Pavlo Popeskul

Architected and led the backend platform of a social video app. Led two Backend Leads and one Frontend Lead, 10+ engineers, while writing critical-path code myself. - Payments ledger from scratch: double-entry, integer money, idempotency keys, transactional outbox, kill switch on drift over one dollar - Content safety layer on self-hosted Llama models, off the request path - Search service: two cache layers, circuit breaker, under 250ms p95 - Advertising domain: escrow, count-then-charge, budget caps

- Designed and built backend systems for processing large-scale crypto transactions - Integrated with various exchanges, blockchain platforms, and payment gateways - Optimized PostgreSQL and Redis usage for performance and scalability - Implemented asynchronous messaging with Kafka - Enabled observability with logging, tracing, and metrics systems - Tech: Go, PostgreSQL, Redis, Kafka, gRPC, Docker, Kubernetes

Implemented efficient and scalable Golang code to optimize system performance, utilizing various routers tailored to specific tasks. Developed and maintained Microservices architectures, ensuring seamless system scalability and reliability, leveraging Docker, Kubernetes, and monitoring with ELK and Grafana. Implemented gRPC protocols using Protobuf for enhanced inter-service communication, with logging and monitoring through ELK. Worked with GitHub and Jenkins for CI/CD pipeline automation, ensuring smooth

Developed backend services using Golang, integrated with Postgres and Docker, ensuring smooth and reliable operations. Conducted API testing with Postman and Swagger, ensuring comprehensive and reliable backend service testing. Developed frontend consumers using React, TypeScript, and Redux, delivering user-friendly interfaces with RESTful API integration. Integrated Kafka for handling distributed messaging across services, ensuring high availability and scalability.

Designed user interfaces using React, Apollo for GraphQL integration, and Material UI to enhance the overall entertainment experience. Implemented backend using Node.js and Apollo Server, ensuring seamless communication between the client and server through GraphQL. Developed a search feature using Elasticsearch and GraphQL, allowing users to search social media posts based on specific keywords. Communicated regularly with UK-based clients, ensuring clear project updates and timely delivery. Applied Code Sp

Optimized legacy UI using React, Redux, and Ant Design, and enhanced backend systems with Node.js and Express, improving system performance and scalability. Collaborated with US-based stakeholders using tools like Jira and GitHub, ensuring project goals were met and delivered on time. Used Webpack Bundle Analyzer to optimize the application build and improve performance.

Node.js and React for medtech and fintech clients on AWS

React and TypeScript

Developed front-end solutions using JavaScript.