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Alex Paisiev

@alexpaisiev

Lead Senior Engineer at P3 Bulgaria developing enterprise applications and AI-assisted workflows with Python, FastAPI, and Azure OpenAI.

Bulgaria

Message

At P3 Bulgaria, I contribute to product design and technical coordination for enterprise applications, working across Angular, React, Next.js, Node.js, and .NET.

I developed AI-assisted workflows using Python, FastAPI, and Azure OpenAI, with structured output validation and human review to improve reliability. I also implemented error handling and auditable decision tracking for AI-generated recommendations.

I created scoring rubrics for evaluating AI-generated code and responses, and documented preferences and reviewer feedback from side-by-side comparisons to support consistent training datasets.

Before advancing to Lead Senior Engineer, I progressed through frontend and full-stack roles at P3 Bulgaria, developing reusable interfaces, connecting applications to backend services, and contributing to testing and release collaboration. I began my software engineering career as an intern at Dais Software.

Experience

Work history, roles, and key accomplishments

Current

Lead Senior Engineer

Current

P3 Bulgaria

Sep 2025 - Present (1 year 1 month)

Advanced to a lead position following successive frontend and full-stack engineering roles. Contributes to product design, technical coordination, and AI-assisted workflows using Python, FastAPI, and Azure OpenAI.

Angular React Next.js NodeJS .NET Python fastAPI Azure OpenAI Schema Validation Error Handling Testing Code Review AI Evaluation Rubric Based Scoring

Senior Full Stack Engineer

P3 Bulgaria

Feb 2021 - Sep 2025 (4 years 7 months)

Developed enterprise application features spanning TypeScript-based user interfaces and connected backend services. Built reusable UI components and integrated client-side applications with Node.js and .NET services.

TypeScript Angular React Next.js NodeJS .NET REST API Integration UI Components Testing Collaboration

Intermediate Full Stack Engineer

P3 Bulgaria

Jan 2020 - Feb 2021 (1 year 1 month)

Moved from frontend specialization into broader full-stack implementation and backend-connected application features. Connected web interfaces to server-side APIs and supported data exchange between presentation and service layers.

TypeScript Angular React Next.js NodeJS .NET REST API Integration Frontend Development Service Integration

Junior Frontend Engineer

P3 Bulgaria

Jul 2018 - Jan 2020 (1 year 6 months)

Implemented and supported web application interfaces as part of a software development team. Developed a foundation in reusable interface patterns and frontend development practices.

Frontend Development Web Interface Reusable UI Patterns Application Maintenance Collaboration

Software Engineer Intern

Dais Software

May 2018 - Jul 2018 (2 months)

Completed a software engineering internship with a Bulgarian software provider serving financial services and digital banking clients. Gained initial experience with professional software development processes and web application engineering.

Software Development Web Application Development Fintech