REACTIVDEVS

Practical education for developers

Our Mission

ReactivDevs is practical education for developers who want to write production-ready software and use AI effectively. That is exactly why this project exists.


We do not teach you to memorize frameworks. We teach the craft your employer actually wants: git, tests, architecture, CI and the ability to defend your own decisions. And on top of that, how to do all of it several times faster with AI. All of it comes out of a hundred 1:1 lessons delivered, not out of theory.

Online courses, video where it matters

Pick your course

RECOMMENDED STARTPRODUCTION READY FRONTEND DEVELOPER

PRODUCTION READY FRONTEND DEVELOPER

WAITLIST OPEN

The course that came out of a hundred 1:1 mentoring sessions. Git, tests, the API layer, architecture, CI/CD and interview prep. Everything your employer expects and no YouTube tutorial tells you. A certificate at the end.

Free course sample (PDF)
$430$300early-bird price
AI DEVELOPER

AI DEVELOPER

IN PRODUCTION

An online course for developers: build production software faster with AI, the senior way. Stack-agnostic, frontend and backend. Includes the AI Dev Kit, a ready-made repo with skills and agents. A certificate at the end.

Free course sample (PDF)
$430$300early-bird price

Working together 1:1, first 30 minutes free

Or do it with me live

CONSULTATION

CONSULTATION

5 spots left

You have a concrete problem and you need it solved. The first 30 minutes are free: we scope the problem and you leave with an estimate of how many hours it takes and what it costs. After that we just solve it, AI development and Claude Code orchestration, architecture, code quality, frontend (React) and backend (Node.js, Prisma). You only pay for what you actually need.

FIRST 30 MINUTES FREE

$115 / 1h
MENTORSHIP

MENTORSHIP

3 spots left

The first 30 minutes are free: we set the rules, find out where you stand and I put together a roadmap for getting you to the next level. Then an 8-week program for developers who are serious. Eight one-on-one sessions (60 min), ongoing code review of your commits throughout. You finish with a deployed real project and a clear path forward.

FIRST 30 MINUTES FREE

$1,500

START HERE

Grab the free guide

21 pages · PDF

From vibe-coding to production software with AI

A free guide: context over task, plan mode, small steps, quality and security. The foundation the AI Developer course builds on.

DOWNLOAD FREE (PDF)

RESULTS FROM 1:1 MENTORING

What the people I mentored say

20+

clients in 1:1 mentoring

100+

1:1 lessons delivered

28

sessions with the longest client

Long

Senior full-stack developer · 16 sessions

Starting point
Broad awareness of new tech, but plenty of it he had never done for real. His company had no process.
What we worked on
A testing strategy from unit tests to E2E in Playwright, GitHub Actions, secret management, clean code and clean architecture, microfrontends, state management. Plus soft skills: negotiating pay, practising 1:1s and conflict situations.
Outcome
A step up to senior level and, above all, confidence. He can defend his decisions and proposed process changes to his own company.

Honza

Mid-level frontend developer · 12 sessions

Starting point
He knew React but lacked confidence. At work they pushed logic onto the frontend through Next.js even where it did not belong.
What we worked on
A mock interview, React deep dives, the Next.js versus Vite and React Query decision, MSW, his own app in a monorepo, pair programming on data fetching, design patterns and TypeScript, preparation for the coding task.
Outcome
A new job as a strong mid-level developer and a significantly better salary.

Martin

Junior React developer · 22 sessions

Starting point
Coming from the jQuery world. Hand-written fetches, almost nothing on authentication, self-taught from tutorials.
What we worked on
React Query and a generated client from Swagger, login and logout through mutations, react-hook-form and Zod, a generic Input via useController, three sessions on git alone, CI/CD and GitHub Actions, testing, Firebase, Next.js, interview preparation.
Outcome
A complete move from jQuery to React, the right tech stack and a real grasp of the principles. A 180-degree turn and a well-paid junior React developer job, even in this market.

Tobiáš

Entry level, moving off Drupal · 10 sessions

Starting point
Drupal, CSS and JavaScript. React from absolute zero.
What we worked on
Starting a project in Vite, hooks and custom hooks, react-hook-form and Zod, his own FormInput component, React Router and layouts, Swagger and Orval, login and logout, pipelines. Plus working with Cursor.
Outcome
He built an app from scratch, got the React fundamentals down and went looking for a more challenging role.

Zuzka

Junior developer, moving off Angular · 6 sessions

Starting point
An Angular background, no React at all. She wanted to stop second-guessing herself and gain confidence.
What we worked on
Getting into React and state, an Angular versus React comparison, interview preparation, Orval and React Query instead of a hand-written client, query keys and invalidation, working with git.
Outcome
Production-ready fundamentals, real confidence and a new job. Genuinely sharp.

Trusted companies we've worked with

Endorsed by

We're proud of the impactful applications we've developed for a range of clients. Each project reflects our dedication to delivering effective and reliable solutions. Explore some of our key projects below to see the skills and commitment we bring to every endeavor.

Bonami

BONAMI

We all crave something unique. Yet, our homes often look very similar to one another. At Bonami, we believe that your home can be as distinctive as you are. Simply combine a few extraordinary pieces with an affordable foundation, and your interior will gain a whole new dimension.

Crave Delivery

CRAVE

From the best of the Pacific Northwest to the tastes of Modern Asian cuisine, our restaurant partners from across the country have curated a menu thats not only award-winning but also approachable enough for every day dining.

Plotify

PLOTIFY

Plotify is a regulated FinTech company that specializes in providing tenanted, fully-managed, and tax-optimized residential real estate in the USA and UK, with optional instant financing, to accredited investors around the world.

West Tenth

W10TH

West Tenth is your local, small business directory! On West Tenth we're helping you discover the vibrant businesses being run out of the homes of your neighbors. From home bakers to family photographers, interior decorators, stylists, party planners,...

Insights from our valued clients

Testimonials

Long

Long

Praha

"Mentoring with Jakub was one of the best decisions in my career so far. He distilled over a decade of experience into liquid gold and shared it with me over the course of almost half a year. Every session was tailored to my needs - we went through advanced topics like architecture design, clean code, and state of the art techniques, but also soft skills like communication and handling conflict. What I appreciated most was that he never just talked theory - for hard skills he showcased the exact patterns he uses himself, and for soft skills he always had a real life example to back it up. I'm pausing the mentoring to focus on my Master's thesis, but I will be back. Highly recommend him to any developer serious about growing."

Pictures of our workplace vibe

Behind the Scenes

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