Serhii

Khmelnytskyi, Ukraine
Telegram: @SergeiAnyshyn
E-mail: [відкрити контакти](див. вище в блоці «контактна інформація»)
Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)
[відкрити контакти](див. вище в блоці «контактна інформація»)

Serhii Yedalov
Software Engineer (Backend) — Node.js / TypeScript

Total work experience: 7 years in commercial development — 6 years in Node.js / TypeScript (since
2020), PHP / Laravel before that (2019 – 2020)
Open to: remote / hybrid work

Summary
I design database schemas and APIs, build background-job and real-time pipelines,
set up the servers and CI/CD they run on, and keep them stable as features change. Most of
my work is on AdonisJS and NestJS services backed by PostgreSQL and Redis, running in
Docker — from single APIs to multi-service platforms with auth, billing, payments and
WebSocket gateways. I clarify requirements early and work closely with PMs and QA.
I actively use AI / LLM tools in my daily workflow to raise both the quality and the
volume of my work: code review, tests, refactoring, documentation and log analysis with
Claude Code, backed by my own MCP servers, reusable agent skills and guardrail hooks in
CI and the dev workflow. Generated code goes through the same review and test bar as any
other code. In products, I integrate LLMs where it pays off — document ingestion and
classification, automated review and reporting pipelines — with validation, cost and quality
controls around the model.

Core stack
● Languages / runtime: TypeScript, Node.js, JavaScript; PHP (Laravel) earlier
● Frameworks: AdonisJS 5 / 7, NestJS, Express
● Data: PostgreSQL, MySQL, Redis
● Infrastructure: Docker & Docker Compose, Nginx, Caddy, PM2, AWS (S3, EC2),
GitLab CI/CD, OpenTelemetry
● Integrations: Socket.IO / WebSocket, BullMQ queues, Stripe, Twilio, Firebase push,
Google Cloud Storage & Functions, ClamAV, OpenVPN, Puppeteer (PDF), OpenAPI
/ Swagger
● AI / LLM: Anthropic / OpenAI APIs in backend services, scheduled LLM pipelines
with structured output and validation; LLM-assisted development with Claude Code,
MCP servers, reusable agent skills, guardrail hooks in CI and dev workflow
● Practices: REST API design, microservice boundaries, schema design and
migrations, job scheduling, real-time streaming, monitoring, code review, test
automation

Experience

Software Engineer (Backend) — RexSoft
Khmelnytskyi, Ukraine · June 2020 – November 2026
Backend owner across a portfolio of Node.js / AdonisJS products for international clients: schema and
API design, Docker environments, Nginx / Caddy / PM2 server setup, CI/CD pipelines, monitoring
and code review.
Key projects (Node.js / AdonisJS):
● Multi-service platform reused by several client products (a scooter-sharing service, CRM
systems) — core API, service API, admin CRM, real-time socket broker and provider
integrations on one shared PostgreSQL schema; GitLab CI releases with health checks and
automatic rollback; AdonisJS, PostgreSQL, Redis, BullMQ, Socket.IO, AWS, Firebase push,
Stripe.
● LLM-backed RFP ingestion service — AdonisJS 7: scheduled pipeline that pulls RFP
documents, extracts and classifies them through an LLM into structured PostgreSQL records
served over an HTTP API, with validation and cost controls. Alongside it, built reusable agent
skills and dockerised MCP servers (PostgreSQL, browser) for the company stack (AdonisJS
7, PostgreSQL, Redis, Docker Compose, OpenAPI, OpenTelemetry).
● Donations / fundraising platform — microservice backend: auth (incl. guest mode), billing,
donations with contribution statements and transaction reports (PDF via Puppeteer), 2FA over
Twilio, multi-organisation accounts, WebSocket gateway and socket service, Stripe, shared
Swagger module.
● Flag First — AdonisJS 7 API for a mobile team app: OpenAPI-documented endpoints,
session / auth model, Redis-backed rate limiting, media uploads, Docker Compose with
Caddy TLS, GitLab CI auto-deploy.
● Dynamic VPN platform — EC2 instances and OpenVPN microservices created on demand
from an admin panel; core, monitoring and certificate-generator services; zero-downtime
Docker Compose deploys; real-time monitoring over sockets.
● WMM, Comuna — API + admin projects on AdonisJS 5 / 7 with PostgreSQL, Redis, S3 file
storage and Socket.IO; Comuna serves a React Native client for utility meter readings and
bills.
● Also: military streaming CMS (live video from a mobile app, real-time member geolocation,
group and private chat), sales / warehouse CMS (real-time exchange-rate feeds, CSV / XML
export, Socket.IO chat), dynamic forms site (Pipedrive and Google Drive integrations),
game-content site with subscriptions, maintenance of a legacy Laravel 5 product on
DigitalOcean behind Cloudflare.

Software Engineer (Backend) — SoftServe
Remote · Part-time contract, in parallel with RexSoft · November 2021 – March 2023
Projects (NestJS):
● File-management microservice for a large product ecosystem — uploads to Google Cloud
Storage with pre-upload virus scanning (ClamAV), Google Cloud Functions integration;
NestJS, Docker.
● Hotel-room booking microservice — registers booking requests through an internal API;
NestJS.

Software Engineer (Backend) — Devloop
Khmelnytskyi, Ukraine · June 2019 – June 2020
Built projects from scratch in Laravel (PHP, MVC, MySQL, Redis, Nginx, Linux, Git): REST APIs,
caching, Google Maps / Geocoding and Facebook API integrations; backend role in the team, also
wrote frontend scripts (JavaScript, jQuery / AJAX, Vue.js, Bootstrap).
Projects (PHP / Laravel):
● Courier goods-distribution service with a mobile app.
● Company / employer / freelancer registration and search.
● Information and entertainment portal — forum, chat, statistics, video stream.

● Utilities services platform — payments, Word document generation, SMS mailings.
● Visa and immigration support site — server-side video streaming, multilingual, paid
content.

Education
● Khmelnytskyi National University — Master's degree, Computer Engineering ·
2014 – 2017
● Khmelnytskyi Polytechnic College — Associate degree, Computer Engineering ·
2010 – 2014
● Avivi Academy — web development course: PHP, Laravel, MySQL, JavaScript, Git,
Google Maps & Geocoding APIs · Nov 2018 – Jun 2019

Languages
● Ukrainian — native
● English — Upper-Intermediate (B2)