Umer is available for hire
Hire UmerUmer Arshad
Verified Expert in Engineering
Software Developer
Location
Lahore, Punjab, Pakistan
Toptal Member Since
October 5, 2021
Umer is a lead software engineer with experience in working with multiple multinational companies and freelance projects. His experience ranges from low-level embedded systems to high-level application software. Umer is an active learner constantly recognized by both clients and colleagues as a problem solver who can successfully manage complex engineering problems and tackle strict deadlines and customer pressure issues.
Portfolio
Afiniti
Sockets, C++, Google Test, TCP/IP, OpenSSL, cURL Command Line Tool, HTTP...
Pentaloop
REST APIs, Azure Active Directory Graph API, cURL Command Line Tool, Libcurl...
INDG Digitale Communicatie B.V.
C, ESP32, C++, Flask, PlatformIO, Firmware over the Air (FOTA), Firmware
Experience
Availability
Part-time
Preferred Environment
Linux, Visual Studio Code (VS Code), Git, C, Python, Data Structures, REST APIs, Amazon Web Services (AWS), ESP32, C++
The most amazing...
...thing I've developed is a high-availability system with multiple nodes responsible for managing a telephony operations service, along with a monitoring system.
Work Experience
Service Lead | Lead Software Engineer
2022 - 2023
Afiniti
- Added TLS support in the communication channels for the high-availability solution. Updated the architecture to a multithreaded design to support multiple TCP client nodes. Added telemetry exporter to display stats over Prometheus and Grafana.
- Traced and fixed bugs using Jira as a reporting tool.
- Contributed to a patent as an author. The patent is filed for the work done for the high-availability solution.
- Added unit-testing scheme for the REST API-based service.
- Integrated Telemetry service along with REST API and other microservices.
Technologies: Sockets, C++, Google Test, TCP/IP, OpenSSL, cURL Command Line Tool, HTTP, REST APIs, Prometheus, Telemetry, JSON
Software Engineer
2022 - 2022
Pentaloop
- Developed a C++ and libcurl-based REST client to interact with OneDrive using MS Graph API. Implemented an authentication workflow using OAuth2.0. Worked with MSAL (Microsoft Authentication Layer) with interactive and silent authentication.
- Used Jira, Confluence, and Bitbucket for project management.
- Worked along with a resource while working on this project.
Technologies: REST APIs, Azure Active Directory Graph API, cURL Command Line Tool, Libcurl, Microsoft Graph API
Firmware Developer for ESP32-based Systems
2022 - 2022
INDG Digitale Communicatie B.V.
- Implemented captive portal for AP mode. Added Firmware over the Air (FOTA) support. Created a flask server to send commands, downloaded and displayed pictures from an external server on screen, and added support for deep sleep mode.
- Displayed low battery levels on screen and tracked tasks milestones and issues using GitHub issues.
- Worked directly with the client providing milestone-based updates, and conducted weekly meetings to discuss progress.
Technologies: C, ESP32, C++, Flask, PlatformIO, Firmware over the Air (FOTA), Firmware
Rasberry Pi Developer
2021 - 2022
Wash - Engineering
- Developed a Flask-based web server for Raspberry Pi to interact and collect data from environment sensors (temperature, humidity, noise, water level, and vibration). Developed a zero-crossing detector circuit to control the relays.
- Used Jira, Confluence, and Bitbucket for project management.
- Helped the client in multiple sessions to replicate the results on their side.
Technologies: Bluetooth, Arduino, Raspberry Pi, Raspberry Pi 3 GPIO, Bluetooth LE
Senior Software Engineer
2021 - 2022
Afiniti
- Owned a Telemetry service that offers multiple telemetric operations using the Pistache framework for C++ and REST APIs. Developed new features and fixed bugs in the high-availability part of the company's product.
- Tracked and traced the development of the product using Jira, the established mechanism.
- Led a team of engineers and supported different teams in designing and fixing bugs of individual services in a microservices-based architecture.
Technologies: C++, Docker, REST APIs, Microservices, Telemetry, C++11, C++14
Software Engineer
2020 - 2021
Afiniti
- Developed a high availability system that manages multiple nodes in different configurations, which involves a very fast switching rate and requires individual services monitoring.
- Worked on the Telephony feature server dealing with SIP 2.0-based message sending and handling.
- Designed and fixed bugs of individual services in a microservices-based architecture for the high-availability system.
- Played a key role as a project manager tracking bugs and features using Jira as a reporting tool.
Technologies: C++, Docker, Microservices, C++11, C++14
Senior Software Development Engineer
2018 - 2020
Siemens Digital Industries Software
- Developed an in-house inter-vehicle system (IVS) embedded software and bootloaders for different microcontrollers and architectures based on ISO specifications for automotive software and multiplexed communication network protocols (CAN and LIN).
- Engaged directly with clients for debugging sessions and support.
- Played a key role as a project manager tracking bugs and features using Jira as a reporting tool.
Technologies: Embedded C, C++, Visual Studio, Vault, Makefile, Microcontroller Programming
Embedded Systems Developer
2017 - 2017
Siemens Digital Industries Software
- Developed program applications for different embedded hardware platforms and simulators.
- Worked on Kernel porting for Nucleus RTOS as part of my role.
- Developed UART and SPI device drivers for different hardware platforms.
- Tracked and fixed bugs using Jira as a reporting tool.
Technologies: C, Embedded C, ARM, Atmel, Real-time Operating System (RTOS), Firmware
Experience
High Availability System
The company needed a high availability system that could ensure continuous operations and eliminate single points of failure.
As the C++ developer for this project, I built the core service. I used the POSIX library to create TCP/UDP and multicast-based server/client. I additionally included a ping-pong mechanism to monitor the status of the nodes in the cluster continuously.
Besides that, I developed a monitoring system that continuously tracked the state of all the services involved in the holistic architecture and triggered specified actions based on various independent services issues.
As the C++ developer for this project, I built the core service. I used the POSIX library to create TCP/UDP and multicast-based server/client. I additionally included a ping-pong mechanism to monitor the status of the nodes in the cluster continuously.
Besides that, I developed a monitoring system that continuously tracked the state of all the services involved in the holistic architecture and triggered specified actions based on various independent services issues.
Home Automation System
I developed a home automation system that included an Android application to control and send the commands to the main controller.
The system's brain contains a Raspberry Pi that stores the data and acts as a gateway routing commands from the Android application to the physical devices connected with the appliance. Edge devices that connect directly to appliances communicate with the Raspberry Pi via RF. The system can be controlled by cellphone using the internet and a standard LAN network.
The system's brain contains a Raspberry Pi that stores the data and acts as a gateway routing commands from the Android application to the physical devices connected with the appliance. Edge devices that connect directly to appliances communicate with the Raspberry Pi via RF. The system can be controlled by cellphone using the internet and a standard LAN network.
E-locked
I developed an electronic locking device called "E-locked" that controls gate locks upon receiving a command from an Android application via TCP sockets or through the internet via MQTT. It supports multiple locks to be operated from a single device. The locks are password-protected and can only be modified using a master key. Keys are encrypted and then stored in the cellphone.
Firmware Developer
Worked as a sole engineer to develop firmware for LILYGO T5-4.7 inch E-Paper ESP32 V3 from scratch.
I implemented a device reset dispatcher to distinguish between startup from deep-sleep and hard reset and a captive portal for the access point configuration of ESP32.
Created a mock Python server using Flask to interact with and send commands to the ESP32 and worked on developing Node.js-based parser to transform HTML, CSS, and JavaScript files into C strings.
Developed code to display static and dynamically obtained pictures from an external server on the Lilygo screen. Configured timeout and buttons as wake-up sources from deep-sleep modes.
Lastly, added the following:
• Dynamic capability to show nearby networks on the captive portal at runtime.
• A feature to download firmware from an external server (FOTA).
• Support of deep sleep mode to conserve battery
• Battery level detection to warn users about low battery levels
I implemented a device reset dispatcher to distinguish between startup from deep-sleep and hard reset and a captive portal for the access point configuration of ESP32.
Created a mock Python server using Flask to interact with and send commands to the ESP32 and worked on developing Node.js-based parser to transform HTML, CSS, and JavaScript files into C strings.
Developed code to display static and dynamically obtained pictures from an external server on the Lilygo screen. Configured timeout and buttons as wake-up sources from deep-sleep modes.
Lastly, added the following:
• Dynamic capability to show nearby networks on the captive portal at runtime.
• A feature to download firmware from an external server (FOTA).
• Support of deep sleep mode to conserve battery
• Battery level detection to warn users about low battery levels
Back-end Development for SOP Violation Detection System
Developed a Flask-based REST server to start, stop, and receive alerts about multiple camera streams. Integration with the AI logic to detect SOP violations and save pictures and videos on Amazon S3 using Boto 3.
Skills
Languages
C, C++, Embedded C, C++11, Python, Java, Verilog, C++14, HTML, JavaScript
Platforms
Visual Studio Code (VS Code), Arduino, Linux, Raspberry Pi, Windows, STM32, Docker, Android, Raspberry Pi 3 GPIO, Amazon Web Services (AWS), AWS Lambda, AWS IoT Core, AWS IoT, Bluetooth LE
Other
Microcontroller Programming, ESP32, Programming, Data Structures, Embedded Software, TCP/IP, UDP, Microsoft Office, Multithreading, Debugging, ESP8266, NodeMCU, Code Review, Analytical Thinking, Microprocessors, Firmware, Tkinter, SIP, Internet of Things (IoT), Embedded Systems, Network Programming, ARM, Atmel, Real-time Operating System (RTOS), PCB, Arduino IDE, Telemetry, Bluetooth, Amazon API Gateway, API Gateways, PlatformIO, Firmware over the Air (FOTA), HTTP, Prometheus, Microsoft Graph API, Multiprocessing
Libraries/APIs
Sockets, REST APIs, NumPy, OpenCV, OpenSSL, Azure Active Directory Graph API, Libcurl
Tools
Git, Jira, MQTT, CMake, Android Studio, MATLAB, Visual Studio, Vault, Makefile, Jenkins, Amazon Cognito, AWS Simple Notification Service (SNS), Keil, cURL Command Line Tool, Boto 3
Paradigms
Socket Programming, Object-oriented Programming (OOP), Microservices
Frameworks
Qt, Flask, Boost, Google Test
Storage
Databases, Amazon DynamoDB, Amazon S3 (AWS S3), JSON
Education
2020 - 2022
Master's Degree in Electrical Engineering
Information Technology University - Lahore, Pakistan
2014 - 2018
Bachelor's Degree in Electrical Engineering
University of Engineering and Technology - Lahore, Pakistan
Certifications
DECEMBER 2021 - PRESENT
Introduction to the Boost C++ Libraries
Pluralsight
DECEMBER 2021 - PRESENT
Exploring AWS IoT
Udemy
DECEMBER 2021 - PRESENT
AWS Serverless APIs & Apps - A Complete Introduction
Udemy
SEPTEMBER 2021 - PRESENT
C++ Object Basics: Functions, Recursion, and Objects
Codio | via Coursera
SEPTEMBER 2021 - PRESENT
Object Oriented C++: Inheritance and Encapsulation
Codio | via Coursera
AUGUST 2021 - PRESENT
C++ Basics: Selection and Iteration
Codio | via Coursera
AUGUST 2021 - PRESENT
NumPy Python
Udemy
AUGUST 2021 - PRESENT
A Complete Python, TkInter Hands-on
Udemy
AUGUST 2021 - PRESENT
Qt 6 Core Beginners with C++
Udemy
AUGUST 2021 - PRESENT
Qt 6 Core Intermediate with C++
Udemy
AUGUST 2021 - PRESENT
Mastering Visual Studio Code
Udemy
JULY 2021 - PRESENT
C++ Basic Structures: Vectors, Pointers, Strings, and Files
Codio | via Coursera
JULY 2021 - PRESENT
C++ Programming—From Scratch to Advanced
Udemy
JULY 2021 - PRESENT
DevOps Fundamentals
Udemy
JULY 2021 - PRESENT
Docker for Beginners
Udemy
JULY 2021 - PRESENT
Master C++ Programming - From Beginner to Advance
Udemy
JULY 2021 - PRESENT
Python and Flask Demonstrations
Udemy
JUNE 2021 - PRESENT
Introduction to the Internet of Things and Embedded Systems
University of California | via Coursera
JUNE 2021 - PRESENT
Introduction to TCP/IP
Coursera
JUNE 2021 - PRESENT
Data Structures in Python
Udemy
MAY 2021 - PRESENT
The Foundations of SIP
Udemy
MAY 2019 - PRESENT
Socket Programming in C from Scratch
Udemy