Aleksandar Simic

• Client Engagements: Collaborated with startups to develop mobile applications using Flutter, Swift and Kotlin, enabling rapid deployment and iteration across multiple platforms. Spearheaded the development of 7 mobile apps, focusing on sectors like fitness, well-being, and telemedicine. Key projects included WebRTC integration for real-time communication, API communication for seamless data exch

• Client Engagements: Led over a dozen projects for clients such as Nike, Coca-Cola, and Johnson & Johnson, ranging from startups to large enterprises. As Lead Developer for a Y-Combinator-funded startup, built a highly optimized app, achieving 99.5% app stability, reducing crash rates by 40%, and contributing to a 20% increase in the user base within the first 6 months.

• Leadership & Mentoring:

Took a sabbatical to focus on personal well-being, health, and self-improvement. Dedicated time to exploring new methodologies in mobile development and initiated a personal project using Flutter, aiming to improve performance in future work.

• Served as a Tech Lead, leading Android and iOS teams while driving OKR planning, code quality, and team performance.
• Conducted 1:1s, pair programming sessions, and mentorship programs to support other engineers and foster team growth.
• Led the hiring process for 15+ engineers, optimizing company processes and increasing mobile team performance by 300%.
• Defined and implemented development pr

An IoT-driven property management platform for smart buildings, focused on automating and optimizing residential and commercial spaces.

Meeliana is an innovative IoT startup redefining smart property management through automation, data insights, and real-time control of smart buildings. The platform integrates with various sensors and smart devices to provide a unified, intelligent property manag

• Developed a freelance medical project, developing both native Android and iOS applications designed to assist doctors in accurately and efficiently calculating pediatric medication doses.
• Ensured the implementation of a highly reliable and user-friendly system, addressing the complexity and sensitivity of medical dosage calculations.
• Collaborated closely with cross-functional team members to

• Lead Android Engineer responsible for developing a HIPAA-compliant Android application in Java, with continuous improvements across individual components. Building complex screens and ensuring high-quality user experiences with high crash-free rate.
• Initially worked with MVP architecture, later transitioning to MVVM as the project evolved, optimizing the codebase for maintainability and scalab

• Voluntary: Worked closely with the Toptal Core Team to build and nurture the Toptal community in Niš. Organized multiple meetups, workshops, and conferences, including NišIT community events. Advocated for remote work and freelancing, resulting in a 10x increase in Toptal members in the region.

• Speaker & Leader: Regularly spoke at meetups and the Niš 3.0 Conference, promoting the freelance ec

• Lead Developer for multiple HIPAA-compliant health-related Android applications using Java and Kotlin, overseeing teams of varying sizes.
• Mentored and supported 5+ junior developers, conducting weekly code reviews and pair programming sessions, helping improve team collaboration and reduce development time by 30%.
• Developed abstract, dynamic handling of use-cases with customizable UI and con

• Led the development of the iOS fitness application in Swift, which primarily communicated with smart devices and sensors using Bluetooth, stabilizing connectivity and ensuring high reliability for syncing BLE devices.
• Refactored the app architecture, introducing MVVM, dependency injection, and other design patterns to improve code maintainability and scalability.
• Enhanced Bluetooth communica

• Oversaw the development of Android applications, managing the mobile team’s daily activities and ensuring tasks were completed on time and in alignment with project goals.
• Participated in defining organizational practices to streamline the development process.
• Enforced code review processes to maintain code quality, ensuring the stability of the application and the consistency of development

• Founded and managed an outsourcing agency, leading a team of 13 employees in the successful delivery of diverse projects.
• Directed a team of Android engineers in the development of 15 applications, primarily using Java and PhoneGap, ensuring the delivery of high-quality products within deadlines.
• Spearheaded the development of an enterprise-level Android application for the oil industry, des

• Responsible for the development of half a dozen Android applications using Java and PhoneGap, integrating Google’s services and REST APIs for seamless communication.
• Designed and implemented a Java-based image analysis algorithm to determine users' heart rates using fingertip recordings.
• Advocated for and enforced best practices, including the MVP architectural pattern, and leveraged industr

• Designed and developed a fully automated, distributed test system in C#, executing millions of tests daily.
• Integrated all existing PDF-to-DOC conversion test tools into the main distributed test system, enabling seamless access for developers.
• Enhanced existing test tools by implementing parallel test execution, improving efficiency by an order of magnitude.
• Developed an automated C# tool

• Developed multiple beginner-level Android applications using Java, gaining expertise in mobile application fundamentals.
• Designed and implemented various websites, web pages, and systems using a range of technologies.
• Integrated third-party APIs, including JustGiving, Twitter, Google+, Facebook, Google Maps, and PayPal, utilizing OAuth authorization where applicable to enhance security and u

Apr 2026

May 2024

Software engineering studies, with focus on development of mobile applications