Alexander Cesar

Design Engineer

Designer and front-end engineer with nearly thirty years keeping design and code in the same hands. I take approved designs to tested, accessible production frontend, and build full products on my own. Currently contracting for OPTEN AG in Switzerland and shipping AI-native products with agent teams.

Selected work

Independently — products built end to end

Holter LogPWA · Supabase · Vercel · live

A clinical diary for the 24-hour Holter exam — the patient taps a symptom and it lands timestamped on the doctor's dashboard. Designed and built solo.

EcoDriveReact Native · Expo · Claude

Snap a fuel pump and Claude Vision reads liters, price and total — no typing.

PromptNinjaHono · Cloudflare · D1 · Stripe

A SaaS that turns rough notes into structured prompts.

Through OPTEN AG — engineering inside a Swiss team

National sports platform.NET 10 · Umbraco · HTMX · SignalR

Game Center, standings, player statistics and club finder — approved Figma to tested, accessible frontend. National sports federation

Voice-first wholesale orderingReact Native · ASP.NET Core · Azure OpenAI

Speak an order and it becomes matched catalog line items, across iOS, Android and web. Wholesale distributor

TV-production workflow toolAngular · ASP.NET · TypeScript

Dashboard, match details and the JSON data contract that guided the backend API. National sports league

Experience

AXIA Digital — own practice

2025 — now

Design Engineer · OPTEN AG contractor (Switzerland)

Take features from approved Figma designs to merged, tested, accessible frontend across Swiss client products — design decisions and production code in the same hands, with AI agents shipping alongside me.

.NET · Umbraco · Angular · React Native · HTMX · SCSS · Azure OpenAI

CESAR

2022 — 2025

Senior Designer / Frontend Engineer

Built reusable component systems across React, Angular and EmberJS for energy and tech companies, with accessibility and atomic design throughout — design and code in the same hands.

React · Angular · EmberJS · TypeScript · Design systems · WCAG

Eleva Educação

2020 — 2021

UX/UI · Front-end (Angular)

Ran the discovery and redesigned Canal Eleva for 120k+ students through the lockdown, as designer and front-end developer.

Design Acessível — own studio

2014 — 2018

Founder · accessibility-first

Accessibility-first studio. Authored UX guidelines and built the SIGSAUDE app for the Brazilian Navy, Arena On (e-sports platform) and WhatsApper (a WhatsApp chatbot).

Petrobras

2006 — 2015

UX Methodology · Design Framework

Nine years shaping how Petrobras builds software. Authored company-wide UX guidelines and created Fcorp Design — the corporate design framework adopted across Petrobras applications. LOPE, the company-wide people locator, came out of this era.

Rich-media & Flash era

2002 — 2009

Be! Interactive · USGI · Shoptime · Infnet

Visual programmer and Flash instructor — award-winning rich-media interfaces for Nike, CBF, HSBC, Oi and others, and teaching rich-application design and programming at Infnet.