Open to opportunities

Kristiyan Simeonov

@kristiyansimeonov

Senior Software Engineer specializing in scalable backend systems and AI engineering (LLMs, RAG, agents) for cloud-native products.

Bulgaria

Message

What I'm looking for

I’m looking for a role where I can own backend and AI system architecture end-to-end—building reliable LLM/RAG applications, event-driven platforms, and cloud-native infrastructure with strong engineering standards and measurable performance goals.

I’m a Senior Software Engineer with 10+ years of experience designing and delivering scalable backend platforms, AI-powered applications, and cloud-native systems across enterprise automation, financial technology, and intelligent data processing. I own systems end-to-end—from architecture and backend development to cloud deployment, monitoring, and production optimization—bringing practical rigor to performance, reliability, and scalability.

In my recent work, I architected a production AI Agent Platform using LLMs and RAG pipelines for 2,000+ users, building AI reliability mechanisms like guardrails, audit logging, evaluation frameworks, and response monitoring. I also engineer high-throughput event-driven systems and data pipelines (e.g., Kafka, Spark, Airflow, PostgreSQL, BigQuery), and I’ve driven measurable improvements such as reducing API latency by 45% and increasing data freshness by 65% through asynchronous patterns, caching, and performance tuning.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Concentrix

Jan 2023 - Jan 2026 (3 years)

Architected and delivered a production AI Agent Platform using LLMs and RAG pipelines to automate investigation, document analysis, and knowledge retrieval workflows. Developed backend services and optimized data pipelines and API latency using asynchronous patterns, caching, and cloud infrastructure.

Full Stack Engineer

Cognizant

Jan 2020 - Jan 2023 (3 years)

Developed a large-scale data and analytics platform with real-time dashboards, including backend services for streaming and batch processing. Built AI-powered analytics capabilities and designed scalable APIs and microservices with strong availability and CI/CD automation.

Python fastAPI React PostgreSQL Redis Kafka Real Time Analytics data transformation Vector Search Classification Recommendations Scaling APIs Microservices Authentication Caching Strategies Database Optimization CI CD GitHub Actions Testing Automation

Software Engineer

Berg Software

Jan 2019 - Jan 2020 (1 year)

Created a document automation platform for uploading, analyzing, classifying, and extracting information from enterprise documents. Built backend services for OCR/NLP extraction and search, and developed a React interface for reviewing results and managing document workflows.

Python Flask PostgreSQL Elasticsearch Redis NLP Extraction Workflows Search Capabilities Validation Rules Workflow Automation React

Backend Developer

NTT Data

Jan 2017 - Jan 2019 (2 years)

Developed backend services for authentication, billing, reporting, and customer management using Node.js and Python Django. Implemented secure APIs, database optimizations, asynchronous processing with Celery/Redis/BullMQ, and automated testing/CI/CD pipelines.