Summary
Overview
Work History
Education
Skills
Websites
Timeline
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Ozan Ofkeli

Ozan Ofkeli

Ottawa,Canada

Summary

Accomplished Technical Lead with expertise in mobile application development and cloud architecture, previously at Celestra Health Systems. Spearheaded cross-functional projects, enhancing team collaboration and delivering innovative digital health solutions. Skilled in Swift and Node.js, specializing in CI/CD practices and agile frameworks. Demonstrated ability to lead projects that drive significant strategic outcomes.

Overview

14
14
years of professional experience

Work History

Technical Lead

Celestra Health Systems
Ottawa, ON
04.2025 - Current
  • Lead and manage five cross-functional projects across Android, iOS, backend, frontend, and gait-analysis platforms, coordinating workstreams between mobile, web, machine learning, and hardware-integrated teams.
  • Spearhead the development of digital health solutions that leverage smart insoles and machine learning models to extract digital biomarkers from gait patterns, enabling the diagnosis and monitoring of neurological disorders such as Multiple Sclerosis, Parkinson’s Disease, and CIDP.
  • Architected, built, and maintained scalable backend systems using Node.js, TypeScript, MongoDB, and Redis, while leveraging a wide range of AWS services (e.g., Lambda, API Gateway, S3, Cognito, DynamoDB, CloudWatch) to ensure high performance, security, and scalability in cloud infrastructure.
  • Drive adoption of CI/CD pipelines across all codebases using tools like GitHub Actions and Fastlane, enabling rapid, automated, and reliable deployments.
  • Maintain a strong focus on code quality, with high coverage of unit tests, integration tests, and UI automation, contributing to long-term maintainability and clinical-grade reliability.
  • Collaborate with data scientists, domain experts, 3rd party hardware vendors and occasionally patient coordinators to shape digital health solutions that align with clinical objectives, real-world patient needs, and research-driven requirements.
  • Responsible for delivering a scalable Python-based ML/AI gait analysis service deployed in a live AWS environment, including infrastructure design, project ownership, and repository management.
  • Foster an agile engineering culture, supporting sprint ceremonies, continuous feedback, and full-cycle development ownership from design to deployment.

Full Stack Software Engineer

Wesley Clover Global R&D
Istanbul, Turkiye
09.2021 - 03.2024
  • Contributed to the development of early-stage startups within the Wesley Clover global ecosystem, delivering full-stack solutions across backend, web, and mobile platforms.
  • Built and maintained scalable backend systems using Node.js, TypeScript, MongoDB, Redis, and AWS services (Lambda, API Gateway, S3, DynamoDB, Cognito).
  • Developed modern, responsive web applications with React and TypeScript, ensuring usability and performance.
  • Delivered robust features for a native iOS application using Swift, enabling real-time communication and synchronization with backend services.
  • Actively participated in Agile workflows, sprint planning, code reviews, and close collaboration with product teams to iterate rapidly in startup environments.
  • Designed and implemented cloud-native architectures with an emphasis on reliability, scalability, and maintainability.

Mobile Software Development Team Leader

DAZN Group
Istanbul, Turkey
09.2020 - 09.2021
  • Led the successful migration from a legacy mobile app to three standalone applications (Mackolik and Sahadan, Match en Direct), carefully planning the transition strategy while proactively identifying and mitigating risks that could impact the business model.
  • Promoted to Team Lead following the successful product split, taking ownership of building and mentoring a high-performing mobile development team.
  • Oversaw recruitment and onboarding of talented developers, and actively transferred critical knowledge on both the shared codebase and the sports media domain.
  • Managed a team of 4 developers while continuing to contribute hands-on as a mobile developer, delivering new features and maintaining the codebase.
  • Played a key role in Agile development, ensuring effective sprint planning, daily standups, and cross-functional coordination.
  • The Mackolik & Sahadan mobile apps shared a common codebase and collectively served over 5.5 million monthly active users.

Mobile Software Developer

DAZN Group
Istanbul, Turkey
03.2016 - 09.2020
  • Contributed to both iOS and Android development of Mackolik and Sahadan, two of Turkey’s most popular sports apps, with a focus on feature maintenance and stability.
  • Collaborated with DAZN’s global mobile development team, contributing to international live score apps such as Goal Live Scores, Voetbologne, Match en Direct, and Spox.
  • Worked alongside distributed teams across Poland, the UK, and France, gaining valuable experience in cross-cultural collaboration, codebase ownership, and Agile development practices.
  • Played a key role in adopting best practices, improving app architecture, and ensuring clean and maintainable code using Swift and Kotlin.
  • As part of a strategic decision, took ownership of a cloned version of the global app codebase, managing and evolving it locally for the Istanbul team as the designated mobile code owner.
  • Gained hands-on experience with Agile methodologies, strengthened communication and empathy working with international colleagues, and grew as a reliable contributor in a large-scale mobile engineering team.

Mobile Software Developer

Turkcell Technology
Istanbul, Turkey
11.2014 - 03.2016
  • Worked on the development of BiP, Turkey’s first and most widely used local instant messaging app, with over 3 million downloads during my tenure.
  • Collaborated with a team of iOS developers to build core messaging features, leveraging the XMPP protocol for real-time communication and implementing scalable local storage using Core Data.
  • Designed and implemented VoIP features (voice and video calling) on the iOS client using open-source libraries and industry protocols such as SIP (for signaling) and RTP (for media transmission).
  • Contributed to the Android client as well, developing an early proof-of-concept for VoIP capabilities, demonstrating cross-platform initiative and versatility.
  • Gained deep expertise in mobile communications, protocol-level networking, and high-performance messaging system design.

IOS Developer

Hepsiburada.com
Istanbul, Turkey
10.2013 - 11.2014
  • Led the development of Hepsiburada 2.0, the company’s first in-house iOS application, delivering the app independently and gaining deep experience in mobile software architecture and production deployment.
  • Collaborated with ThoughtWorks consultants during their Agile coaching engagement with Hepsiburada, gaining hands-on experience in Agile methodologies such as Scrum, Kanban, Extreme Programming (XP), and user story-driven development.
  • Practiced Test-Driven Development (TDD) and introduced Behavior-Driven Development (BDD) principles to align test cases with business expectations and user-centric workflows.
  • Integrated Jenkins CI for automated build pipelines, including Xcode build, test execution, and AdHoc distribution for QA via post-build scripts, promoting DRY (Don't Repeat Yourself) principles.
  • Researched and implemented Calabash for cross-platform automated acceptance testing, leveraging Gherkin syntax to enable collaboration between technical and non-technical stakeholders.
  • Directly contributed to increasing the iOS app’s mobile conversion rate from 1.0 to 4.5, with the app reaching over 4 million downloads.

Mobile Application Developer

Kariyer.net
Istanbul, Turkey
11.2011 - 10.2013
  • Joined during the early stages of mobile transformation in Turkey and played a pioneering role in launching Kariyer.net’s first mobile applications.
  • Led the Android app development from scratch, successfully releasing the first version of the company’s job search platform for mobile users.
  • Subsequently developed and maintained the iOS application independently, contributing significantly to the company’s mobile presence.
  • Learned and applied Objective-C for iOS development through self-directed learning, including in-depth reading and Stanford University course materials.
  • By the time of departure, mobile apps accounted for approximately 40% of all job applications, becoming a key business channel.
  • Elevated Android skills from a university-level foundation to production-grade expertise in a high-traffic commercial environment.

Education

MBA -

Isik University
Istanbul
01.2016

Information Technologies

Isik University
Istanbul
01.2011

UK courses

LSI English School
Portsmouth

InHolland Hoghschool
Amsterdam

Skills

  • Project management
  • CI/CD pipelines
  • Cloud architecture
  • Backend development
  • Agile methodologies
  • Team leadership
  • Test-driven development
  • Cross-functional collaboration
  • DevOps principles
  • Software architecture design
  • Mobile application development
  • Swift programming
  • Nodejs development
  • Cloud infrastructure
  • VoIP applications
  • React
  • Proficient in Java and kotlin

Timeline

Technical Lead

Celestra Health Systems
04.2025 - Current

Full Stack Software Engineer

Wesley Clover Global R&D
09.2021 - 03.2024

Mobile Software Development Team Leader

DAZN Group
09.2020 - 09.2021

Mobile Software Developer

DAZN Group
03.2016 - 09.2020

Mobile Software Developer

Turkcell Technology
11.2014 - 03.2016

IOS Developer

Hepsiburada.com
10.2013 - 11.2014

Mobile Application Developer

Kariyer.net
11.2011 - 10.2013

MBA -

Isik University

Information Technologies

Isik University

UK courses

LSI English School

InHolland Hoghschool

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Ozan Ofkeli