denisrafailov.com

Experience

Leadership, architecture, and hands-on delivery across SaaS and product teams.

  1. 2 yrs 4 mos Wyoming, USA & Berlin · Remote

    Founder & Engineering Lead

    AITOC.io
    • Founded AITOC and lead architecture and delivery of custom software that connects people, processes, and data for growing businesses.
    • Design integrations and internal platforms that automate manual work, unify operations, and give leaders real-time visibility for decisions.
    • Ship AI-assisted process automation and bespoke tooling from discovery through production — stack selection, APIs, workflows, and observability.
    • Own end-to-end technical direction for client engagements: requirements, system design, implementation, and handoff to operations teams.
    TypeScript Python LangChain Integrations
  2. 1 yr 6 mos London · Remote

    Co-Founder & CTO

    Youbee.io
    • Led all technical decisions for an AI-driven mental health platform focused on early detection via machine learning.
    • Directed infrastructure and architecture for scalable models with strong data security and ethical constraints.
    • Guided internal and external engineers on algorithms and data pipelines; advanced the platform through pilot readiness.
    TensorFlow Keras Python ML pipelines
  3. 2 yrs 3 mos New York · Remote

    Senior Software Engineer

    Ideonapi.com
    • Built a high-availability SaaS API for health insurance — automating extraction and unifying datasets from multiple providers.
    • Delivered automation in Rust and Ruby on Rails; improved API efficiency and achieved 18% higher data ingestion.
    • Led Heroku-to-AWS migration with a focus on cost, performance, and reliability; owned logging, monitoring, and alerting practices.
    Rust Ruby on Rails React AWS TDD
  4. 2 yrs Berlin

    Full-Stack Software Engineer

    METRO.digital
    • Contributed to a multi-country, high-availability e-commerce platform on PHP / Spryker with GCP, Docker, and Kubernetes.
    • Established CI/CD with GitLab, Jenkins, and GitHub Actions; promoted clean code, TDD, and team learning through Coding Dojos.
    PHP Spryker GCP Kubernetes
  5. 6 mos Berlin

    Senior Software Engineer

    Tandem

    API for language learning (text, audio, video). Introduced unit and E2E tests — 35% code coverage gain.

  6. 3 yrs 2 mos Sofia

    Full-Stack Software Engineer

    Ascent

    E-commerce, trading, and fitness apps with high test coverage; lectures on SOLID, PSR, and Event Sourcing.

    AWS Event Sourcing CQRS
  7. 6 mos Sofia

    Lead Software Engineer

    Prospective Web

    Backend team lead — REST APIs (Lumen/Laravel), architecture patterns, mentoring on clean code.

  8. 1 yr 9 mos Sofia

    Full-Stack Developer

    BulIns

    Insurance claims automation — 120% performance improvement on core processing flows.

Stack & practices

What I reach for when designing systems and leading delivery.

Programming languages

  • TypeScript
  • Ruby
  • Rust
  • Python
  • PHP
  • JavaScript
  • C#
  • R

Frameworks & libraries

  • Rails
  • React
  • Redux
  • Laravel
  • Symfony
  • Spryker
  • Express
  • Angular
  • LangChain
  • TensorFlow
  • Keras
  • .NET

Cloud & infrastructure

  • AWS
  • EC2
  • Lambda
  • SQS
  • EventBridge
  • CloudFront
  • ElastiCache
  • GCP
  • Docker
  • Kubernetes
  • Heroku
  • ElasticSearch
  • Algolia

Delivery & tooling

  • GitLab CI
  • Jenkins
  • GitHub Actions
  • CodePipeline
  • IaC
  • Agile
  • Scrum
  • Kanban

Architecture & engineering practices

  • TDD
  • DDD
  • SOLID
  • CQRS
  • Event Sourcing
  • OOP
  • MVC
  • PSR
  • Mentoring
  • Code review

Education

  • Practical Software Engineering Software University, Sofia · 2014–2016 · GPA 5.0/6.0
  • Bachelor of Informatics Varna Free University · 2012–2016 · GPA 5.22/6.0

Let's build something reliable.

Looking for a technical leader who still ships — architecture, teams, and code in production.

hi@denisrafailov.com