Alexander Cesar

Senior Frontend Engineer · self-employed · remote

Independent software studio for remote frontend work with European and U.S. teams, and the company through which I ship my own products. Client work (2025–2026): frontend delivery for OPTEN AG and Noevu GmbH, Switzerland — see the entries below. Own products: compounder, PromptNinja, Holter Log — see Products above.

Angular · React · React Native / Expo · TypeScript · Astro · Sanity · Hono · Cloudflare Workers · Supabase · Node

Senior Frontend Developer · contract · remote

Hired as the frontend specialist in the agency's team of designers and fullstack engineers: taking approved Figma designs to tested, accessible production code, building reusable components and contributing UX improvements. QA and technical direction on this engagement came from Noevu GmbH — see the next entry. Client names under NDA — anonymised case studies at alexcesar.com.

• National sports federation platform — Game Center with live standings, schedules and player statistics. Umbraco 17 / .NET 10 / HTMX. (2026)
• Voice-first B2B ordering app for a wholesale distributor — React Native / Expo, 60 fps audio recorder, upload queue with retry, DE/EN. (2025–2026)
• TV-production workflow tool for a national sports league — Angular, built against a frozen JSON contract so frontend and backend could ship in parallel. (2026)
• Enterprise customer portal — Angular 17; a 15-component library composed into 10+ portal sections. (2025)
• AI assistant interface — streaming chat for a distributor's staff. Angular 20 with Signals. (2025)
• Workplace safety heatmap for an industrial client — incident heat- and cluster-map. Angular 17. (2025)
• Manufacturer CMS platform — Umbraco 17 / Razor; editor-proof modules with content fallbacks. (2026)
• OPTEN Conventions Plugin — AI code review distributed across the agency's repositories: 5 review agents, 8 auto-loading skills, and a feedback loop that encodes senior developers' PR corrections as agent rules. compounder is its open-source successor.

Angular 17–20 (Signals) · TypeScript · React Native / Expo · Umbraco / .NET Razor · HTMX · SCSS · Figma

Senior Frontend Developer · contract · hybrid

Parallel engagement over the same period: Noevu provided QA and technical direction on my OPTEN delivery, alongside frontend and content-platform engineering for a Noevu client — an Astro site backed by a Sanity CMS: content schema and Studio setup, editor and preview workflow, and a design-token based styling system, built plan-first inside the team's own way of work.

Astro · Sanity · TypeScript · vanilla CSS with design tokens · Vercel

Senior Designer / UI Developer · full-time · remote

Design and frontend for energy and technology clients, in one role.

• Built reusable visual components across React, Angular and EmberJS, accelerating delivery and keeping consistency with the clients' design systems.
• Facilitated co-creation workshops with stakeholders, unblocking strategic decisions and aligning cross-functional expectations.
• Modelled user flows and navigation structures for responsive web systems; documented information architecture for complex digital products.
• Prototyped high-fidelity interfaces in Figma and Sketch, keeping to guidelines and visual consistency.
• Refactored code in critical projects; reviewed frontend code for quality — Atomic Design, BEM, unit and E2E tests.
• Applied usability and accessibility practice (heuristics, WCAG, WAI-ARIA); worked with engineers and QA on consistency between layout, code and accessibility.

React · Angular · EmberJS · TypeScript · SCSS · Figma · Sketch

UX Lead · full-time · remote

Led the UX/Research team of a legal-tech startup through discovery, development and launch of an immigration-planning MVP for Brazilians moving to Portugal — built, approved and tested in twelve weeks.

• Introduced Scrum for the UX/Research team, raising throughput and alignment with product development.
• Ran weekly workshops training the whole team on pixel-perfect wireframes, designs and clickable prototypes in Figma.
• Took deliverables from low to high fidelity and wrote the product Style Guide; tracked product metrics to support testing and pivots (product-led growth).
• People leadership: individual development plans, 1:1s and group feedback; remote, multidisciplinary squad across time zones.

Senior UI/UX Designer & Frontend Developer · full-time · remote

• Supported and developed UI for the educational portal — interviews, research and discovery with the clients available.
• Wireframes, designs and pixel-perfect clickable prototypes; frontend implementation with KnockoutJS (legacy) and Angular 9–11.
• Multidisciplinary agile team, local and remote.

Senior Frontend Developer · Bradesco Seguros

• Frontend maintenance and evolution of single-page applications (AngularJS, JSP) for Bradesco Seguros, in a high-security environment.
• Supported the migration and stabilisation of internal applications; implemented interfaces handed over by the Ebix design team.

Founder · Senior UX/UI Designer & Frontend Developer

Design studio: prototyping and development of web apps with React, Node.js and WordPress; art direction, visual identity and print; cloud deployment on DigitalOcean and Google Cloud.

• Brazilian Navy — SIGSAUDE: wrote the Navy's UX guidelines and redesigned the UX of the SIGSAUDE web application.
• Arena On: UX/UI and frontend for an online game-championship platform, for casual and professional players.
• WhatsApper: fundraising, UX/UI and frontend for a chatbot that creates and manages automated WhatsApp messages.
• WordPress online course: teaching people with no experience to build a professional website in under 24 hours.

Senior UX/UI Designer & Frontend Developer

Designed, prototyped and coded responsive interfaces for web applications, researched patterns and user behaviour, and helped raise the company's UX maturity — including the UX guideline used to develop web applications across the company.

• Fcorp Design — corporate design framework: a customised Bootstrap distribution with Bower, Grunt and Gulp tooling, adopted as the company standard.
• LOPE — unified people finder: replaced every people-locating tool with one application in three languages, for a ~400,000-strong workforce worldwide; built to W3C, WAI-ARIA and WCAG standards.
• Speaker, trainer and knowledge multiplier in internal seminars and workshops on design and frontend practice.

Flash Instructor (Macromedia / Adobe)

Taught Macromedia Flash MX 2004 and Adobe Flash 8: building rich internet applications in the Flash IDE — design and programming — and deconstructing effects from leading multimedia sites.

Freelance Designer & Frontend Developer

Paid exploration alongside every role above — the space to research and push past the day job's limits. Since 2025 the practice is where I build and ship my own software — the products at the top of this page.