Dávid Kolembus

- Backend architecture for an international AI SaaS product (PHP 8.1, Yii2, Docker) — independently designed and shipped product features end-to-end, from API design to deployment, including architectural calls like decoupling local config from third-party provisioning to avoid wasting API resources.

- Queueing and async processing — designed and extended Redis-backed queue channels (yii2-queue) for text, image, video generation and AI agent tasks, plus scheduled cron jobs for billing cycles and background processing.

- Relational and non-relational databases — modeled data in MariaDB (relational, migration-driven schema) and used Redis as cache/queue/session store; designed a multi-tier memory system (per-chat, thread-level, global) with configurable limits.

- API integrations, provider/microservice-style architecture — connected and orchestrated multiple external AI providers (image, video, audio, LLM) behind a unified API layer with capability-based model routing.

- Code review and team collaboration — active participant in CR cycles, working in a Dockerized environment with a GitLab CI pipeline.

For the past year I've been working with Blueghost as a backend developer.
I've worked in a bigger team working on many,many different projects.
From eshops to CRM systems to different tools and sites.

I've even worked with no-code, low-code tools such as Bubble.io and Tabidoo.

At StartItUp I was assigned as a code owner for the subscription platform.
I've worked on customizing and extending REMP, an open-source subscription CRM system by Denník N.

This was my first experience with Nette and extending open-source projects.

At GRÜN Software Group I had the task to modernize the development environment.
I've moved the codebase to git, deployed CI/CD pipelines and I've deployed custom internal apps.

Among many things I've worked on is a custom Sentry-like error aggregation tool with local AI stack.
I've also made a code review tool and a better way to keep consistency between business logic of .NET and PHP apps.

During a transitional period I was working as a developer at Holokolo.
I've been mainly assigned to a development of a full-site test suite.
I've used Selenium and PHPUnit for both end-user testing and unit testing.
Stress testing was also a part of the suite and all of this was implementedwith automated CI/CD pipelines / Jenkins.

Dedoles was my first ever job.
I came in having never written a single line of PHP and came out as a capable junior.

Being introduced to PHP through a big codebase in Laravel, and collaborating with Ui42 was a godsend.
I still carry and use a lot of knowledge from this experience.