Tomás Sitta
Tomás Sitta

UX/UI Designer & Full-Stack Developer

Open to offers · Member since 22 Oct 2026
Location
Buenos Aires, Argentina
Desired salary
Unspecified
Work preference
Remote Only / Full Time, Freelance
Experience level
Mid

About

Professional summary

I am a full-stack designer and developer focused on creating digital products from initial research and UX/UI design through frontend, backend, deployment, and AI integration.

I have built and launched production platforms independently, including a multi-platform astrology application, a wine-industry ERP and ecommerce system, and a logistics automation toolkit.

I combine product thinking, visual design, and engineering to create intuitive interfaces, scalable workflows, and reliable integrations. My design process includes research, wireframes, prototypes, design systems, and polished UI delivery.

On the technical side, I work with React, React Native, Python, Flask, Firebase, SQL, Docker, and cloud deployment tools. I also build payment, email, reporting, and third-party API integrations.

I have practical experience implementing LLM-powered conversational agents using Gemini and Anthropic APIs, including function calling and multi-step operational workflows.

I am a native Spanish speaker with advanced professional English and intermediate French. I am open to opportunities where I can contribute across product design and full-stack development.

Skills

25 capabilities

Tech stack & tools

Working toolkit

Application Hosting

Assets and Media

Design

Experience

Career history

Freelance UX/UI Designer & Developer Independent

I deliver end-to-end design and development services for local and international clients, covering research, wireframes, UX/UI design, frontend and backend implementation, and deployment.

I use Figma for interface design and combine product design skills with full-stack engineering to deliver complete digital products.

Full-Stack Designer & Developer Appstral

I designed and built a full-stack astrology application for web, iOS, and Android using a proprietary Python ephemeris engine based on Swiss Ephemeris. I created the interactive zodiac wheel, custom SVG iconography, dark mode, bilingual Spanish/English experience, and shareable card generator.

I implemented Stella, a conversational AI agent using Gemini API function calling to calculate real-time astrological positions. The product achieved 319 organic users across 33 countries, approximately 4.1% premium conversion, and approximately 31% DAU/MAU without marketing spend.

Full-Stack Designer & Developer Druida + Finca Los Astros

I am responsible for the complete production stack for a boutique winery, including an ERP and ecommerce system supporting two wine brands. I built the online store with MercadoPago and PayPal checkout, event and tasting reservations, deposits, member accounts, capacity-based waiting lists, and transactional emails.

I developed the internal ERP for viticulture, vinification, bottling, labeling, purchasing, supplier management, stock management, and user-level change auditing. I also implemented an internal Gemini-powered agent that answers operational questions through up to five chained tool calls.

Full-Stack Developer Bronzen-app

I developed an AI automation toolkit for warehouse logistics used daily by 10 to 20 employees, including a native Android application built with Capacitor.

I created a WhatsApp notification module using Meta Graph API with phone normalization, fuzzy matching, a three-step review workflow, and delivery-status validation. I also implemented authentication and role-based data visibility for client, salesperson, and administrator profiles.

Tax Operations Analyst PwC – Acceleration Center

I supported tax operations for US clients in a Big Four corporate environment, handling high-volume data and operational processes under pressure.

The role strengthened my professional English communication, attention to detail, and ability to work accurately within structured, deadline-driven workflows.

Education

Learning history

FADU, Universidad de Buenos Aires

Graphic Design, Graphic Design

Graphic Design program in progress.

UTN

FullStack Web Development Program, Full-Stack Web Development

Completed FullStack Web Development Program.

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