About me

Backend Developer & Systems Architect based in Sofia, Bulgaria. Results-driven with extensive experience in designing and implementing high-performance, scalable, and fault-tolerant systems using Java and Python. Specialize in transforming complex business requirements into elegant, maintainable architectures with strong emphasis on performance optimization, security, and data integrity.

Proven track record building core infrastructure and high-availability platforms for leading iGaming companies, where low-latency processing, regulatory compliance, and zero-downtime operations are critical. Skilled in mathematical modeling, distributed systems, and robust engineering practices to deliver reliable solutions that scale efficiently under demanding workloads.

What I'm doing

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    Java Systems Architect

    Specialized in architecting robust, scalable, and cloud-native Java backend platforms optimized for high-throughput, low-latency environments in regulated, data-heavy industries such as iGaming and finance.

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    Web Development

    High-quality development of websites and apps, built on clean, maintainable code, thoughtful architecture, and clear strategic direction. I deliver scalable, performant, and future-proof solutions for long-term results.

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    Mathematical Modeling

    Applied advanced mathematical and statistical techniques to develop quantitative frameworks for iGaming, including odds modeling, risk analysis, and analytical reporting.

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    Photography

    Enthusiastic amateur photographer with a particular focus on documenting the daily laziness of cats, emphasizing candid composition, timing, and the unique character of highly uncooperative subjects.

Professional Feedback

  • Petar Hristov avatar

    Petar Hristov

    Thank you for your excellent work in creating the ways strategy payout for our slot games. Your innovative approach not only improved the overall design but also laid a strong foundation that will make backend development of ways-based slot games smoother and more efficient in the future. Your effort bridges creativity with technical practicality, and it will directly support me (and the team) in building robust, scalable gamelogic for upcoming games. Thank you for making a lasting impact on both gameplay and development!

  • Viktoriya Hristozova avatar

    Viktoriya Hristozova

    I want to express my gratitude for the dedication and passion you brought to our work this year. Your willingness to share your knowledge, skills, and ideas has been invaluable, and your commitment made every math test we collaborated on a genuine pleasure. Your professional, thoughtful approach sets a remarkable standard and continually elevates the quality of our work. Thank you for investing so much of yourself into what you do and for making such a positive impact on the team.

  • Nikolay Ivanov avatar

    Nikolay Ivanov

    Thanks for always responding quickly, for your diligence and amazing work ethic.

  • Daniel Velichkov avatar

    Daniel Velichkov

    Massive shoutout for completely rewriting all payout strategy systems! Your work on wild multipliers is nothing short of brilliant — supporting multiple wilds, flexible aggregation methods, and clean configuration is a game-changer. Handling any number of wilds separated in any number of types with individual multipliers Smart Aggregation – Multiplicative, additive, max, or even custom logic he knew system is both powerful and easy to maintain The way you structured this makes it effortless to configure and opens up so many possibilities for future features. Outstanding engineering! Also, massive shoutout for building up the integrity of our team. Always speaking your mind freely contributes for acknowledging all problems without hesitations and creates a safe environment for everyone to speak up about their issues.

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Certificates

Resume

Education

  1. B.Sc. Software Engineering

    FMI, Sofia University | 2018 - 2022

    I built a strong foundation in systematic software design, development methodologies, and core programming principles. The program equipped me with the engineering discipline to develop robust, scalable, and efficient software systems.

  2. M.Sc. Business Administration

    UNWE, Sofia | 2011 - 2012

    I developed an advanced expertise in strategic analysis and leadership, building upon my undergraduate foundation to solve complex organizational challenges.

  3. B.Sc. Business Administration

    UNWE, Sofia | 2002 - 2007

    I developed a strong foundation in core business principles like finance, marketing, and strategic management. The program honed my analytical skills for data-driven decision-making and effective problem-solving in organizational contexts.

  4. High School of Mathematics and Computer Science

    Natural Sciences and Mathematics High School, Vratsa | 2007 - 2011

    I developed a strong analytical foundation in core mathematical principles and gained practical programming skills. This specialized curriculum has equipped me with a structured, logical approach to solving complex problems.

Experience

  1. Java-Quant Developer

    Flutter International | Apr 2023 - Present

    I architect and develop robust Java game servers, specializing in the creation, refinement, and tuning of complex game logic and mathematical models to ensure precise RTP and volatility. I own the full development lifecycle—from initial design and platform integration through test-driven refinement and CI/CD deployment—while collaborating cross-functionally to align all game elements. My work culminates in delivering fully validated game systems and detailed statistical documentation for production release.

  2. Game-Math Designer

    Evolution Engineering | Mar 2022 - Feb 2023

    I develop engaging gameplay by balancing complex probabilities and mechanics, while scripting automated tools and analyzing statistical data to solve development challenges. I collaborate cross-functionally to implement high-quality game features within a robust Slot Framework, adhering to strict code standards and agile methodologies throughout the entire lifecycle.

Projects for Companies

  1. Advanced Tile Proportion-Preserving Reel Sets Generator for Slot Machines

    Red Tiger | 2022
    • Engineered a flexible reel set generator that preserves exact tile proportions across all reels while supporting full configurability of shuffling logic, stack sizes, and payout-driven layout constraints.
    • Implemented weighted stack selection with configurable probabilities, allowing fine-tuned control over symbol distribution and frequency to match targeted RTP and volatility profiles.
    • Introduced minimum distance rules between identical tile types across different stacks, reducing clustering and creating more engaging player experiences.
    • Added adaptive shifting parameters and placement restrictions to tailor reel behavior according to specific game mechanics—such as stacked wilds, scatters, or multiplier symbols—enhancing both base game and bonus round performance.
    • Enabled support for all major payout strategies, including ways-to-win, cluster pays, and line-based systems, without compromising reel integrity or regulatory compliance.
    • Established a deterministic reel generation process that guarantees convergence to valid solutions for all major payout strategies, eliminating probabilistic failures and ensuring 100% successful generation.
    Java Maven RNG Probability Theory Statistical Analysis
  2. Advanced Bonus Purchase System for Online Slots & Ante Bet Multiplier System for Enhanced Gameplay

    Cayetano Gaming | 2024
    • Bonus Purchase System: Developed a deterministic bonus acquisition feature with configurable payout filtering and manifest-driven progressive bonus tracking, guaranteeing mathematical precision while enhancing player choice
    • Ante Bet Mechanics: Engineered bet multiplier systems that increase probability of triggering specific bonuses, creating tiered engagement models with precise RTP balancing
    • Mathematical Controls: Implemented statistical boundaries and interval-based filtering to achieve targeted mean values and player-expected outcomes
    • Regulatory Compliance: Designed systems with built-in validation and reporting to ensure adherence to international gaming standards and mathematical fairness
    • Player Experience: Created intuitive implementations that transparently communicate value propositions and probability improvements
    Java Spring Framework REST APIs Gradle Game Mathematics Statistical Modeling Algorithm Design Monte Carlo Methods

Side Projects

  1. Pathfinder

    Pathfinder - Interactive Route Sharing & Adventure Platform | 2022

    Pathfinder is a comprehensive full-stack web application designed for outdoor enthusiasts to share, discover, and review custom routes. The platform allows users to plan adventures—whether on foot, by bike, or by vehicle—by providing a complete toolset for mapping, documenting, and discussing journeys.

    • Secure user registration and profile management.
    • Role-based access control with a dedicated Administrator Panel. Administrators have enhanced privileges to manage all content, moderate user comments, and regulate the platform.
    • Create and upload detailed routes by specifying type (hiking, cycling, driving), difficulty level, and adding descriptions.
    • Visualize routes dynamically on an interactive map.
    • Attach photos in cloud to create visual journey logs and provide waypoint references.
    • Public comment and review system for each route, fostering community discussion.
    • Full administrative control to moderate discussions, ensuring a positive user environment.
    • The platform integrates with third-party REST APIs (such as weather forecast services) to provide users with relevant, real-time information that enhances route planning and safety.
    Java 17 Spring Boot MySQL Liquibase Docker Cloudinary Gradle Thymeleaf Validation Spring Security 6 DATA JPA
  2. MyMobile

    Full-Stack Car Classifieds Platform (Inspired by mobile.de / AutoScout24) | 2021

    Developed a full-featured web platform for buying and selling vehicles with:

    • Created a modern online marketplace for new & used vehicles with buyer and seller functionalities
    • Engineered robust user authentication & management system supporting registration, email verification, password recovery, re-captcha
    • Delivered advanced multi-parameter search with filtering, sorting, pagination — enabling users to efficiently find vehicles among thousands of listings
    • Implemented server-side sorting, pagination, and result highlighting with responsive grid/list views
    • Integrated currency converter service with live or cached exchange rates supporting BGN, USD, EUR and automatic price display in user's preferred currency
    • Built secure vehicle upload/ad creation feature with image gallery upload (multiple photos), form validation, temporary drafts, and admin moderation queue
    • Supported internationalization (multi-language UI, translations for filters/buttons/messages) using resource bundles or i18n libraries
    Java 17 Spring Boot MySQL Flyway Docker Cloudinary Gradle Thymeleaf Validation Prometheus Greenmail Spring Security 6 HSQLDB DATA JPA OAUTH2 Spring AOP Webflux Micrometer
  3. Blog Post

    Interactive Community Platform / Mini Social Network | 2023

    Developed a full-stack web application enabling user-generated content and interactions, similar to a simplified forum or social feed:

    • User registration, authentication, profiles, and role-based access
    • Create, edit, and delete personal posts with text, optional media
    • Comment section under each post with threaded replies, likes, and moderation
    • Integrated contact form for inquiries, feedback, and admin communication
    • Responsive design with clean UI/UX, secure data handling, and efficient querying
    Python 3.13 Flask Flask-Bootstrap Flask-CKEditor Flask-Gravatar Flask-SQLAlchemy Flask-WTF SQLAlchemy Jinja2 WTForms Flask-Login
  4. House Price Prediction

    Multivariable Linear Regression for Boston Housing Price Prediction | 2024

    This project uses the Boston Housing Dataset to build a multivariable regression model for predicting house prices based on various features like crime rate, number of rooms, property tax, etc.

    • Check dataset shape, feature descriptions (e.g., CRIM = crime rate, RM = rooms, LSTAT = socioeconomic status).
    • Inspect data structure, missing values, and basic statistics.
    • Plot histograms of target variable (MEDV = median house price) and key features.
    • Create scatter plots (MEDV vs. RM, LSTAT) to identify linear relationships.
    • Generate a correlation heatmap to quantify feature-target relationships and multicollinearity.
    Python 3.13 Jupyter Notebook Pandas Scikit-learn NumPy Matplotlib/Seaborn Linear Regression

My Skills

  • Data Structures and Algorithms
    95%
  • Mathematics and Statistics
    85%
  • Spring Framework and Java ecosystem
    90%
  • FastAPI and Python Ecosystem
    70%

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