Available for new engagements

Principal Engineer & Tech Mentor.
My code is in the Brave Browser core.

Salesforce Certified JavaScript Developer with 22 years of expertise. I help developers master Production-Grade JS/TS, React, Java, and Python, and fast-track their careers from Middle to Principal.

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185+

Stars on OSS Rust Lib

voca_rs on crates.io

Brave

Browser Core Contributor

Production code on millions of devices

Salesforce Certified

JavaScript Developer

View on Trailblazer

Years in Tech

Enterprise to indie products

M.Sc.

Master's Degree in EE

Electrical Engineering

Advanced Tech Mentorship

Salesforce Certified Standards

Stuck at Middle level? Growing into Senior — and eventually Principal — takes more than writing code.

Personal career acceleration and deep architectural dive for developers. From code quality to system architecture.

JS / TS Python Java

Middle → Senior → Principal promotion roadmap
System architecture & code quality
Insider interview coaching (10+ yrs interviewing candidates) + salary negotiation

QA & Automation Coaching

Testing feels like an afterthought instead of an engineering discipline?

Master both manual and automated testing from an engineering perspective. Comprehensive mentoring in QA strategies using JavaScript, Java, or Python.

JavaScript Java Python

Manual + automated testing strategy
Test architecture & CI integration
QA-to-engineering mindset shift

Full-Stack Web Development (React/Node.js)

Salesforce Certified Standards

Tired of slow outsource teams and rewrites every 6 months?

Production-ready engineering. I build robust, high-performance frontends and scalable web applications using TypeScript, React, and Node.js.

Scalable React + TypeScript frontends
Node.js backend architecture
Zero-to-launch (MVP on request)

Note: Development services are strictly focused on the React/Node.js ecosystem. Mentorship and coaching cover a broader engineering stack (Java, Python, QA).

Discovery Call

15 min · Free

We discuss your project, career goals, or team challenges. No commitment, just clarity on whether we're a fit.

Custom Roadmap

Within 48h

I prepare a detailed action plan: tech stack recommendations, timelines, or a personalized learning path.

Execution

Weekly sprints

We work in focused weekly cycles with clear deliverables. Progress you can measure, not vague promises.

EdTech Product

BugEater

Full-stack EdTech platform for learning debugging and code quality.

Built from scratch as an indie product, BugEater demonstrates end-to-end engineering ownership. From a native-compiled Java/Quarkus backend to a lean htmx + TypeScript frontend, backed by Supabase for auth and Postgres — zero shortcuts, zero legacy debt.

BugEater hero section: Master Tech Skills Through Practices

Frontend

htmx / TS

Backend

Java / Quarkus

Auth

Supabase (JWT)

Database

Supabase / Postgres

Open Source · Rust

voca_rs

185 12 612k+

Voca_rs is the ultimate Rust [unicode] string library, implemented as independent functions and on Foreign Types (String and str).

cargo add voca_rs

# Cargo.toml
[dependencies]
voca_rs = "1.15.2"

// usage
use voca_rs::*;
chop::first("manifestum", 4);
// => "mani"

Completed, stable milestone. Used in production by teams at Brave Browser and across the Rust ecosystem. Active engineering continues on BugEater and jZen architectures — see the activity feed below.

Commit history (stable, live from GitHub)

b70a8f0 Return empty string when chop::before is called with the subject's prefix 2026-01
3e4b4cd Enhance documentation for chop::before function 2026-01
deadb4f Revert changes to slice 2025-04
98e3844 Don't use slice_fixed 2025-04
0f024e2 Add slice_fixed to differentiate between 'end at index 0' and 'end at start' 2025-04

GitHub crates.io

a-merezhanyi + jLogic Software + jZenDev · GitHub a-merezhanyi · GitHub

Continuous Delivery

While voca_rs is a completed milestone, engineering work continues on BugEater and on jZen — an open-source Java/Quarkus + Flutter core foundation maintained by jLogic Software, integrating Supabase and Google Cloud into a "Verified Stack" for shipping production apps fast.

301

Stars

Forks

Public repos

github.com/a-merezhanyi · github.com/jlogicsoftware · github.com/jZenDev github.com/a-merezhanyi Fetching live activity…

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More loading real GitHub contribution chart…

Loading recent activity from the GitHub API…

Live data fetched from the public GitHub API on page load — no fabricated numbers.

About the Founder

Entrepreneur. Engineer. Indie Dev.

Salesforce Certified JavaScript Developer with 22 years of hands-on experience. Expert in JavaScript, TypeScript, React, Flutter, Java, and Python. I've shipped code inside Brave Browser, authored OSS libraries with 200+ stars, and coached 50+ engineers to Principal level. I don't just teach syntax — I teach the industry standards that run on millions of devices.

For 10+ years I've also sat on the other side of the table, conducting technical interviews. I know the process from the inside — not just JS fundamentals, but how to actually pass the interview: what evaluators are really scoring, common rejection triggers, and how to present your experience so it lands.

I focus on business outcomes, not vanity metrics. When I mentor, I share the trade secrets that make you promotable: architecture thinking, team dynamics, and the invisible rules that separate Middle from Senior, and Senior from Principal engineers.

JavaScript TypeScript React Node.js Java Python Rust Flutter QA OSS Author jSchool PL

Enterprise Depth

Deep roots in large-scale systems — where reliability, observability, and performance are non-negotiable.

Indie Velocity

From idea to shipped product fast. I know when to optimize and when to move.

Industry Standards

I don't just teach code. I teach the standards that run on millions of devices.

Interview Preparation

10+ years conducting technical interviews, coaching candidates from the inside on how to actually pass them.

Tech Educator & Content Creator

I run a YouTube channel with 200+ videos on JS, CSS, and interview prep. A deep dive into Rust and a series of algorithm walkthroughs have reached 10K+ views, with 1.8K+ subscribers tuning in for how I think through a problem, not just the answer.

“Anatol's work was solid, and he often contributed thought leadership around new and better ways of doing things... He is very organized and reliable, which for inherently uncertain ecommerce projects are key skills to have.”

“It was great to have Anatol on our agile team at Adidas. Even under pressure to meet tight deadlines, it was a joy to work with him because of his positive attitude and dedication to get the work done.”

“...And I don't know a person with better developer skills or JS knowledge than Anatol has. He is a very good leader with all needed soft skills on the highest level.”

“Anatol is a person whose advice is really worth following... It's his most useful skill to explain complex things in simple words. I kindly appreciate how he cooperated with the client and taught their dev team.”

“I had a great opportunity of working with Anatol... Personally, I collected a lot of experience looking at his style of work and leading projects. Highly recommend him for any effective team.”

“He is a prominent developer with a deep understanding of programming... As a mature lead, he always keeps an ideal balance between business needs, best quality, and team satisfaction.”

Certified & Trained By

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Let's work together

Ready to accelerate?

Whether you're a company that needs a senior technical partner or an engineer who wants to reach the next level — let's talk.

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Principal Engineer & Tech Mentor.
My code is in the Brave Browser core.