Богдан

Bohdan Bulakh
Backend Developer
Email: [open contact info](look above in the "contact info" section) | Telegram: t.me/Bo_h_dan
LinkedIn: [open contact info](look above in the "contact info" section) | GitHub: github.com/bohdanbulakh
Location: Ukraine

SUMMARY
Backend Developer with production experience building software as a service (SaaS) platforms in NestJS and
TypeScript. Skilled in designing billing systems, orchestrating distributed workflows with Temporal, and building
reliable REST and public APIs. Strong problem-solving skills and attention to detail, with a focus on backend
performance, data integrity, and clean, maintainable architecture.

TECHNICAL SKILLS
Languages & Runtime: JavaScript, TypeScript, Node.js
Frameworks & Backend: NestJS, Temporal, REST APIs, WebSockets
Databases & ORMs: PostgreSQL, Redis, Drizzle ORM, Prisma ORM
Cloud & Integrations: AWS S3, Stripe, HubSpot, Svix
Testing & Documentation: Jest, Playwright, Swagger (OpenAPI)
Observability: OpenTelemetry, Prometheus, Grafana, Sentry
DevOps & Collaboration: Docker, Git, GitHub, CI/CD, Jira, Bitbucket, Confluence
AI Tools: Claude Code, OpenClaw

WORK EXPERIENCE
Backend Developer, Signus AI
E-signature and Contract-AI SaaS Platform
08/2025 - Present
● Designed the internal billing & usage-metering system: subscription plans, per-member usage quotas
across 10 metered resources and admin panel for subscription management.
● Built Stripe integration covering the full subscription lifecycle — checkouts, upgrades/downgrades,
renewals, failed payments and refunds — with idempotent, concurrency-safe webhook processing.
● Testing: extensive API E2E suites and Playwright smoke tests across billing, public API, webhooks and
document tools.
● Frontend (React): built the billing/subscription admin panel and the HubSpot embedded applications for
viewing and updating subscription settings of an account.
● Observability: implemented Prometheus/OTEL/Grafana metrics to monitor api performance, authored a
broad suite of Temporal workflows.
● Contributed to backend AI and document-processing features: AI/typed signature generation and 4
document-processing tools with WebSocket progress streaming.
Backend Developer, Student Council of the Faculty of Informatics and Computer Engineering
Igor Sikorsky Kyiv Polytechnic Institute
01/2024 - Present
• Developed and maintained REST APIs using NestJS, TypeScript, and Prisma ORM.
• Refactored Swagger (OpenAPI) documentation and Prisma repositories for improved maintainability.
• Implemented auto-updating of the schedule and improved the schedule parser for optimized data processing.
• Created and improved integration tests to ensure API reliability.
EDUCATION
Igor Sikorsky Kyiv Polytechnic Institute
Bachelor of Software Engineering of Computer Systems
09/2023 - Present

LANGUAGES
• Ukrainian - Native
• English - Intermediate