</> Cosmin Marica

    Web2 / Product Engineering

    Backend-First Product Engineering for SaaS and Startup Teams

    I build maintainable web products with strong backend architecture, reliable APIs, robust auth and billing flows, and delivery habits that work in remote product teams.

    Web2 Skills

    Backend Architecture & APIs

    Node.js
    TypeScript
    Express
    REST API design
    PostgreSQL
    Prisma
    Redis

    Auth, Billing & Product Core

    JWT auth
    Role-based access control
    Session and permission modeling
    Stripe payments
    Webhook handling
    Audit-friendly data flows

    Full-Stack Delivery

    React
    TypeScript UI development
    Real-time systems with Socket.IO
    State management
    Testing workflows
    Cross-functional collaboration

    Infrastructure & Deployment

    Docker
    CI/CD foundations
    Nginx
    Environment management
    Observability-minded logging
    Production operations

    Selected Web2 Projects

    CosloAI

    Multi-channel AI product platform with booking, support, and commerce workflows across web and messaging channels.

    Node.js
    TypeScript
    React
    PostgreSQL
    Redis
    Docker

    Engineering focus

    • Designed backend services around modular APIs, auth, and role-based access.
    • Implemented Stripe-based billing and webhook-safe payment workflows.
    • Built maintainable deployment-ready services with strong separation of concerns.
    Code Live

    ArchVision

    Product-oriented full-stack platform for architecture workflows, focused on reliable data handling and maintainable delivery.

    React
    Node.js
    TypeScript
    PostgreSQL
    APIs

    Engineering focus

    • Structured backend modules for long-term product maintainability.
    • Implemented access-aware API flows for team-based operations.
    • Delivered features in iterative releases with remote stakeholder feedback loops.
    Code

    GamerChess

    Real-time multiplayer chess platform with matchmaking, persistent game state, and custom gameplay effects.

    React
    Node.js
    Socket.IO
    PostgreSQL
    Redis
    JWT

    Engineering focus

    • Built real-time game event flows with server-side validation and room permissions.
    • Modeled persistent matches and user progression with scalable state handling.
    • Balanced gameplay responsiveness with reliable backend consistency.
    Code

    CryptoShields

    Security-oriented product module set focused on auth, access control, and resilient API integrations for modern web apps.

    Node.js
    TypeScript
    Auth
    APIs
    Security

    Engineering focus

    • Implemented robust authentication and permission boundaries across services.
    • Hardened API interaction patterns around validation and operational reliability.
    • Prioritized predictable, maintainable backend behavior under production constraints.
    Code

    Professional Experience

    Backend-Focused Full-Stack Developer

    2022 - Present

    Delivering product-grade web applications for SaaS and startup teams, with strong focus on backend architecture, API reliability, auth, payments, and remote collaboration.

    How I Work

    01

    Start from product goals, then design backend-first architecture that scales with real usage.

    02

    Keep APIs explicit, version-aware, and easy for frontend teams to consume.

    03

    Treat auth, access control, and billing as core engineering surfaces, not afterthoughts.

    04

    Work async with clear updates, realistic estimates, and dependable handoffs.

    Need Product-Focused Engineering Support?

    I collaborate with software companies, SaaS teams, and startups that need strong backend execution with full-stack delivery discipline.

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