Cesar KlemesSoftware Engineer

Because first impressions are
decisive 

Software engineer focused on front-end, product interfaces, and integrations.

Planet Sifi
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  • JavaScriptJavaScript
  • TypeScriptTypeScript
  • ReactReact
  • Next.jsNext.js
  • Tailwind CSSTailwind CSS
  • Framer MotionFramer Motion
  • Vue.jsVue.js
  • Node.jsNode.js

Professional profile

Summary, technical focus, technologies, and practices that shape how I work in digital products.

Professional summary

Software engineer with a front-end focus and experience building and evolving interfaces for logistics, e-commerce, and digital products.

I work mainly with React, Next.js, JavaScript, TypeScript, and Tailwind CSS, with hands-on experience in integrations, automations, and support for Node.js services.

My current preference is React and Next.js, but I remain open to other stacks whenever the product, team, or delivery context requires it.

Cesar Profile

Current focus and stack

My main working stack today, without narrowing future opportunities when another stack makes more sense.

  • React and Next.js for product interfaces
  • TypeScript and modern JavaScript
  • Tailwind CSS, componentization, and responsiveness
  • Openness to work with other stacks when needed

Technologies and tools

Technologies I have worked with directly in product work and collaborative delivery.

  • Node.js and REST API integrations
  • GraphQL and service consumption
  • Vue.js and Nuxt.js
  • MySQL and Prisma
  • Git and collaborative workflows
  • React Native for occasional support

Working practices

How I usually operate across product work, collaboration, and technical evolution.

  • SSR/SSG and attention to performance
  • UX/UI and feedback-driven iteration
  • PoC prototyping and technical refinement
  • Documentation and technical reading in English
  • Agile cycles and multidisciplinary collaboration
  • AI-assisted development for delivery acceleration
Projects
Realtime chat app example
An example of a realtime chat application built with Next.js, TypeScript, and Tailwind CSS. It showcases real-time messaging features using WebSockets.
preview image
Timeline

Experience, education, and responsibilities that shaped how I work in product environments.

2023 - 2025

Anjun Express
Front-End Developer2023 - 2025

Worked on the development and evolution of interfaces for logistics and e-commerce operations, focusing on React, Next.js, TypeScript, and usability in high-demand environments.

I integrated the front-end with operational APIs and services related to tracking, order status, incidents, ETA, and logistics journey monitoring flows.

I contributed to real-time features for monitoring inbound, outbound, and parcel movement, prioritizing visual clarity, reliability, and performance.

I worked in short delivery cycles, refined interfaces from user feedback, and occasionally supported Node.js and React Native tasks for integrations and operational-flow maintenance.

Highlights:
  • React, Next.js, and TypeScript applied to logistics and e-commerce interfaces.
  • Operational API integrations for tracking, order status, incidents, and ETA.
  • Real-time updates for monitoring inbound, outbound, and parcel movement.
  • Fast adaptation to changing requirements by translating logistics business rules into workable interfaces.
  • Continuous UX improvement from internal and external user feedback.
  • Complementary Node.js and React Native support for integrations and product-specific flows.
Key skills
ReactNext.jsTypeScriptJavaScriptREST APIsNode.jsReact NativeUX / UI

2023 - 2025

Anhanguera — Systems Analysis and Development (Technologist)

Technologist degree focused on analysis, development, implementation, and maintenance of systems, with an duration of 2.5 years (5 semesters), in online format.

Duration2.5 years (5 semesters)
FormatOnline
Workload per semester395h • 395h • 475h • 465h • 395h
Complementary Activities75h
Semesters
1st Semester
~395h
  • Computer Architecture and Organization
  • Logic Programming and Algorithms
  • Interface and Usability
  • Software Project
  • Applied Mathematics for IT
  • Integrative Project I
2nd Semester
~395h
  • Data Structures
  • Database I
  • Object-Oriented Programming
  • Computer Networks Fundamentals
  • Software Engineering
  • Integrative Project II
3rd Semester
~475h
  • Web Development (HTML5, CSS, JavaScript)
  • Database II
  • Operating Systems
  • Systems Analysis and Design
  • Secure Software Development
  • Integrative Project III
4th Semester
~465h
  • Mobile App Development
  • DevOps and Cloud Computing
  • Information Security
  • Software Testing and Quality Assurance
  • Entrepreneurship and Innovation
  • Integrative Project IV (Pre-Thesis)
5th Semester
~395h
  • Software Architecture
  • Software Project Management (PMI/Agile)
  • System Modeling and Integration (REST APIs)
  • Big Data & Analytics (Introduction)
  • Special Topics in IT (AI/Cloud/Serverless)
  • Final Project / Thesis
  • Complementary Activities (75h)
Key Skills
Web Development (HTML, CSS, JS)OOP and Data StructuresDatabase Management (SQL)Computer NetworksDevOps & Cloud (concepts)Mobile Development (intro)Information SecurityAgile MethodologiesUX / UI & UsabilitySoftware Engineering

2022 - 2023

ALTATECH Systems
Full Stack Developer2022 - 2023

Full-stack work on digital products for the real-estate market, building interfaces in Vue.js and Nuxt.js while supporting integrations, data flows, and service layers.

I implemented integrations with listing portals, CRMs, and external services to support publishing flows, lead capture, scheduling, and automated notifications.

I built advanced search experiences with dynamic filters, geolocation, maps, media galleries, and dashboards for commercial and operational follow-up.

I also supported back-end routines and data persistence, contributing to technical decisions and agile rituals with a focus on feasibility, operational efficiency, and user experience.

Highlights:
  • Vue.js and Nuxt.js interfaces for real-estate digital products.
  • Integrations with portals, CRMs, and external services for publishing, leads, and automation.
  • Advanced search and geolocation with maps, dynamic filters, and stronger property discovery.
  • Dashboards and media galleries supporting commercial and operational visibility.
  • Back-end and data persistence support focused on consistency and business-flow maintenance.
  • Agile routine with Scrum, balancing delivery speed, technical feasibility, and UX.
Key skills
Vue.jsNuxt.jsJavaScriptTypeScriptMySQLREST APIsScrumUX / UI

2021 - 2022

Etec - Francisco MoratoTechnical course in systems developmentModules
Module I
Qualification: Systems Development Assistant
  • Instrumental English
  • Programming and Algorithms
  • Database I
  • Ethics and Organizational Citizenship
  • Digital Design
  • Web Programming I
  • Fundamentals of Computer Science
  • Application Software Operation
Module II
Qualification: Computer Programmer
  • Systems Analysis and Design
  • Systems Development I
  • Database II
  • Embedded Systems
  • Mobile Application Programming I
  • Web Programming II
  • Course Conclusion Work Planning (CCW)
Module III
Technical Qualification: Systems Development Technician
  • Information Systems Security
  • Database III
  • Internet and Protocols
  • Mobile Applications Programming II
  • Web Programming III
  • Language, Work and Technology
  • Systems Development II
  • Course Completion Work (CCW) Development
Key Skills
ComunicationEnglishUser experience (UX)MySQLJavaScript

Let’s build something great together

Want to discuss a project, collaborate, or just say hi? Drop a message or reach me on the links below.

LocationSao Paulo - SP
Phone+55 11 97297-6101