Obaid Ur Rehman

Profile

Full stack software engineer with nine years across backend, web, and embedded systems, now building aircraft noise and flight track monitoring software for airports worldwide. Strongest in C#/.NET and Java backends, distributed systems, and performance and cost optimization, with shipped results including a 7.5x faster search path and an 85% cut in infrastructure spend. Master of Science in Data Science from RWTH Aachen University. Authorized to work in the EU.

Experience

1. Full Stack Software Developer

   Jan 2025 – present

   Topsonic Systemhaus GmbH · Würselen, Germany

   Aircraft noise and flight track monitoring systems for airports worldwide

   • Build and extend C#/.NET desktop applications and Vue.js web applications for aircraft noise and flight track monitoring deployed at airports internationally
   • Automated release and deployment pipelines and designed the high availability environment for production monitoring services
   • Profile and optimize application performance, and design REST APIs and database models for flight and measurement data
   • Review teammates' code and contribute to software architecture decisions

2. Backend Developer

   Jan 2022 – Dec 2024

   Better Mobility GmbH · Aachen, Germany

   Multimodal mobility app serving over 500,000 users across five cities

   • Built Java microservices in Quarkus and Spring for a multimodal mobility platform serving over 500,000 users across five cities
   • Cut map tile spend from 2,000 USD to 300 USD per month, an 85% reduction, by introducing disk-based tile caching
   • Reduced place search query time from 300 ms to 40 ms, a 7.5x speedup, by adding Redis caching
   • Improved POI search recall for partial and misspelled place names by tuning fuzzy matching in Elasticsearch
   • Integrated five mobility providers, three on GBFS and two on manufacturer-specific APIs, and built a GraphQL filter service
   • Developed OpenStreetMap data analysis algorithms and optimized navigation routing with GraphHopper
   • Contributed to software architecture, ran code reviews, and wrote unit and integration tests

3. IoT Engineer

   Jan 2017 – Dec 2021

   Synodic Inc · Remote

   Electronic logging devices for commercial fleets in the US and Canada

   • Wrote C firmware for electronic logging devices, parsing J1587, J1939, and J1979 vehicle bus data from truck ECUs
   • Scaled over-the-air firmware deployment to more than 7,000 devices in the field across the US and Canada
   • Built a J1939, J1979, and J1587 protocol simulator for automated ELD testing without physical vehicles
   • Integrated BLE and in-memory engine protocols, and built an Android app for event synchronization
   • Developed a Java server for DOT and CCMTA compliance reporting

4. Working Student, Software Development

   Mar 2021 – Sep 2021

   e.GO MOOVE GmbH · Aachen, Germany

   • Developed ROS 2 software for autonomous electric shuttles
   • Integrated sensors including LiDAR and GPS
   • Improved point cloud processing and object detection
   • Assembled and tested hardware units

Education

Skills

Programming languages

C#, Java, C, C++, SQL, JavaScript/TypeScript, HTML, CSS

Backend and web

.NET (ASP.NET Core, WPF), Spring, Quarkus, Microsoft Orleans, Vue.js, REST, GraphQL, microservices

Databases and messaging

PostgreSQL, MySQL, MSSQL, Redis, Elasticsearch, Apache Kafka

DevOps and tooling

Docker, Kubernetes, GitLab CI, GitHub Actions, Git, Linux, CI/CD automation, high availability deployments

Embedded and hardware

C firmware, OTA updates, BLE, ESP-IDF, PlatformIO, ROS 2, EAGLE, EasyEDA, Autodesk Fusion 360, OnShape

Practices

Code review, software architecture, unit and integration testing, performance profiling

Languages

• English C1
• German B1
• Urdu native

Projects