Projects and case studies

Cezyo

Systems analysis and development coordination for a B2B/B2C platform

Cezyo is an e-commerce platform for retail and corporate buyers, sellers and manufacturers. From 2024 to November 2025, I worked as Lead Analyst and also performed project management duties. I established documentation and requirements and organised team planning and coordination. By the end of my involvement, the team had prepared the first release for launch.

Participation started: 2024
Company: Cezyo LLC
Positions in the project: Lead Analyst

Roles and achievements

Responsibilities	My contribution	Results and metrics
Project Manager Development process setup Release scope management Effort planning and control Project team coordination	Joined an ongoing project and established its development process: structured requirements, agreed the first release scope, and organised planning and team collaboration.	The team brought the first release to launch readiness. Delivery gained a shared plan, clear responsibilities and transparent progress tracking.
Systems Analyst Requirements decomposition and documentation Multi-warehouse order design Integration and error-handling design Integration and data-quality requirements Localization design	I designed an e-commerce system, from functional specifications and seller data imports to a multi-warehouse cart, delivery and localization. I documented component interactions and alternative scenarios and supported implementation by developers.	The food-delivery service integration was implemented, tested and deployed, including handling of failures and invalid responses. Seller data imports and delivery selection worked; the multi-warehouse cart was validated with test data. Integrations with major carriers, including CDEK, were exercised in a test environment. My specifications were used to implement localization with dynamic language addition, translator interfaces, developer-entered translations and loading of keys and translations into the database.
Business Analyst Interviews and requirements elicitation User Scenarios / Use Cases Functional decomposition Requirements decomposition and documentation Analysis documentation management	I turned the owner’s vision and verbal requests into connected documentation for development and design. I combined business and systems analysis, from discussing needs to documenting scenarios, processes and task specifications.	A complete documentation set was created from scratch, from product vision to individual task specifications. Functional modules, user and system scenarios, relationships, attributes and required reference data were documented. Shared repositories of values, parameters and components were established.
Full-Cycle Software Engineer + AI Internal tool development Resource validation and synchronization	At Cezyo, a large B2B/B2C marketplace, I worked as project manager, business analyst and systems analyst. I independently initiated and built an AI-assisted internal tool to validate localization keys and publish translations.	Approved by the CTO and team lead, the tool was deployed and remains in use. Manual file exchanges were replaced by a coordinated workflow for frontend, QA, UX and translators.
Results and metrics		I joined after approximately four years of development without a released version or unified documentation. Working with the owner, I documented the product vision, business model and technical overview in Notion, along with processes, user scenarios, screens and interface behaviour. I then prepared development specifications, system requirements, alternative scenarios and test descriptions. The analyst, tester and owner received daily automated test reports. I organised work in OpenProject using a backlog, epics, sprints and assigned responsibilities across design, frontend, backend and testing. I coordinated a core team of approximately ten people through team leads and directly with contributors. I agreed the first release scope with the owner and explained the impact of changes on time and resources: new requests required a revised plan or went into the backlog. I specified complex ordering and delivery scenarios, studied partner APIs and resolved technical questions with external developers. Key ordering scenarios were implemented and validated with test data; validation with real data remained the next step. One delivery integration was validated in real operation, while the others were tested in a test environment.
Results and metrics		The core platform used React, PostgreSQL, PHP, REST APIs and OpenAPI. Integration components were developed as Python/FastAPI microservices. By November 2025, migration of other components was only beginning; the main frontend interaction still used PHP. These are technologies of the system I analysed and coordinated, not a claim that I personally developed every component.

Competencies and skills

Business & User Requirements
User Scenarios / Use Cases
Requirements decomposition and documentation
Interviews and requirements elicitation
AS-IS / TO-BE process analysis and modelling
Integration and data-quality requirements
Requirements traceability and change analysis
Analysis documentation management
Integration and component interaction design
Alternative scenarios and error handling
Order processing algorithms
Localization system design
SQL scenario validation
API validation and implementation support
Stakeholder Management
Cross-functional team leadership
Distributed team management
Implementation and sprint planning
Schedule planning and control
Scope and change management
Work breakdown and effort estimation
Planned versus actual effort analysis
Capacity and resource management
Risk and dependency management
Development process setup
API and integration design
Existing-code analysis and evolution
Engineering task decomposition for AI
Review of AI-generated code
Frontend, backend and database integration
Internal tools and automation

Tools and technologies

OpenProject
Notion
SQL
PostgreSQL
OpenAPI
Postman
FastAPI
Python
ChatGPT
HTML5 / CSS3
JavaScript
Framework7
Cordova / Android APK
React
PHP
REST API
MySQL
Node.js / npm / Vite

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