Богдан

Bohdan Tsekhmeistruk [open contact info](look above in the "contact info" section)

Backend Developer [open contact info](look above in the "contact info" section) (mobile)

[open contact info](look above in the "contact info" section) (mobile)

Plzeň, Česká republika

[open contact info](look above in the "contact info" section)

t.me/BohdanTsekhmeistruk
github.com/bohdan-tsekhmeistruk


PROFESSIONAL SUMMARY
I’m a Back-End Developer with nearly 5 years of experience building scalable,
high-performance applications using Node.js, NestJS, and TypeScript. I specialize in
high-load real-time systems, AWS cloud infrastructure, and modern AI integrations.
Throughout my career, I have cut database latency by 40%, boosted response speeds by
70% using multi-threading, and successfully designed custom AI agents using
frameworks like Mastra. I am passionate about deep system observability, clean code,
and solving complex architectural challenges.

TECHNICAL SKILLS
● Backend: Node.js, NestJS, Express, Fastify, Socket.IO, PHP
● Databases & ORMs: MongoDB, Mongoose, PostgreSQL, Prisma, Redis, Google BigQuery
● Cloud & DevOps: AWS (CloudWatch, Lambda, S3, Pinpoint, SNS, SES), Docker, Nginx,
CI/CD
● APIs & Integrations: REST API, Stripe, Twilio, OpenAI API, ZohoCRM, Smartlead AI,
Retool
● Monitoring & Observability: NewRelic, Sentry, BetterStack, OpenTelemetry
● Testing & Tools: Jest, Git, Jira, Load Balancer, Threads/Workers

PROFESSIONAL EXPERIENCE

Middle Back-End Developer 01/2026 – 08/2026 (7m)
ScrumLaunch
● Core Backend Services: Developed backend services for BrightSign digital signage
devices, handling device communication and content delivery.
● Internal Tooling: Built internal dashboards using Retool to manage BrightSign devices
and edit internal database tables, streamlining support operations.
● Performance Monitoring: Integrated NewRelic for application monitoring (replacing
Sentry) while maintaining Sentry for session replay and tracing.
● System Observability: Set up BetterStack and OpenTelemetry to collect and visualize
telemetry data, significantly improving observability.
● AI Engineering: Designed and developed custom AI agents using the Mastra
framework; configured a private SearXNG instance on a VPS as a loopback search API.
● AI Tooling & Documentation: Authored comprehensive technical documentation for AI
architectures in Obsidian and leveraged Cursor AI to accelerate development workflows.
● Database Architecture: Architected and maintained relational PostgreSQL databases to
ensure robust and structured data storage.
● Cloud & Operations: Managed application deployments across Vercel and Heroku,
utilizing SolarWinds Logs for infrastructure monitoring.

Backend NodeJS 01/2025 – 11/2025 (11m)
HZF – Gamedev Outsourcing Agency
● Codebase Refactoring: Refactored a legacy B2B system, enhancing code clarity and
improving overall performance stability.
● Automated Testing: Wrote comprehensive unit and integration tests, catching bugs
early and reducing production incidents.
● Real-Time Data: Replaced polling requests with a Socket.IO service to provide real-time
updates for end-users.
● Architecture & Onboarding: Restructured the project architecture to improve
readability and streamline developer onboarding.

Backend NodeJS/Typescript Developer 09/2021 – 01/2025 (3y 5m)
Entrance Agency
● Database optimization: Cut response latency by up to 40% by using MongoDB
indexing and Redis caching.
● Real‑time features: Added Socket.IO for live updates and built a real‑time messenger
with NestJS + Fastify.
● Performance boost: Used Node.js threads and workers to increase response speed by up
to 70% in a high‑load messenger project.
● Payment integration: Built a Stripe payment system handling regular purchases,
subscriptions, and analytics.
● Cloud infrastructure: Set up logging with AWS CloudWatch Logs and Lambda; used
AWS S3 for file storage, AWS Pinpoint and AWS SNS for push notifications and SMS
campaigns, and AWS SES for transactional email delivery.
● Third‑party services: Integrated ZohoCRM for customer management, Smartlead AI
for cold email campaigns, Twilio for VOIP phone validation, and TCPA/DNC/Litigator
lists to avoid SMS violations.
● Marketing & analytics: Implemented SEO, Google Ads, Facebook Marketing, and
Google BigQuery for big data analysis.
● Messenger project: Developed a NestJS + Fastify messenger for real estate, including
multi-thread processing, Socket.IO communication, Dockerized Nginx load balancer,
and a custom Docker Compose configuration to simplify environment setup.
● PHP maintenance: Supported existing PHP e‑commerce projects.

EDUCATION
● Cherkasy State Business College 09/2018 – 07/2022
Junior Specialist, Software Engineering

LANGUAGES
● Ukrainian - native
● Russian - native
● Czech - Elementary
● English - Upper-Intermediate (B2) (writing/reading, speaking)