CATHOLIC APP · iPHONE
Confession Helper
An iPhone app for personal preparation for confession.
FAITH · WORK · PROJECTS
All praise and glory belong to God. He is the source of every inspiration for the work shared here.
Projects01 / PORTFOLIO
A place for apps and other work, brought together as they grow.
CATHOLIC APP · iPHONE
An iPhone app for personal preparation for confession.
02 / ABOUT
My name is Mario Krajačić. I am a Senior Software Engineer at Elixirr Digital, with experience leading a software development team. My work brings together Python, web applications, data and AWS.
Alongside my professional work, I develop free, non-commercial mobile apps in Swift.
Led a development team, monitored progress, communicated with clients and selected technologies. Developed Django web applications using AWS RDS, EC2 and Elastic Beanstalk.
Built APIs with Flask and FastAPI, AWS S3, Lambda and API Gateway; worked with Pandas, SQL and external application integrations. Researched and developed proofs of concept. The profile also lists Data Engineer assignments (12/2022 – 03/2023: data lakes, Redshift, Glue, Tableau) and IoT Engineer assignments (04/2023 – 05/2023: Python, state machines, multithreading and Windows services) during this period.
Developed custom Odoo and OpenERP modules for accounting, purchasing, warehouse management, sales and reporting. Used Python, PostgreSQL, ORM, QWeb and XML, with external API integrations.
Built Django and Flask applications for small businesses, including portfolio and single-page websites.
Managed purchasing, supplier communication and negotiations, inventory monitoring and ordering process improvements. Maintained computers, networks, peripherals and business applications.
Handled office administration, cash register monitoring, vehicle fleet administration, reporting and employee time and attendance records.
Provided technical support for internet and mobile banking, diagnosed issues, assisted users by phone and email, and escalated cases through the helpdesk.
Bachelor’s degree · Information Technology
Co-leading a team of volunteer developers with two fellow team leads. Involvement in the YouVersion initiative for Bible.com and reviewing contributors’ pull requests.
LinkedIn profile · November 2026
03 / CONTACT
For a question about this website, my work or a project, you can reach me by email.
info@mariokrajacic.dev