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John Styves Vallon

@johnstyvesvallon

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Technical support advisor for mobile and POS systems who troubleshoots application, API, and connected-device issues.

United States

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What I'm looking for

I'm available for customer-facing technical support work and am comfortable working remotely, navigating multiple software systems, and adapting to structured schedules, coaching, feedback, and performance expectations.

At JPMorgan Chase, I investigated mobile application crashes, API problems, unexpected behavior, and performance concerns. I used logs, monitoring, and debugging to identify root causes and communicate findings to team members and stakeholders.

At RLMV L.L.C., I supported POS, payment-oriented, mobile, and connected-device workflows, including Sumni POS devices and BLE-connected functionality. Earlier, I developed Android and iOS applications and troubleshot connected-device communication and firmware-update issues.

Experience

Work history, roles, and key accomplishments

Software Engineer - Application Support

JPMorgan Chase

Nov 2024 - Feb 2026 (1 year 3 months)

Investigated and resolved mobile application issues including crashes, API problems, and performance concerns. Collaborated with Product Owners, engineers, and testing/release teams in a fast-paced financial-services environment.

Mobile Apps APIs Debugging Log Analysis Monitoring Root Cause Analysis Stakeholder Communication Agile

Technical Lead - POS & Mobile Systems

RLMV L.L.C.

Dec 2023 - Nov 2024 (11 months)

Supported POS, payment-oriented, mobile, and connected-device workflows, diagnosing software, device, API, and connectivity problems. Integrated and troubleshot Sumni POS devices and BLE-connected functionality.

POS systems Mobile Apps Connected Devices APIs Connectivity Debugging Log Analysis Root Cause Investigation

Software Engineer - Application Support

Citi Group

Mar 2021 - Nov 2023 (2 years 8 months)

Supported secure mobile applications and investigated application, API, data, synchronization, and performance issues. Worked with Product Owners and engineering teams to clarify problems, troubleshoot defects, and test solutions.

Mobile Apps APIs Data Synchronization Performance Debugging Logging Monitoring Agile Knowledge transfer

Mobile Application Developer - Connected Devices

Interactive Technologies

Feb 2020 - Jul 2020 (5 months)

Troubleshot Android applications communicating with healthcare/IoT devices over Bluetooth Low Energy (BLE). Diagnosed device communication and firmware-update issues and developed reusable OTA update functionality.

Android Bluetooth Low Energy IoT Firmware Updates OTA Debugging Troubleshooting

Mobile Application Developer

Le Nouvelliste

Nov 2014 - Apr 2019 (4 years 5 months)

Developed and maintained consumer mobile applications and resolved user-impacting defects, synchronization issues, application failures, and performance problems. Supported Android and iOS product delivery and ongoing maintenance.

Android iOS Mobile Apps Synchronization Debugging Performance Maintenance

Software Engineer

Transversal

Jul 2012 - Feb 2014 (1 year 7 months)

Supported mobile and web applications by troubleshooting software, networking, local-data, and backend-integration issues. Worked with technical teams to diagnose problems and maintain applications.

Mobile Apps Web Applications Troubleshooting Networking Backend Integrations