakra UI, Remote Team Leadership, Design, Toolkits, Data Science, eCommerce, Performance, Slackbot, Cross-browser Compatibility, Google BigQuery, Mentorship, Cloudflare, Data Privacy, Message Queues, Compliance, General Data Protection Regulation (GDPR), Data Security, Web Marketing, B2C Marketing, Advertising, Milestones, Roadmaps, MVP Design, IT Strategy, Agile Delivery, Server Infrastructure, Infrastructure, Monday.com, Framer, UI Animation, Firebase Cloud Functions, Content Delivery Networks (CDN), Generative Pre-trained Transformers (GPT), HubSpot CRM, Deployment, QR Codes, NextAuth.js, PWA, SEO Tools, Vercel Analytics, Google Search Console, Google Analytics 4, Sitemaps, Linked Data, Programmatic SEO, Tailwind UI
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