Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Systems Engineer specialized in Blockchain and Mobile development. Passionate about building high-quality products and constantly improving through autonomous learning. Strong communicator with proven skills in initiative, leadership, responsibility, discipline, teamwork, and critical thinking. Able to perform efficient technical research, adapt quickly to new technologies, and thrive within cross- functional teams to deliver impactful solutions.…Systems Engineer specialized in Blockchain and Mobile development. Passionate about building high-quality products and constantly improving through autonomous learning. Strong communicator with proven skills in initiative, leadership, responsibility, discipline, teamwork, and critical thinking. Able to perform efficient technical research, adapt quickly to new technologies, and thrive within cross- functional teams to deliver impactful solutions.

Julio Cesar Gaviria J

Blockchain Developer, Web Developer, App Developer, +1





Systems Engineer specialized in Blockchain and Mobile development. Passionate about building high-quality products and constantly improving through autonomous learning. Strong communicator with proven skills in initiative, leadership, responsibility, discipline, teamwork, and critical thinking. Able to perform efficient technical research, adapt quickly to new technologies, and thrive within cross- functional teams to deliver impactful solutions.…Systems Engineer specialized in Blockchain and Mobile development. Passionate about building high-quality products and constantly improving through autonomous learning. Strong communicator with proven skills in initiative, leadership, responsibility, discipline, teamwork, and critical thinking. Able to perform efficient technical research, adapt quickly to new technologies, and thrive within cross- functional teams to deliver impactful solutions.

Available to hire

Systems Engineer specialized in Blockchain and Mobile development. Passionate about building high-quality products and constantly
improving through autonomous learning. Strong communicator with proven skills in initiative, leadership, responsibility, discipline,
teamwork, and critical thinking. Able to perform efficient technical research, adapt quickly to new technologies, and thrive within cross-
functional teams to deliver impactful solutions.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Beginner

Beginner

Beginner

Beginner

Beginner

Beginner

Beginner

Language

English

Advanced

Spanish; Castilian

Fluent

Portuguese

Beginner

Work Experience

Blockchain & Mobile Dev at Impulse

January 1, 2026 - Present

Design and implement Solidity smart contracts using Foundry; deploy to testnet; fork Polygon and BSC networks; develop a Flutter app with Bloc; integrate REOWN for contract calls and Metamask-like connections; deploy to Polygon; verify contract and upload ABI; configure networks with Firebase Remote Config; launch Android app.

Flutter Mobile Developer at Pitts Crew SAS

January 1, 2022 - Present

Designed and developed a dynamic vehicle-issue bidding system with multimedia submissions; implemented real-time updates via WebSockets; freelanced to fix legacy codebase, migrate to Stacked architecture, and deliver onboarding, OTP login, and signup verification.

Flutter Mobile Developer at Digital Platforms

January 1, 2022 - October 1, 2025

Developed a full Flutter Web FAQ module; migrated Pibox passengers/drivers to Stacked architecture; refactored Mapbox flows with custom animations; built fleet management features; created a lightweight app variant for low-end devices; contributed to ~30 internal projects.

Flutter Mobile Developer at Freelancer - Remote, France

January 1, 2022 - January 31, 2022

Developed new features for two high-traffic mobile apps (Undiz and ETAM); fixed critical bugs; implemented dynamic retrieval of store/product data; improved UX/UI across home, cart, shops, onboarding, and payments; built reusable UI components; integrated PWA event handlers, geolocation, saved stores, and QR code scanning.

Flutter Mobile Developer at Valienta SAS

January 1, 2021 - January 31, 2021

Joined as a Junior Developer; delivered features related to payments, user selection flows, delivery timelines; integrated push notifications using Firebase and CleverTap; resolved bugs; contributed to improving app performance and usability; strengthened Flutter expertise.