Senior Mobile Engineer · Tech Lead · Colombian–Italian

Cesar Ramirez

Mobile engineering. Technical leadership.

Android · iOS · Flutter · Mobile architecture

I build and evolve Android, iOS and Flutter products, connecting architecture, business needs and teamwork.

Milan · Europe & Americas · Mobile development since 2018

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Experience guides my decisions. AI accelerates execution. I validate architecture, code and quality before delivery.

Let’s talk
Cesar Ramirez Filomena

Projects & contributions

Selected products and challenges I have worked on, from industrial operations to healthcare and entertainment apps.

Industrial / Productivity

Vocalize

Industrial platform that supports logistics operations through voice-guided workflows. Enables hands-free work and integrates ZPL printing, industrial devices and IoT.

Flutter Android Voice Tech ZPL
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The challenge

Support repetitive tasks such as picking through an Android application with voice-guided workflows tailored to industrial operators’ needs.

My contribution

Implemented voice workflows and contributed to the application’s technology updates. Resolved issues and provided client support, taking projects forward independently with attention to day-to-day operations.

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Healthcare / US

MD Claim

Android application for US healthcare that brings together procedures, schedules and clinical workflows, with a focus on stability and security.

Android Kotlin Security
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The challenge

Introduce new features and resolve client-reported issues while maintaining consistent behavior across the Android and iOS applications.

My contribution

Grew from developer to Android team lead. Contributed to goal definition, feature implementation and quality testing, coordinating with iOS to align both applications and resolve issues promptly.

View on Play Store
Entertainment / Gamification

Partecify

Entertainment application for Android and iOS, built with Flutter. Integrates interactive games, user registration, biometric access and event history, with dynamic content managed through Firebase.

Flutter Firebase Gamification
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The product

An entertainment experience combining interactive games and event participation, with user registration, biometric access and activity history.

Technical approach

A personal project built with Flutter for Android and iOS, using a modern architecture and Firebase to manage dynamic content.

Android iOS

RDS ecosystem

Professional music and radio products I contributed to as part of the team. Each app offers its own listening experience.

Music / Entertainment

RDS 100% Grandi Successi

Official RDS application bringing together live radio, on-demand content and event experiences. Includes Wallet access, studio interaction and Time Machine playback.

Android iOS Media Events
Android iOS
Music / Entertainment

RDS Active

RDS music application that accompanies workouts and physical activity with a selection of current hits.

AndroidiOSAudio
Android iOS
Music / Entertainment

RDS Relax

RDS application dedicated to listening and relaxation, featuring live radio and information about the artists and songs on air.

AndroidiOSAudio
Android iOS
Music / Entertainment

RDS Miami

RDS music application inspired by the atmosphere of Miami, featuring a selection of English, Spanish and Italian hits.

AndroidiOSAudio
Android iOS

Other products

Events / Live Experience

PopApp Event

Live event application combining QR and Wallet access, real-time notifications, selfies and interactive games with live and on-demand RDS content.

Android iOS Wallet Live Events
Android iOS
Healthcare / US

MD Chat

Private messaging application for securely sharing medical information, with end-to-end encryption and attention to regulatory requirements.

Android Kotlin E2E Encryption
View on Play Store

Web project

Travel / Tourism

Vaxvi

Travel agency website with a shopping cart and online payments. Its design makes it easy to explore the offerings and complete a purchase.

WordPress UX E-commerce
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About me

I am a Senior Mobile Engineer and Tech Lead, building products for industry, healthcare and entertainment since 2018.

My experience combines independent project delivery and Android team leadership, working directly with clients to define and address their needs.

I work with maintainable architecture, pragmatic decisions and attention to software quality.

Based in Milan, with a career across Colombia and Italy and experience with teams in Europe and the Americas.

How I can help

Three ways I can contribute to your product and team.

Architecture & modernization

I review existing apps and help evolve their structure and technologies to support maintenance and development.

Technical leadership

I connect the team with the client, clarify requirements and support technical decisions and problem-solving.

Android, iOS & Flutter development

I implement features and integrations, and contribute to testing and release preparation.

Technical expertise

Technologies and practices I apply according to project needs.

Mobile development

Android / Kotlin Flutter / Dart iOS / Swift Jetpack Compose SwiftUI / UIKit

Architecture & quality

Clean Architecture MVVM SOLID Dependency Injection State Machines Code Review

Integrations & releases

Firebase REST / GraphQL OAuth2 CI/CD Fastlane Play Console App Store Connect

Professional Experience

Dec 2025 - Present

Senior Mobile Developer · Tech Lead / Team Lead functions

Publicis Sapient | Milan, Italy

Joined a native mobile development team and grew into the technical point of contact between developers and the client, taking on leadership of the internal team.

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  • Became the technical point of contact between the development team and the client, helping align product needs with implementation decisions.
  • Contributed to requirements definition and technical decision-making to turn client needs into actionable development work.
  • Helped resolve technical problems and delivery blockers, supporting the team in moving development forward.
  • Took on leadership of the internal team, providing technical guidance and coordinating with the client.
  • Used AI-assisted workflows with the team to accelerate development, applying engineering judgment to the solutions.
Jun 2024 - Nov 2025

Software Developer

KFI Technologies | Milan, Italy

Developed native Android and Flutter applications for industrial clients, independently taking projects forward from solution proposals to implementation and support, with a focus on operational productivity.

View responsibilities
  • Implemented voice-guided workflows in Vocalize, enabling operators to carry out repetitive tasks such as picking through an Android application.
  • Proposed and delivered mobile solutions to address industrial clients’ operational needs, taking projects forward independently.
  • Resolved application issues and provided client support to help keep operational workflows running.
  • Updated technologies in existing mobile applications, contributing to the evolution and maintenance of the products.
Nov 2023 - Jun 2024

Software Developer (Consultant)

HAYS | Milan, Italy

Worked as a mobile development consultant on projects for clients in northern Italy, independently proposing and developing solutions to address their operational needs.

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  • Took mobile projects forward independently, from solution proposals to implementation, adapting them to each client’s needs.
  • Analyzed client problems and translated them into technical proposals and mobile applications designed to address them.
  • The strong results of my collaboration with KFI Technologies led to my joining the company directly through an agreement between the two companies.
Mar 2021 - Jul 2023

Mobile Developer Lead

Wiedii | Cúcuta, Colombia

Joined MD Claim, Wiedii’s main project, as a developer and grew into the Android team lead role, contributing to goal definition, software quality and the resolution of client issues.

View responsibilities
  • Took on leadership of the Android team and contributed to defining goals and implementation decisions for new features.
  • Helped resolve client-reported issues promptly, coordinating their resolution with the Android team.
  • Participated in testing and quality validation to verify the behavior of new features and fixes.
  • Coordinated with the iOS team to align feature behavior and deliver consistent results across both applications.
Dec 2018 - Feb 2021

Freelance Mobile Developer

Independent | Colombia / Remote

Began my professional career after graduating, working directly with clients in Colombia to propose and develop tailored mobile applications that addressed specific needs.

View responsibilities
  • Identified client needs and translated them into requirements and proposals for dedicated mobile applications.
  • Proposed and developed a native Android application for an urban mobility concession operator in Colombia, designed to display real-time traffic enforcement camera locations that changed daily.
  • Integrated Google Firebase to keep location information up to date in the application.
  • Developed other tailored mobile projects, taking solutions from the initial proposal through implementation and client delivery.

Let's talk

I’m open to senior mobile roles and consulting projects where I can turn product needs into reliable mobile solutions, strengthen delivery and guide teams through technical decisions.

Email me LinkedIn
Location

Milan, Italy