CRM & internal tools
Systems for customers, orders and internal processes, configured around the way your company actually works.
Independent full-stack developer · since 2012
DEV. DROZD <Full Stack />
CRM & internal tools
I help companies launch and develop CRM systems, internal tools and online stores. I improve existing PHP/MySQL applications, connect external services and solve performance problems. You work directly with me, from the initial estimate through launch and source-code handover.
business/system.php
since 2012
// Business application — PHP / MySQL final class Kernel { public function __construct( private Router $router, private Database $db ) {} public function handle(Request $request): Response { $t = microtime(true); $route = $this->router->match($request); $data = $this->db->query($route->sql()); return new Response($route->render($data), [ 'X-Render-Time' => round((microtime(true) - $t) * 1000, 2) ]); } }
Backend and data✓
Interfaces and integrations✓
Maintenance and handover✓
14+
Years of experience
commercial development for businesses
1:1
Direct communication
with me at every stage
360°
Whole-system view
data, logic, interface and future development
EUR
Two working models
fixed-scope stages or hourly work
01 — Services
Solutions for your business needs
I work on new and existing products: CRM systems, internal tools, online stores and integrations. I first examine the business processes, current code and constraints. I then propose a clear scope, stages and a solution that can be maintained and developed after launch.
PHP/MySQL improvements
I examine existing code, add features, fix bugs and identify the causes of slow performance.
Online stores & integrations
I develop online stores, connect external services and configure data exchange through APIs.
Data and business logic
I design data structures, optimise SQL and connect server-side logic with business processes.
Web interfaces
I create clear working interfaces that help employees handle everyday tasks efficiently.
Mobile applications
I complement web systems with Flutter and React Native applications and develop existing Apache Cordova projects.
02 — Technologies
Tools chosen for the task
I choose a solution that fits the task and the existing architecture. I use my own components only where appropriate, taking maintenance and a possible handover to another specialist into account.
Backend
PHP
MySQL / MariaDB
SQL optimisation
REST API
Frontend
JavaScript
Dynamic web interfaces
HTML
CSS
Business systems
CRM / ERP
E-commerce
Existing systems
Mobile
Apache Cordova
Flutter
React Native
System architecture
Database design
Performance analysis
Existing product development
CRM / ERP
E-commerce
REST API
Business interfaces
Cross-platform mobile
Project handover
03 — Experience
Experience with business systems since 2012
Senior Full-Stack Developer
Global Development Room · Ukraine
Business systems. Development of CRM and ERP functionality, databases, server-side logic and web interfaces.
E-commerce. Development and performance work for PHP/MySQL online stores.
Mobile. Commercial work with Flutter and React Native applications.
Full-Stack Developer · Freelance
Self-employed
Web development. PHP/MySQL applications and JavaScript interfaces for business tasks.
Databases. MySQL/MariaDB schema design and SQL query optimisation.
Cross-platform applications. Development and maintenance of Apache Cordova applications.
04 — Mobile
Mobile development as an additional capability
I can complement a web system with a cross-platform application or help develop an existing mobile product.
Flutter
Cross-platform development
Commercial application experience
React Native
Cross-platform development
Commercial application experience
Cordova
Established applications
Development and maintenance experience
05 — Approach & languages
I understand the task and deliver a maintainable result
How the work is organised
I first clarify the task, constraints and expected outcome. I then review the current system and agree the scope, stages and acceptance criteria. During the work I show intermediate results, and after completion I hand over the source code and the necessary documentation.
- Review the current system and business processes
- Agree the scope, stages and acceptance criteria
- Hand over source code and documentation
Languages
Russian
Native
Ukrainian
Native
Bulgarian
Basic
English
Technical reading and written communication · Pre-Intermediate
07 — FAQ
Practical questions before we start
Short answers about existing projects, estimates, handover and support.
Can you work on an existing project?
Yes. I first review the code, system structure and constraints. I then explain what changes are needed and how best to divide the work into stages.
What do you need to prepare an estimate?
For an initial estimate, a short task description, the current project state and your preferred timeline are enough. Examples, a list of integrations and an approximate budget help define the scope more accurately.
How are timelines and costs determined?
They depend on the scope, integrations, available materials and the state of the current system. Before a stage begins, we agree the outcome, budget and timeline.
How will we communicate?
You communicate directly with me. I prefer to record requirements and agreements in writing; we agree on the channel and frequency of updates.
What will I receive when the work is complete?
A working result within the agreed scope, the source code and the documentation needed for further development.
What support is included after launch?
I fix bugs in the agreed functionality for 30 days after launch. New features and subsequent maintenance are agreed separately.
Can another developer take over the project?
Yes. I hand over source code and documentation. Third-party components remain subject to their own licences.
Do you always use your own stack?
No. I use my own components where they fit the task. For an existing project, I assess the current architecture first.
