Technical Lead & Full Stack Engineer

I architect and build scalable AI-powered platforms processing thousands of daily events for enterprise clients. From leading microservices design to optimizing infrastructure costs, I transform complex business requirements into reliable, production-ready solutions.

Portrait of Arsen Hrynevych

RECENT PROJECTS

AI Chatbot Support Agent with document retrieval capabilities

AI CHATBOT SUPPORT AGENT

I developed an AI-powered support chatbot capable of retrieving and understanding company documentation using Qdrant for vector search. The solution provides real-time responses based on the latest documentation updates, enhancing both customer and internal support efficiency.

Key achievements include:

  • Designed and implemented a document retrieval system with vector-based search capabilities
  • Integrated multiple AI models (Groq, Gemini, OpenAI) to optimize response accuracy and context understanding
  • Built a high-performance backend using FastAPI with seamless AI service integration
  • Implemented voice response capabilities using OpenAI Whisper and ElevenLabs for natural interactions
  • Deployed on GCP Cloud Run for scalable, cost-efficient hosting with optimal performance

Technologies used: Groq • OpenAI Whisper • ElevenLabs • Gemini • GCP Cloud Run • Next.js • Firebase • TypeScript • LangFlow • Qdrant • FastAPI

Review Automation Service for Google Places

REVIEW AUTOMATION SERVICE

I developed a sophisticated system for automating responses to reviews on Google Places. The solution analyzes each review's language and contextual content to generate appropriate, personalized responses, streamlining business communication with customers.

Key achievements include:

  • Built robust backend services using FastAPI and client interfaces with Next.js
  • Created intelligent routing mechanisms for language detection and optimal model selection
  • Implemented LangGraph-powered verification agents to ensure response accuracy and relevance
  • Designed a vector database system with Qdrant for context-aware response generation
  • Integrated OAuth2.0 authentication for secure access to Google Places API

Technologies used: FastAPI • Next.js • PostgreSQL • Qdrant Vector Database • LangChain • Pydantic AI • ChatGPT • GCP API & Services • OAuth2.0 • DeepSeek v3

Voice Real-Time Translation prototype

VOICE REAL-TIME TRANSLATION

I developed a prototype for real-time voice translation designed for eventual deployment on mobile devices. This project focused on creating efficient communication solutions by leveraging cutting-edge AI translation models and speech recognition technologies.

Key achievements include:

  • Researched and implemented solutions for low-latency real-time voice communication
  • Conducted comprehensive evaluations of various AI tools and their multi-language capabilities
  • Explored on-device translation methods to reduce cloud platform dependencies
  • Integrated advanced speech recognition with OpenAI Whisper and Deepgram technologies
  • Optimized translation workflows to minimize delays in communication

Technologies used: Python • LiveKit • Whisper • OpenAI API • DeepSeek v3 • Deepgram

Custom ChatGPT for EdTech platform support

CUSTOM CHATGPT FOR EDTECH SUPPORT

I developed a specialized ChatGPT implementation to streamline support processes for an EdTech platform. By creating domain-specific documentation and precisely configuring the model, I built an AI assistant that accurately retrieves and delivers platform-specific information.

Key achievements include:

  • Reduced support workload by automating responses to common platform inquiries
  • Improved new user and client onboarding efficiency by 30-40%
  • Created comprehensive domain-specific documentation for training the AI model
  • Optimized model configuration for accurate information retrieval and contextual responses
  • Implemented a user-friendly interface that increased self-service support adoption

Technologies used: OpenAI API • Vector Databases • Natural Language Processing • Knowledge Base Management • API Integration

Stripe payment integration for OpenedX platform

ECOMMERCE STRIPE PAYMENT INTEGRATION

I conducted an extensive investigation and successfully resolved critical issues in the Stripe payment integration for the OpenedX platform. This project involved a deep dive into the Stripe payment flow, changing the payment interface.

Key achievements include:

  • Conducted thorough analysis and optimization of the Stripe payment flow for enhanced efficiency
  • Redesigned and improved the payment interface for better user experience and conversion rates
  • Implemented advanced Stripe security measures to ensure compliance with European standards (GDPR, PSD2)
  • Refactored payment services to incorporate industry-leading security practices and reduce vulnerabilities

Technologies used: Redux • JavaScript • React • Django • Redis • AWS • Celery

ESUPPORT

ESUPPORT is a sophisticated B2B lead generation solution that leverages the LinkedIn platform to build valuable business connections. The platform offers customized strategies and automated tools that enable businesses to engage effectively with potential clients. Our solution streamlines communication processes and campaign management, facilitating sustainable business growth through strategic B2B networking.

Key achievements include:

  • Increased client outreach efficiency by 35% through optimized LinkedIn workflows.
  • Designed and implemented automated messaging sequences to improve conversion rates.
  • Integrated advanced analytics for campaign performance tracking and decision-making.

Technologies used: React • Django • FastAPI • Redis • MySQL • Bootstrap 4 • Azure

JOBSEEKER

JobSeeker is an innovative AI-powered CRM system that bridges the gap between talent and organizations. The platform streamlines the recruitment process by automatically generating tailored resumes from candidate submissions based on specific job requirements. Companies can efficiently review applications and schedule interviews through our intuitive interface, making the hiring process more efficient and effective.

  • Developed an intelligent resume parsing and generation system tailored to job requirements.
  • Designed an intuitive dashboard for recruiters to track, review, and schedule interviews effortlessly.
  • Integrated robust AI models for skill matching, resulting in a 30% improvement in candidate-employer alignment.
  • Implemented Docker-based deployment pipelines for seamless scalability and management.

Technologies used: FastAPI • React • Redux • PostgreSQL • Docker • Azure

Moving Valencia

Moving Valencia is a lightweight and cost-effective website designed as a digital business card. It offers essential information and contact details with a focus on simplicity and efficiency.

Key achievements:

  • Developed using only CSS and HTML, ensuring lightning-fast load times.
  • Completed the entire build process in a remarkably short timeframe.
  • Achieved a highly affordable development process while maintaining quality.

Technologies used: • CSS • HTML • JS • Parcel

SLACK DESKTOP DISPATCHER

An asynchronous Slack bot designed to efficiently manage desktop resource allocation within organizations. This sophisticated solution handles user requests for selecting, releasing, changing, and canceling desktop assignments in real-time. The bot maintains system-wide transparency by automatically notifying all users about desktop availability and occupancy status, ensuring optimal resource utilization.

Key Achievements

  • Developed a fully asynchronous bot ensuring real-time performance even under heavy load.
  • Implemented robust notification logic to maintain transparent communication across the organization.
  • Utilized advanced database handling with SQLAlchemy and Alembic for seamless desktop resource tracking.
  • Deployed using Kubernetes, ensuring scalability and ease of maintenance.

Technologies used: SlackAPI • SQLAlchemy • Docker • Alembic • PostgreSQL • Async Python


Experience

Technical Lead

July 2025 — Present

manifōld AI

Copenhagen, Capital Region of Denmark · Remote

  • Own product vision and architectural design of the platform: define technology stack, drive key decisions on system design, security, and compliance.

  • Lead the creation and implementation of new services and microservice architecture, ensuring scalability, fault-tolerance, and enterprise-grade reliability.

  • Lead the evolution of the AI agents platform processing 2000+ events daily for enterprise clients with low-latency and high availability.

  • Deliver secure and compliant solutions, including high-compliance projects, third-party integrations, and data processing optimizations.

  • Partner with clients to transform business requirements into scalable technical solutions, bridging product and engineering.

  • Developed a new AI agent service for automated message processing that reduced agent development time from months to weeks, significantly accelerating time-to-client and improving delivery efficiency.

Technologies: Node.js • BullMQ • Pydantic AI • LangGraph • MCP • A2A • Python • Auth0 • FastAPI • React.js • Next.js • Azure • GCP • Redis • PostgreSQL • Qdrant

Backend Infrastructure Developer

March 2025 — July 2025

manifōld AI

Denmark · Hybrid

  • Designed and implemented a developer onboarding process, improving integration of new hires and accelerating team productivity.

  • Established CI/CD pipelines with automated security checks, enhancing code quality and enabling early detection of vulnerabilities.

  • Modernized legacy services step by step, delivering scalable architectures and improved customer UI/UX.

  • Optimized deployments, achieving annual infrastructure cost savings of €8,000+ through process redesign and resource-efficient tooling.

  • Built and maintained production-ready AI integrations (MCP, A2A), enabling reliable interactions with AI agents and boosting investor confidence.

Technologies: Node.js • BullMQ • Pydantic AI • LangGraph • MCP • A2A • Python • Auth0 • FastAPI • React.js • Next.js • Azure • GCP • Redis • PostgreSQL • Qdrant

Full Stack Developer

April 2024 — Present

Raccoon Gang

  • Led the development and deployment of a legacy tool, streamlining platform updates from legacy code to new standards, eliminating over 50 duplicated packages and numerous errors to enhance system efficiency.

  • Authored comprehensive documentation and mentored the team, ensuring smooth adoption of the new tool and empowering team members to manage complex updates while maintaining high standards.

  • Supported and enhanced LMS platforms for scalability and user experience. Conducted unit testing with over 90% code coverage, significantly boosting system reliability and user satisfaction.

  • Spearheaded improvements to the onboarding process and established a practice of regular knowledge sharing to foster team growth and skill enhancement.

Technologies: Python • Django • DRF • React.js • Docker • AWS • Micro Frontend • Airtable • React Query • MySQL • MongoDB • Memcached • Elasticsearch • Celery • Redis • PostgreSQL

Full Stack Developer

May 2023 — April 2024

IT-Sprout

  • Developed and deployed a secure microservices architecture, achieving a 40% reduction in unauthorized access attempts and exceeding company benchmarks.

  • Authored 70% of the codebase for a critical CRM system using ReactJS, FastAPI, and PostgreSQL, which streamlined team operations during a period of high demand.

  • Trained and mentored 4 interns, enhancing team skills and facilitating knowledge transfer, which led to a 50% faster project delivery rate and improved code quality.

  • Executed a cost-saving initiative by implementing a serverless approach on AWS, reducing production costs by 20% and improving scalability. Optimized cloud infrastructure, resulting in $1,500 in monthly savings.

Technologies: React.js • FastAPI • PostgreSQL • Python • AWS • Docker • Microservices • Redis


Technical Stack

Backend Development

  • Python • Django • DRF • FastAPI
  • Node.js • Microservices Architecture
  • RESTful API • GraphQL
  • Celery • BullMQ • Redis

Frontend Development

  • React.js • Next.js • TypeScript
  • Redux • React Query • Micro Frontend
  • Tailwind CSS • SASS • Responsive Design
  • ES6+ • Modern JavaScript

Databases & Caching

  • PostgreSQL • MySQL • MongoDB
  • Redis • Memcached
  • Qdrant • Elasticsearch
  • Airtable • Vector Databases

AI & Machine Learning

  • Pydantic AI • LangGraph • LangChain
  • MCP • A2A • AI Agents
  • OpenAI • ChatGPT • DeepSeek
  • Vector Search • RAG Systems

DevOps & Cloud

  • AWS • Azure • GCP
  • Docker • Kubernetes • CI/CD
  • GitHub Actions • GitLab CI • Jenkins
  • Infrastructure Optimization

Other Skills

  • Auth0 • OAuth2.0 • Security
  • Unit Testing • E2E Testing • TDD
  • Git • GitHub • GitLab
  • Scrum • Kanban • Agile

Learning

Recent

  • Test-Driven Development with Python

    Book, 2024

  • Designing Data-Intensive Applications

    Book, 2024

  • AWS Certified Cloud Practitioner

    AWS 2024

Current Focus

  • Architecting AI agent systems with advanced orchestration patterns
  • Building high-performance services with Rust
  • Designing systems for 10M+ concurrent users
  • Advancing enterprise-grade security and compliance solutions

Let's Connect

Open to discussing technical leadership opportunities, architectural challenges, or innovative AI-powered solutions. Let's explore how we can build something impactful together.