Kristijan J.

Founder and Software Engineer

Pula, Croatia

Experience

Jul 2018 - Present
7 years 5 months
Pula, Croatia

Founder and Software Engineer

Redox Ltd

Operated under Redox Ltd to provide freelance software development, architecture consulting, and end-to-end mobile and cloud solutions for international clients.

Delivered high-quality apps and technical leadership across multiple projects.

Managed all aspects of client engagement—from technical discovery and solution design to implementation and delivery—while ensuring alignment with business goals and timelines.

  • Pushly – Senior Software Engineer: Contributed to mobile SDKs development and integration of event processing backend system in Kotlin using Vert.x and AWS. Developed Infrastructure as Code templates for running various parts of the platform using AWS CloudFormation
  • Domain Money – Senior Android Developer: Led development of Earn and KYC features with strong security focus (storage encryption)
  • Fundingport – Senior Software Engineer: Developed Agency product backend; implemented unit and integration testing via GitLab pipelines
  • Marcus by Goldman Sachs – Senior Android Developer: Built Invest and Checking features; enabled dynamic UI from backend config
  • Guestlogix (via Gun.io) – Senior Android Developer: Created white-label app and SDK with dynamic UI based on backend responses
  • JuitNow (via CodeControl) – Senior Mobile Developer: Delivered features for Android and iOS fridge apps; mentored team members
  • Dr. Oetker (via CodeControl) – Senior Mobile Developer: Built and refactored baking apps for Android and iOS; provided mentorship
  • Smava (via CodeControl) – Mobile Developer: Built secure loan app features; implemented certificate pinning and encrypted storage
  • Johnson & Johnson Inergize/Amplify (via Toptal) – Senior Android/iOS Developer: Delivered dynamic, on-demand UI frameworks
Jan 2016 - Dec 2017
2 years
Zagreb, Croatia

Android Team Lead

Infinum

Led a team of Android developers in designing and delivering high-quality mobile applications for global clients across various industries. Responsible for technical direction, code quality, mentorship, and collaboration with cross-functional teams including design, iOS, and backend.

Drove architectural decisions, reviewed code, and ensured alignment with project goals, timelines, and best practices.

Actively contributed to hiring, onboarding, and career development within the Android team.

Mar 2014 - Jan 2016
1 year 11 months
Zagreb, Croatia

Senior Android Engineer

Infinum

Developed robust, user-focused Android applications for high-profile clients, contributing to all phases of the development lifecycle.

Collaborated closely with designers, backend engineers, and product managers to deliver seamless, scalable solutions.

Took ownership of complex features, optimized performance, and ensured code quality through thorough testing and peer reviews.

Played a key role in mentoring junior developers and promoting best practices across the team.

Mar 2012 - Mar 2014
2 years 1 month
Zagreb, Croatia

Software Engineer

Interactive1

Developed and maintained Android applications and web solutions for media and entertainment platforms.

Delivered features that enhanced user engagement and performance across platforms.

Collaborated closely with designers and backend teams to ensure a consistent and responsive user experience.

Contributed to both front-end and mobile development using modern frameworks and best practices.

Sep 2011 - Mar 2012
7 months
Pula, Croatia

Software Engineer

Superius

Worked on backend systems and business intelligence infrastructure, focusing on Java-based development and database administration.

Designed and maintained data pipelines, implemented backend features, and supported BI reporting needs.

Ensured data integrity, performance, and reliability across critical systems.

Summary

Results-driven software engineer with a strong track record in aligning technology solutions with business goals to deliver high-impact results efficiently. Experienced in leading cross-functional teams and delivering robust mobile applications (Android & iOS) from concept to deployment. Skilled in software architecture, coding best practices, performance optimization, and project delivery. Known for clear communication, strategic thinking, and a collaborative mindset—especially in remote and dynamic environments.

Languages

Croatian
Native
English
Advanced

Education

Sep 2019 - Sep 2022

University Juraj Dobrila Pula

Bachelor's degree, Computer science · Computer science · Pula, Croatia

Quantic School of Business and Technology

Executive MBA · United States

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