Bachelor's degree

Platform for legal document workflows

Joined the team and, within five months, actively contributed to development and product architecture planning.

Designed and implemented three key services:

PDF Generation — a service that generates PDFs from templates (HTML/Markdown → PDF), with font and i18n support, readiness for electronic signatures, and rendering/stability optimizations.

Core API — the product core (REST/HTTP): domain operation routes, authentication and authorization (JWT/RBAC), endpoint versioning, action auditing; integrations with queues and storage (AWS SQS/S3, PostgreSQL).

Validation Service — asynchronous validation of PDF documents using custom rules built on JSON Logic; rule versioning and reuse, tracing and logging, error handling and DLQ.

Introduced CI/CD practices (automated build/deploy), unit and e2e test coverage, and observability (metrics/logs/traces) to improve reliability and feedback speed.

Applied DDD/Clean Architecture, maintained RFCs/ADRs, and c

Инженер-программист

Legal tech – Email service for lawyers

Started as a full-stack developer, initially focusing on frontend (React, Next.js, Tanstack Query) before transitioning to backend development.
Built a user-friendly, responsive interface while gaining deep expertise in JavaScript and TypeScript.

Betting Exchange Platform

Contributed to both frontend and backend development, working on complex business logic and real-time data streaming.
Designed and implemented REST and stream APIs for real-time bet status updates.
Integrated Firebase Functions, Firebase Auth, and CI/CD pipelines.
Developed unit and end-to-end tests to ensure stability and quality.
Collaborated directly with clients to refine requirements and improve system design.

Social Network

Focused on backend development using NestJS and Node.js.
Set up project infrastructure with CI/CD pipelines and Terraform for automated deployment.
Developed REST APIs and implemented real-time data processing using Kafka, PostgreSQL, and Firestore.

Full-stack Developer

E-signature & Document Automation MVP
- Built an MVP that automated preparation, signing, and delivery of real-estate agreements.

- Designed a lightweight microservice split: Template Service (HTML/MD → PDF), Signature Orchestrator (signing flows, status tracking), Core API (RBAC, audit log, webhooks).

- Implemented async processing via SQS with idempotency keys, DLQ, and retry policies; stored artifacts in S3 with immutable versioning.

- Added CI/CD (GitHub Actions) with smoke + e2e (Playwright) and runtime observability (Grafana/Prometheus/Tempo).

- Impact: cut document turnaround time from days to <2 hours, 99.9% observed uptime over pilot; reduced manual errors by ~40%.

Stack: Next.js, NestJS (TypeScript), PostgreSQL, Redis, AWS S3/SQS, JSON Logic, GitHub Actions, Playwright.

Event-Driven Invoicing & Compliance Validation
- Delivered a service that ingests shipment events and generates compliant invoices with rule-based validations.

- Modeled domain rules with JSON Logic (ve

Software engineer, ceo, cto

Know about Yaroslav Kharchenko's work experience, education, bootcamps, certifications, and much more. Yaroslav Kharchenko