Leonardo Miranda
@leonardomiranda
Senior frontend engineer shaping React architecture and shipping weekly to 300k+ users.
BrazilWhat I'm looking for
I’m a Frontend engineer with 8+ years of experience—six in React—and I’ve held a Senior title for the last several. I’m at my best in early-stage work where the frontend architecture is still being decided, and I can make the call and own it.
I’ve built component libraries and testing harnesses that other teams shipped on, breaking large problems into increments that ship weekly. I care about doing things the right way without letting that become an excuse not to ship.
In recent roles, I’ve driven frontend architecture across squads, rebuilt customer experiences on top of a Rails monolith using feature-flagged increments, and established micro-frontend boundaries so squads could ship independently. I also owned a React Native app rated 4.8 on both stores.
I’ve consistently focused on quality and measurable outcomes—adding Cypress to the pipeline, pairing observability (New Relic, Grafana) with A/B testing, and improving conversion and delivery performance. I also ship LLM APIs into products and keep refining how teams build, test, and release frontend systems.
Experience
Work history, roles, and key accomplishments
Staff Engineer
Fit Energia (Grupo Santander)
Jun 2025 - Present (1 year 1 month)
Drove frontend architecture across squads and rebuilt the customer account area in React with Redux on top of a Rails monolith. Migrated in increments behind feature flags and established micro-frontend boundaries to enable independent squad shipping.
Founder & Principal Engineer
Mevi
Jan 2025 - Present (1 year 6 months)
Bootstrapped and runs a SaaS end to end, owning frontend architecture and making product calls. Developed with TypeScript throughout and shipped LLM APIs into the product.
Senior Frontend Engineer
Forlex
Dec 2024 - May 2025 (5 months)
Helped set patterns for an early-stage frontend in Vue 3 and Nuxt 3 with TypeScript. Built a GraphQL BFF in Node to reduce API latency.
Senior Frontend Engineer
O Novo Mercado
Feb 2022 - Nov 2024 (2 years 9 months)
Owned the marketplace and eCommerce frontend in React with Redux and SCSS, serving 300k+ monthly active users across catalog, checkout, seller, and payment flows. Built a shared component library with a full testing harness and improved delivery with agile/test-first practices.
Research Engineer
UFMG (Dashbit Partnership)
Feb 2022 - Feb 2023 (1 year)
Developed branch coverage tooling for the Erlang VM (BEAM) and extended ExCoveralls at the compiler and AST level. Contributed open-source work in partnership with Dashbit.
Frontend Engineer
Backbone Agency
Feb 2021 - Feb 2022 (1 year)
Rebuilt a real estate platform in React for a design-led agency and performed Core Web Vitals work to reduce page load time.
Frontend Engineer
Convenia
Jan 2020 - Jan 2021 (1 year)
Built a design system in Storybook for a product with 200k+ users and implemented an end-to-end suite in Playwright to reduce UI technical debt.
Frontend Engineer
NAVI
Feb 2018 - Dec 2019 (1 year 10 months)
Worked on frontends for public health products in a regulated environment.
Education
Degrees, certifications, and relevant coursework
Universidade Federal de Minas Gerais (UFMG)
Bachelor of Science, Computer Science
2021 - 2025
B.Sc. in Computer Science at Universidade Federal de Minas Gerais (UFMG) from 2021 to 2025.
Availability
Location
BrazilAuthorized to work in
Website
leomiranda.devJob categories
Skills
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