Давид

DAVID A. Warsaw, Poland • [open contact info](look above in the "contact info" section) • Github

WORK EXPERIENCE
Software Engineer, NDA Jan 2026 - Present
Designed and implemented game aggregation system, extending platform from proprietary-
only games to supporting multiple external providers.
Built tournament system from scratch, enabling competitive gameplay features across the
platform.
Migrated bets history service from PostgreSQL to ClickHouse, achieving 10x query
performance improvement.
Designed a 4-tier progressive jackpot system with async payouts and parallel multi-jackpot
processing under high transaction load.
Built a unified analytics pipeline across 30+ services, standardizing metrics collection for
payments, contribution cycles, probability and margin strategy.
Services/Technologies used:
Go, PostgreSQL, ClickHouse, Redis, gRPC, Microservices, Kafka, Debisium

Software Engineer, Kabina Agency May 2024 – Nov 2025
Spearheaded development of AI-powered lead-generation assistant that autonomously
qualifies website visitors, capturing needs, budget and contact details.
Led end-to-end delivery of WEMU - AI voice assistant platform for 24/7 automated call
handling and bookings.
Built a centralized notification hub aggregating 5+ sources - delivering 100,000+
messages/day via Email and UI to 30,000+ users, replacing five separate implementations
and eliminating duplicate sends entirely.
Implemented anti-spam rate limiting and batch sending - achieved 98%+ email deliverability
and protected domain reputation by reducing peak SMTP load.

Services/Technologies used:
Go, NestJS, PostgreSQL, Redis, Encore, Google Pub/Sub, RabbitMQ, Grafana, Prometheus
LiveKit (WebRTC), Next.js, SvelteKit

Software Engineer, Crossnetics Sep 2023 – May 2024

Developed a scalable social media analytics service for an influencer marketing platform; built a
marketplace ecosystem connecting brands with influencers through data analysis and ranking
algorithms.
Implemented a fiat top-up gateway enabling users to purchase crypto directly via card,
bypassing complex exchanges - reduced entry barrier and attracted new liquidity.
Integrated OpenAI API to bring ChatGPT directly into the app interface with real-time response
streaming, increasing user engagement by 25%.
Services/Technologies used:
Go, PostgreSQL, ClickHouse, Redis, NATS, Centrifugo

Skills: Go, PostgreSQL, ClickHouse, Redis, Kafka, RabbitMQ, NATS, gRPC, Microservices, Docker, REST
API, Google Pub/Sub, Grafana, Prometheus, OpenAI API

EDUCATION LANGUAGES
APEPS department of Igor Sikorsky Kyiv Polytechnic
English (B1), Ukrainian (C1), Russian (C1)
Institute Aug 2018 – Aug 2022