Vitalii – React, Python, Node.js

This product empowers brands with the technology to embrace circular fashion. This allows the brand's customers to put back on sale their past purchases and get paid back within days.

• Build engineering culture that is attached to company values.
• In charge of hiring process and performance reviews.
• Engineering team career progression guidelines and support.
• Collaboration on Roadmap and alignment with business plan.

Accomplishments:

• Built 3 new teams from scratch (front-end, infrastructure, data)
• Extended backend team from 3 to 6 people
• Coached 2 Senior Engineers who become Tech leads.
• Set up and maintained on-call processes by reducing incidents by 3x and improved average time to resolution from 4 to 2 days.
• Led a team to achieve SOC compliance.
• Started and led a project to optimize AWS infrastructure, which led to 40% savings first year and 50% more during second. This included moving infrastructure into Terraform and optimising the use of Savings plans, ECS and other resources in AWS.

It is an all-in-one platform for creating, sharing, and using generative AI collaboratively.

Vitalii was brought into the project to work with the Founder, who was not a technical Product Owner, to help him bring his idea to life. He worked solo and managed to independently bootstrap and build a solution that could be scaled later once the idea was validated.

• Built and architected the project from scratch by using Next.js, TypeScript, TailwindCSS, and Supabase for database and real-time communication.
• Integrated all available AI generative models and built a way to work with AI agents inside the platform.
• Implemented chat where multiple users can communicate with each other and AI agents.
• Integrated Stripe Payments by combining subscriptions and token-based usage.
• Implemented a complex role management mechanism with public / private channels and spaces.

Revenue analytics and attribution for Shopify apps

Vitalii has been working solo on this project and helping the Technical founder bring the MVP live. His responsibilities include data analysis and creating live dashboards for existing clients.

• Built a new data processing pipeline using Python
• Architectured a new React.js frontend connected to a Fast API backend.
• Built deployments and CI / CD process for all services
• Redesigned frontend/backend communications by moving data through Parquet files to the frontend. This allowed charts to look more dynamic without losing performance.

Debug, troubleshoot, and analyze parallel CI tests in the Cloud. The platform supported Cypress and Playwright.

Vitalii joined the project as an Individual contributor and the first hire to work with the Technical founder.

He worked on very different features that required cross-domain knowledge.

• Built automatic email reports (daily, weekly, monthly) based on Elasticsearch data while improving Elasticsearch performance and the data structures for other modules. Was a key player in planning the reports and designing them. The reports increased user engagement 3 times.
• Optimised and extended Stripe integration. Subscriptions plan management, overage fee payments, invoices, and custom plans support. It decreased the amount of customer support tickets 3 times and allowed the team to focus on new developments.
• Built tests explorer UI component by using custom SVG components and https://airbnb.io/visx which was widely used in the project.

Besides that, he was constantly improving the documentation, and code quality by adding Unit tests and working on daily basics with the Founder to plan new features.

British-Portuguese online luxury fashion retail platform that sells products from over 700 boutiques and brands from around the world. He joined the company as a Performance Engineer to focus on platform reliability and performance.

• Developed the open-sourced tool to run performance tests
• Developed a tool to visualize 1000+ services on a single screen. The tool decreases the amount of time spent on the incident resolution by two times.
• Developed service SLO and SLA which improved platform reliability and decreased amount of incidents.
• Developed a tool to change traffic between different data centers which helped to reduce the time of resolving incidents 3x times.

An online auction house based in New York City selling fine art, including Post-War and Contemporary art, prints & multiples, photography, street art, and collectables

He joined the company as Senior Full-stack Engineer to be a part of a fully distributed team in 4 timezones. He worked through all stacks from a mobile application to backend implementation on various product features.

• Created k8s cluster and moved all services to Kubernetes. This change dramatically improved the deployment process and allowed them to deploy faster and make a few daily deployments.
• Moved legacy PHP and Node.js applications to Python GraphQL API
• Developed early stages of Ipad and iPhone applications.
• Redesigned front-end to make it faster and easier to support, which led to better user engagement.

The product collects, indexes, and attempts to make available every job that has ever been in existence. By making this information easily accessible, the job seeker has the power to research all jobs and companies they might be a fit for.

• Developed search through 200 million jobs
• Built a team of 4 backend and 2 frontend engineers.
• Created scalable AWS architecture based on AWS ECS
• Wrote unit, functional, e2e tests
• Was a part of the early startup and helped with early engineering decisions
• Contributed to yearly and quarterly project goals
• Mentored and evangelized best engineering practices about systems design and code quality.
• Managed ELK stack to provide observability about all microservices.