Senior Full Stack & AI Engineer

EDUARD BALAN

Senior Full Stack & AI Engineer

+40-751-**-**** Bucharest, Romania **************@*****.*** linkedin.com/in/eduard-balan-72799a427/ github.com/eduardbalan325/ eduardbalan325.github.io/portfolio/ PROFESSIONAL SUMMARY

TECHNICAL SKILLS

Frontend: React.js, Vue.js, Angular.js, Next.js, Redux, Zustand, React Query, Tailwind CSS, Material UI, HTML5, CSS3, SSR, SSG Backend: Node.js, Express.js, NestJS, FastAPI, Django, REST APIs, GraphQL, WebSockets, Socket.IO Databases: PostgreSQL, MongoDB, MySQL, Redis, Prisma, Drizzle ORM, Data Modeling, Query Optimization Cloud & DevOps: AWS, Azure, GCP, Docker, Kubernetes, Terraform, Infrastructure, GitHub Actions, GitLab CI/CD, Jenkins Architecture: Microservices, SaaS, Multi-Tenant Systems, Event-Driven Architecture, Serverless, System Design AI & LLM: OpenAI APIs, LLMs, RAG, LangChain, LangGraph, AI Agents, Vector Databases, Embeddings, Prompt Engineering APIs & Messaging: REST, GraphQL, Webhooks, RabbitMQ, Kafka, Third-party API Integrations Testing & Security: Jest, Vitest, Playwright, Cypress, Pytest, Unit/Integration Testing, OAuth 2.0, JWT, RBAC, OWASP Tools & Practices: Git, GitHub, GitLab, Postman, Swagger/OpenAPI, Jira, Agile/Scrum, Code Reviews, Performance Optimization, Mentoring PROFESSIONAL EXPERIENCE

Optima AI Senior Full Stack Engineer / AI Engineer Aug 2020 – Present Grand Est, France

• Architect and deliver scalable full-stack SaaS applications using TypeScript, React, Vue.js, Next.js, Node.js, Express.js, Python, and FastAPI.

• Build modern frontend architectures with React, Next.js App Router, TypeScript, Tailwind CSS, and Redux/Zustand, developing reusable components and high-performance user experiences.

• Design scalable backend platforms using Node.js, Express.js, NestJS, Fastify, Python (FastAPI, Django) implementing secure RESTful and GraphQL APIs.

• Develop robust data architectures with PostgreSQL, MongoDB, Redis, Prisma, and Drizzle ORM, optimizing schemas, indexing, caching, transactions, and high-volume queries.

• Design microservices and event-driven architectures using Docker, RabbitMQ, Kafka, asynchronous processing, and API-based service integration.

• Build AI/LLM-powered features using OpenAI APIs, LangChain, vector databases, RAG pipelines, prompt engineering, and intelligent automation.

• Deploy and maintain cloud-native applications on AWS and Azure using Kubernetes, Terraform, and Infrastructure automation, including EC2, ECS, Lambda, S3, CloudFront, and RDS.

• Containerize applications with Docker and Kubernetes, implementing scalable deployment architectures, health checks, logging, and service orchestration.

• Establish automated CI/CD pipelines using GitHub Actions and cloud deployment workflows with automated testing, code quality checks, container builds, and production releases.

• Improve performance through SSR, caching, Redis, database optimization, code splitting, lazy loading, API optimization, and frontend performance engineering.

• Mentor junior and mid-level developers through technical guidance, code reviews, troubleshooting, and knowledge sharing.

• Provide senior technical leadership through system design, architecture reviews, documentation, Agile collaboration, and cross-functional delivery. Senior Full-Stack Engineer with 10+ years of experience designing, developing, and delivering scalable SaaS, enterprise, and AI-powered applications for international clients. Expert in React.js, Next.js, TypeScript, Node.js, NestJS, Python, FastAPI, REST, and GraphQL, with strong end-to-end ownership across frontend, backend, APIs, and databases. Experienced in cloud-native and microservices architectures using PostgreSQL, MongoDB, Redis, AWS, Docker, Kubernetes, and CI/CD. Hands-on experience integrating LLMs, OpenAI APIs, RAG pipelines, vector databases, and AI-driven automation into production applications. Strong focus on system design, performance, secure API development, automated testing, scalable architecture, and production reliability. SDLC Corp Full Stack Engineer

Jan 2016 – Aug 2020 Coventry, United Kingdom

• Developed scalable full-stack web applications using React.js, Next.js, TypeScript, Node.js (Express.js) and Python (FastAPI/Django) for international clients.

• Developed high-performance Node.js, Python(FastAPI/Django) backend services and RESTful APIs using Express.js and NestJS with authentication, authorization, validation, and business logic.

• Designed and integrated REST and GraphQL APIs connecting applications with third-party platforms, payment providers, and external business systems.

• Implemented PostgreSQL, MongoDB, Redis, and Prisma solutions, optimizing queries, caching, schemas, and API response times.

• Built real-time features using WebSockets and Socket.IO for notifications, messaging, live dashboards, and collaborative workflows.

• Improved React performance through code splitting, lazy loading, memoization, SSR, API optimization, and reusable frontend patterns.

• Containerized Node.js applications with Docker and supported AWS deployments and CI/CD pipelines using GitHub Actions.

• Applied automated testing and quality practices using Jest, React Testing Library, API testing, code reviews, debugging, and performance profiling.

• Collaborated with senior engineers, designers, QA engineers, and project managers in Agile/Scrum teams and mentored junior developers. IT GOAT Software Developer

Oct 2014 – Mar 2016 Berkeley, Texas

• Developed and maintained internal web applications and services supporting university operations and student systems.

• Built frontend interfaces using React.js, Angular.js, HTML5, and CSS3 with a focus on usability and accessibility.

• Implemented backend services and APIs using Node.js, Express.js, and Python (FastAPI), integrating internal and third-party systems.

• Assisted with database development and data migrations using PostgreSQL, MySQL, and MongoDB.

• Automated administrative and operational tasks using Python and shell scripting.

• Collaborated with IT staff, designers, and stakeholders on reliable software solutions and production support.

• Participated in system maintenance, bug fixing, performance improvements, Linux systems, version control, and deployment workflows. Tyler Technologies Software Developer Intern

Aug 2012 – Sep 2014 Lubbock, TX, USA

• Contributed to software development projects using TypeScript, React, Node.js, and PostgreSQL.

• Built scalable REST APIs and backend services supporting business-critical applications.

• Worked on Node.js backend functionality and PostgreSQL application data.

• Collaborated with engineering teams in a fast-paced production software environment. EDUCATION

Bachelor of Science in Computer Science University of Texas at Austin Aug 2010 – Aug 2014 Lubbock, TX, USA LANGUAGES

English: Advanced / Fully Working Proficient (C1)

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