Certmat Rixia
UA / EN
Back-End Development

What runs
the web lives
in the back.

Certmat Rixia builds quizzes, assignments and real-code challenges around the server-side skills that actually get tested in interviews and production environments. No filler, no abstract theory.

See programs About us
Back-end development workspace with code on multiple screens

Skills that don't expire when the next framework does

Frameworks shift. Syntax changes. But the reasoning behind a well-structured API, a sensible database schema, or a reliable authentication flow stays relevant for years. The platform focuses on that layer — the decisions underneath the code.

High impact · Durable

System design thinking

How to reason about scale, failure modes and data flow before writing a single line.

High impact · Evolving

API contract discipline

Versioning, error handling and consumer expectations — skills that transfer across stacks.

Foundational · Durable

Database fluency

Reading query plans, choosing index strategies and knowing when SQL isn't the answer.

Foundational · Evolving

Security instincts

Injection, auth flaws and data exposure — patterns that repeat regardless of the tech.

What people say after six months on the job

Before the quizzes here I could write Node code but I had no idea why my queries were slow. The challenge on indexing strategies made me rethink a whole table structure at work. My team lead noticed the difference before I mentioned it.

Portrait of Dmytro Havryliuk
Dmytro Havryliuk
Junior Back-End Developer, Kharkiv
Passed technical interview at second attempt

The instant feedback on wrong answers is what got me. Every quiz explains why the other options fail, not just which one is right. That changed how I read documentation.

O
Olena Kravets
Self-taught developer, Poltava

I kept avoiding authentication topics because they felt abstract. The assignment format here forced me to build a working JWT flow with refresh tokens. Now I actually understand what I'm implementing.

V
Vasyl Bondarenko
Mid-level developer, remote
What the investment looks like

Structured access, not a subscription treadmill

Each track is priced per learning path, not per month. You pay for access to a defined set of quizzes, assignments and feedback cycles — not for unlimited access you'll never fully use.

Foundations Track

HTTP, databases, REST design. Suitable for those switching into back-end from another discipline or starting fresh.

Most chosen
Applied Engineering Track

Node.js, Python, auth, deployment. Built around real tasks that appear in technical screenings.

Systems and Architecture Track

Microservices, queues, caching, production decisions. For developers already working and wanting to go deeper.

Full program details
Developer reviewing quiz results and progress on screen

Someone here is probably in a similar position

The front-end developer who wants to stop depending on others for the API

Knows JavaScript well, understands the browser side, but gets blocked whenever the back-end needs changing.

The CS graduate who has theory but no production experience

Passed algorithms courses but hasn't seen what a real database migration looks like under pressure.

The working developer preparing for a senior-level interview

Has shipped features for years but struggles to explain design decisions in an interview setting.

The career changer who has been learning solo for months

Has gone through tutorials but lacks structured feedback on whether the knowledge actually holds up.

What the platform tracks

Quiz content updated quarterly against real job postings

Every quarter the team reviews back-end job listings from Ukrainian and remote-first companies, then adjusts quiz coverage to match. If PostgreSQL JSON functions are appearing in interview questions, they show up here within weeks.

PostgreSQL coverage
88%
Node.js / Express
82%
Auth and security
76%
Docker and deployment
68%
System design tasks
61%
Developer working through a back-end assignment on laptop
Assignment feedback cycle — real code, real errors
Quiz interface showing instant result breakdown
Instant explanation on every wrong answer

When this actually works

The platform is not for everyone and that's fine. These are the conditions under which people get the most from it — stated plainly so you can decide for yourself.

  • 01

    You already write some code

    The quizzes assume basic programming literacy. If you haven't written a function in any language, start with something more introductory first.

  • 02

    You have a few hours per week, consistently

    Sporadic bursts don't work well here. Four hours spread across a week outperforms a single eight-hour session every few weeks.

  • 03

    You're willing to be wrong in front of the system

    The feedback is immediate and specific. Some people find that uncomfortable. It's the mechanism that makes the learning stick.

  • 04

    You have a concrete goal, not just curiosity

    Passing a specific interview, moving into a back-end role, or shipping a feature solo — vague goals tend to stall. Specific ones don't.

  • 05

    You're in or near the Ukrainian tech community

    Content is calibrated to the regional job market. Interview patterns, common stack choices and salary expectations here differ from those in other markets.

  • 06

    You don't expect a certificate to do the work

    The platform issues completion records, but hiring decisions depend on what you can actually do in a technical conversation. The two are related but not the same.

If those conditions fit, the platform is worth a look. If they don't, no harm — the programs page has enough detail to help you decide without committing to anything.

See programs