Wagner Santos

Frontend Engineer

São Paulo, São Paulo, Brazil7 yrs 8 mos experience

Most Likely To SwitchHighly Stable

Key Highlights

Migrated 10+ Angular modules to React/Next.js.
Improved application performance by over 40%.
Delivered investment interfaces for B2B financial platforms.

Stackforce AI infers this person is a Fintech Frontend Engineer with expertise in scalable B2B solutions.

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Skills

Core Skills

React.jsNext.jsReactTypescript

Other Skills

Redux ToolkitReact QueryStyled ComponentsTailwind CSSAWSRedisNode.jsNestJSPrismaTypeORMDockerCI/CDGitGraphQLJest

About

Senior Frontend Engineer specializing in React, Next.js, and TypeScript with 6+ years building production-grade fintech platforms that serve enterprise clients at scale. My background is in high-stakes financial products: investment dashboards, Open Finance infrastructure, and B2B banking interfaces that handle real money for real users. I specialize in translating complex business requirements into performant frontend architectures that scale reliably across large products. 🚀 Key Highlights • Migrated legacy Angular modules to React / Next.js, reducing maintenance complexity and accelerating delivery cycles. • Improved application performance by 40%+ through code-splitting, lazy loading, and bundle optimization. • Designed caching and data-handling strategies that reduced critical API response times by ~30%. • Delivered investment and banking interfaces used across large B2B financial platforms. What separates me from most frontend devs: I care about the seam between product and engineering. I've worked directly with PMs and architects to design frontend systems that don't need to be rebuilt 18 months later. Testing & DX: Jest, React Testing Library, Cypress, Storybook, Vitest Performance & Architecture: Bundle splitting, virtualization, memoization, monorepos (Turborepo), Clean Architecture, SOLID Backend & Infra (supporting): Node.js, NestJS, Prisma ORM, TypeORM, GraphQL, REST APIs, Redis, Docker, AWS, Vercel Languages: JavaScript (ES6+), TypeScript 📍 São Paulo, Brazil (GMT-3) · Available for remote contract roles with US/EU companies · No visa sponsorship required · Overlap with EST/PST available

Experience

Prezensa - formerly esx, squad premium

Senior Frontend Engineer (React/Next.js, TypeScript)

Jan 2022 – Present · 4 yrs 2 mos · São Paulo, Brazil · Remote

Led frontend modernization of Genial Investimentos' B2B investment platform migrating 10+ Angular modules to React/Next.js, serving enterprise clients across one of Brazil's largest digital brokerages.
Key Achievements:
Angular → React migration: Led migration of 10+ legacy modules to React.js / Next.js, ensuring a seamless transition and reducing maintenance complexity.
Performance optimization:
Implemented lazy loading & code splitting, cutting initial load times by ~40%.
Introduced Redux Toolkit with middleware for async flows, improving data consistency and UI responsiveness.
Designed Redis caching strategy, reducing API response times by ~30% on frequently accessed data.
New product features: Delivered asset query modules (fixed income, stocks) and a portfolio profitability dashboard, enabling clients to monitor investment performance in real time.
Shipped investment portfolio dashboard that became a core feature of the platform within 3 months of launch.
Tech Stack:
React.js · Next.js (App Router, SSR/ISR) · TypeScript · Redux Toolkit · React Query · Styled Components · Tailwind CSS · AWS · Redis · Node.js · NestJS · Prisma · TypeORM · Docker · CI/CD · Git · GraphQL

React.jsNext.jsTypeScriptRedux ToolkitReact QueryStyled Components+11

Safra

2 roles

Senior Fullstack Engineer | Team Lead

Nov 2020 – Jan 2022 · 1 yr 2 mos · On-site

Led team of 3 engineers delivering Open Finance features across mobile and web channels
Reduced initial load times by 30%+ via React lazy loading and module splitting
Cut API response times by 30% via Redis caching layer on high-frequency endpoints
Contributed to 15% increase in new client acquisition through Open Finance implementation
Worked closely with architecture team to define frontend standards for the PJ app
Skills:
React | TypeScript | Tailwind CSS | Jest | Zod | Chakra UI | CSS | HTML | Git | RESTful APIs | Jenkins | Scrum | Git | CI/CD | Webpack | Docker | Redis | Node | NestJS | ExpressJS | Prisma | TypeORM | GraphQL | Tanstack | Internationalization (i18n)

ReactTypeScriptTailwind CSSJestZodChakra UI+18

Mid-Level Software developer

Feb 2020 – Nov 2020 · 9 mos · On-site

As a full-stack software developer at Banco Safra a Brazilian bank, I played a key role in developing the bank's B2B app, delivering strategic features such as Open Finance, self-service functionality, and receivables that enabled clients to access better rates on SafraPay machines. I worked with technologies including React, Tailwind CSS, Chakra UI, React Query, AWS, Jenkins, HTML, CSS, JavaScript, and TypeScript to build scalable and robust solutions.
In the Open Finance project, I led the implementation across three different channels: two mobile and one web. This initiative allowed clients to securely share financial data, leading to personalized offers and better financial conditions. The project contributed to a 15% increase in new client acquisition and a 10% decrease in default rates, aligning with the broader benefits of Open Finance, such as increased transparency and competitiveness in the financial sector.
My efforts were distinguished by my autonomy in achieving results and ownership mindset, ensuring objectives were met with excellence. I was widely praised for my "make it happen" attitude and commitment to delivering value. These qualities earned me a promotion to Senior Developer after the successful delivery of the Open Finance project.
Additionally, I developed the self-service module, empowering clients with greater autonomy in managing their financial products, and the receivables module, which optimized rates for SafraPay machines, significantly enhancing client satisfaction and retention. My time at Banco Safra was defined by delivering innovative solutions that improved customer experience and aligned with the institution's strategic goals.
Skills:
React | TypeScript | Tailwind CSS | Jest | Zod | Chakra UI | CSS | HTML | Git | RESTful APIs | Jenkins | Scrum | Git | CI/CD | Webpack | Docker | Redis | Node | NestJS | ExpressJS | Prisma | TypeORM | Tanstack | Internationalization | i18n

ReactTypeScriptTailwind CSSJestZodChakra UI+17

Qintess

Mid-Level Software developer

Nov 2018 – Feb 2020 · 1 yr 3 mos · São Paulo, SP · On-site

Built foreign exchange platform for airport desks using Angular/TypeScript 20% increase in operational efficiency, 15% reduction in service time
Delivered system integration enabling faster, more accurate currency transactions
Performance recognized with direct offer to join Banco Safra full-time

AngularTypeScript

Marketdata

Software Developer

Jun 2018 – Oct 2018 · 4 mos · São Paulo, São Paulo, Brazil

Developed personalized marketing campaign systems for enterprise clients (C&A, Santander) using Angular/Node.js. Delivered 20% lift in conversion rates via data-driven layout personalization.
Skills:
Angular 2+ | TypeScript | Jasmine | CSS | HTML | Git | RESTful APIs | Jenkins | Scrum | Git | CI/CD | Webpack | Node | MySQL | TypeORM | Prisma

Angular 2+TypeScriptJasmineCSSHTMLGit+9