Andrei Krestyan

Product Architect

Technical Leader Driving Full-Lifecycle Product Architecture and Delivery.

Email Marketing · Robotics · Conversational AI · Mobile

Senior technical owner, trusted to merge architecture authority with hands-on execution across backend, frontend, DevOps, embedded, automation, and design systems.

Contact

a.krestyan@gmail.com

Available for contracting, fractional, or venture build roles.

Skills & Stack

Full-spectrum leadership across product, engineering, and ops.

Leadership & Product

  • Team management & hiring
  • Product discovery & UX research
  • System & domain architecture
  • Requirements & roadmap ownership

Backend & Platforms

  • Flask · FastAPI · NodeJS
  • SQL, Redis, RabbitMQ
  • Service decomposition & APIs
  • Performance & observability

Frontend & Experience

  • React · React Native
  • Design systems · Figma
  • UX flows · accessibility
  • Client-side state & routing

DevOps & Infrastructure

  • Docker · containers
  • AWS · GCP · DigitalOcean
  • CI/CD: GitHub Actions, Jenkins
  • Observability: Grafana, Elastic

Automation & QA

  • n8n workflows
  • Pytest · Locust · E2E suites
  • Release management
  • Cost/perf monitoring

Embedded & Robotics

  • C/C++ · Arduino · Raspberry Pi
  • Linux kernel customization
  • Sensor & actuator integration
  • Edge-to-cloud connectivity

Selected Projects

Hands-on ownership from concept to production.

300Digital

CTO · Email Marketing

Lifecycle email marketing platform

FastAPIPytestReactJSNginxDockerSQLDigitalOceanAWSGrafanaCloudflareRedisLocustRabbitMQGitHub Actionsn8n

Built a full-scale email marketing platform handling multi-tenant list management, remote ESP integrations, campaign orchestration, and performance analytics.

  • Designed and implemented the core architecture for list ingestion, synchronization, and segmentation across external ESPs.
  • Built campaign creation, scheduling, and sending flows with strict delivery, throughput, and reliability requirements.
  • Delivered the analytics pipeline for tracking engagement, conversions, and system-wide performance signals.
  • Owned backend, frontend, DevOps, testing, and operational automation to keep the platform stable under growth.

Lean Automations

CTO · Robotics & IoT

Automated robotics and connected device platform

FlaskC/C++ReactDockerLinuxArduinoRaspberry PiAWSElasticStack

Delivered embedded-to-cloud automation systems combining firmware, edge compute, hardware integration, and remote orchestration.

  • Engineered end-to-end stacks across microcontroller firmware, Raspberry Pi services, cloud APIs, and operator UIs.
  • Integrated sensors, actuators, and physical security hardware into reliable production workflows.
  • Built remotely deployable automation systems powering fully automated machines with continuous telemetry and OTA updates.

Medstoria

Contractor · Mobile

Event ticketing marketplace

ReactJSDockerGitAWSJenkins

Delivered a mobile-first React experience for med event discovery and ticketing.

  • Defined product flows and visual language for the customer journey.
  • Built CI/CD with Jenkins + Docker to ship weekly mobile web releases.
  • Implemented secure CI pipelines and oversaw DevOps automation for staging/production parity.

UBIK

CTO · Conversational Platforms

Enterprise chatbot platform

FlaskReactDockerSQLGCPGit

Built a multi-tenant chatbot platform for enterprises, spanning customer-facing and internal automation use cases across web and messaging channels.

  • Owned end-to-end architecture for a scalable, multi-tenant chatbot backend with secure tenant isolation.
  • Designed conversation, routing, and integration layers to plug into existing CRMs, marketing tools, and internal systems.
  • Led cross-functional team covering product, UX, and full-stack engineering for several concurrent enterprise deployments.