Богдан

BOHDAN HAVRYLIUK
Full Stack AI Engineer • AI Automation • Backend • LLM Systems
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | github.com/bogdan734

PROFILE
Full Stack AI Engineer with 5+ years of software engineering experience and 4+ years of hands-on AI
development, model evaluation, and AI-enabled product delivery. Experienced in building end-to-end systems
across async Python, .NET, LLM integrations, backend APIs, databases, cloud deployment, and voice AI. Built
and support production automation used by real recruiters and candidates.

KEY SKILLS
Languages: Python, C#, C++, C, JavaScript, PHP, Lua, SQL, HTML/CSS
AI / LLM: Claude API, LLM tool use, prompt engineering, AI response evaluation, RLHF / AI training pipelines,
NLP, computer vision, voice AI
Backend & Infrastructure: FastAPI, asyncio, SQLAlchemy 2, Alembic, Pydantic, .NET / ASP.NET, Node.js,
PostgreSQL, SQLite, Redis, Docker, Docker Compose, Caddy, VPS
Integrations: Vapi, Deepgram, ElevenLabs, SIP, Telegram MTProto / Telethon, KeyCRM REST, webhooks,
REST APIs, S3-compatible storage
Languages Spoken: English (fluent), Ukrainian (native), Russian (native)

EXPERIENCE
AI Training Contractor — Scale AI | Jan 2026 – Jul 2026 (Freelance, Remote)
• Evaluated AI-generated code and technical responses for correctness, helpfulness, safety, and best
practices.
• Performed side-by-side comparisons across coding, algorithm analysis, and problem-solving tasks.
• Assessed time/space complexity, programming principles, and security considerations in AI outputs.
• Solved advanced Python coding exercises to validate AI capabilities and identify failure modes.
• Flagged harmful or policy-violating responses to support model quality and safety improvements.
AI Trainer — Meta | Jan 2025 – Feb 2026 (Contract, Hybrid)
• Contributed to training and fine-tuning large-scale AI models through structured data generation and
feedback.
• Reviewed and rated model outputs across technical and general domains to improve response quality.
• Applied software development and AI expertise to assess accuracy, usefulness, and clarity of model content.
Team Lead & Software Developer | Sep 2023 – 2025 (2 Years)
• Led project teams to deliver complex software and AI solutions on time and within scope.
• Coordinated task distribution and streamlined collaboration workflows across team members.
• Architected and built backend and full-stack applications using C#, .NET, Python, and SQL.
• Enforced code-quality standards and drove continuous performance optimisation.
Freelance Full Stack AI Engineer | 2021 – Present (5+ Years)
• Designed and delivered full-stack, backend, and AI automation solutions for private clients, from requirements
and UX through development, delivery, and support.
• Built scalable business logic, integrated relational databases, and maintained high code standards across
diverse technology stacks.
• Delivered several non-disclosable professional projects under NDA.
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PRODUCTION PROJECTS
AI Voice Recruiter "EVA" — End-to-End Hiring Automation (Python, FastAPI, Claude API, Vapi,
PostgreSQL)
• Sole developer of a production system for Kozyr Trans that autonomously calls candidates in Ukrainian, runs
structured screening, and routes qualified candidates to recruiters; processed 300+ live calls.
• Integrated KeyCRM end to end: candidate cards are created and moved through the funnel automatically with
transcript, call recording, AI summary, and structured screening fields.
• Built a Telegram MTProto follow-up agent for unreachable candidates, merging voice and chat dialogs into
the same CRM card with deduplication.
• Implemented async services with FastAPI, SQLAlchemy 2, Alembic, PostgreSQL, Claude API, Vapi,
Deepgram, ElevenLabs, SIP, webhooks, Docker Compose, Caddy, and APScheduler.
• Added resilience features including SIP diagnostics, voicemail detection, concurrency/per-person call caps,
and self-healing reconciliation of unfinalized calls and missed events.

SELECTED FULL-STACK PROJECTS
Personal Blueprint — AI Numerology Report SaaS (Python, FastAPI, Claude, Jinja2, SMTP)
• Built a full-stack solo SaaS flow from landing page and checkout through deterministic date-of-birth
calculations, Claude-generated personalized reports, branded HTML/PDF rendering, and email delivery.
• Implemented signature-verified payment webhooks, a 208-block knowledge base, prompt guardrails and
linting, an optional PDF pipeline, and 34 offline pytest tests.
dZENcode Comments SPA (Django, DRF, Channels, Celery, RabbitMQ, PostgreSQL, Redis, Elasticsearch,
Vue 3)
• Built a Dockerized cascading-comments SPA with unlimited reply depth, CAPTCHA, attachments, JWT auth,
real-time WebSocket updates, live preview, validation, and XSS/SQLi protections.
• Designed scale-ready backend features: GraphQL, async search indexing, idempotency middleware, rate
limiting, S3/CDN attachment support, Prometheus metrics, read-replica routing, partitioning template, and
Locust load tests.

UNIVERSITY PROJECTS
AI Conversational Chatbot (Python, NLP, REST API)
• Built a context-aware chatbot with NLP preprocessing, intent recognition, entity extraction, and a REST API
layer for external applications.
Rice Variety Classification via Transfer Learning (MATLAB, AlexNet / GoogLeNet)
• Applied transfer learning, data augmentation, stratified splits, SGDM fine-tuning, and accuracy/confusion-
matrix evaluation.
Neural Network — Horseshoe Curve Length Prediction (MATLAB)
• Developed a custom neural network from scratch for geometric prediction using numerical optimisation.
Other Projects: Car Rental System (C#, .NET) | School Library Database (SQL) | Retail Management Network
Simulation (Cisco)

EDUCATION
BSc (Hons) Artificial Intelligence — De Montfort University, Leicester | 2023 – Present
• Core modules: Machine Learning, Neural Networks, Computer Vision, Intelligent Systems, Data Structures &
Algorithms, Software Engineering.
• Current Average: First Class Honours (71.7%).
Secondary School — Lyceum No. 293, Kyiv, Ukraine | Graduated 2023
• Mathematics profile with focus on advanced mathematics, physics, and computer science.

COURSES & CERTIFICATIONS
C++ Programming — IT Step Academy, Kyiv | 2021 – 2022
Robotics Programming — Mala Akademiya Nauk (MAN), Kyiv | 2021 – 2022