Publication
Context Validation in Domain-Driven Design
https://www.toptal.com/scala/context-validation-in-domain-driven-design
Josip is available for hire
Hire JosipJosip Medic
Verified Expert in Engineering
Software Developer
Location
Split, Croatia
Toptal Member Since
June 18, 2014
Josip is a team player experienced in the design and development of complex data systems. He is open and communicative, able to communicate ideas clearly and effectively, and applies his analytical nature to building new systems and exploring new concepts quickly and with an eye for quality. He is an experienced Agile developer and works well in a high-pressure environment.
Portfolio
Roomi, LLC
Elasticsearch, MongoDB, Express.js, Mongoose, ECMAScript (ES6), Node.js
Habiplace, Ltd.
Angular, Spring, Play Framework, Java 8, Scala
Big Room Studios
Angular, PostgreSQL, Hibernate, Java
Experience
Availability
Part-time
Preferred Environment
Git, MacOS, Linux, WebStorm, IntelliJ IDEA
The most amazing...
...thing I've done is Habiplace, an online property network. I've Co-founded and held CTO role for one and half year. We raised seed investment and built MVP.
Work Experience
Senior Software Engineer
2018 - 2018
Roomi, LLC
- Worked as a part of the back-end team.
Technologies: Elasticsearch, MongoDB, Express.js, Mongoose, ECMAScript (ES6), Node.js
Co-founder, CTO
2017 - 2018
Habiplace, Ltd.
- Organized the development team.
- Designed the architecture and data extraction.
- Helped define user stories.
- Raised seed investment of 125,000 GBP.
Technologies: Angular, Spring, Play Framework, Java 8, Scala
Senior Software Engineer
2016 - 2018
Big Room Studios
- Developed the back-end and front-end.
Technologies: Angular, PostgreSQL, Hibernate, Java
Senior Software Engineer
2013 - 2015
Reversing Labs
- Collected malware and goodware samples from various providers.
- Managed various services for Vertica logging. Logging all collected events about samples into the Vertica analytic database for later processing.
- Created daily reports of running services based on the Vertical Analytics database. Aggregated all vertical data after collection, allowing daily reports to be easily fetched.
- Worked on an aggregation service managing analytical data and making daily aggregations.
- Created reports using Jasper Reports. Worked on a Jasper Reports Server for managing created reports.
Technologies: JasperReports, Vagrant, Vertica, Python
Senior Software Engineer
2014 - 2014
Peerspace (via Toptal)
- Designed application Architecture.
- Developed the back-end software.
- Managed testing, staging, and production servers.
- Reviewed code.
Technologies: PostgreSQL, Spring Boot, Java
Senior Software Engineer
2013 - 2014
Oradian
- Worked on the architecture design of the Instafin microfinance product. Created modular application parts that can easily be decoupled.
- Worked on the architecture design and application development of the Instafin microfinance product. Provided real solutions to technology problems facing financial service providers.
- Handled back-end development of the Instafin application. Developed the back-end using Scala.
- Created the Instafin application front-end. Developed the front-end using Scala template, Bootstrap Framework, JavaScript, and Undescore.js.
- Managed Launch and Learn sessions twice a week for developers to discuss clean code, best practices, and code improvement-related techniques.
Technologies: Jira, PostgreSQL, JavaScript, jQuery, Play Framework, Scala
Medium Software Engineer
2011 - 2013
PayPal
- Worked on an eBay Lifestyle deals project allowing multiple providers to list offers, deals, and coupons on eBay. Allowed eBay users to buy their deals and receive coupon codes within minutes on their eBay accounts.
- Allowed multiple providers to list their offers on eBay.
- Developed a network project, aggregating offers from multiple providers (Entertainment, Signpost, Zozi, Crowd savings, Living Social, Juice in the City, and more).
- Supported offers through PayPal services.
- Hunted exceptions, checking all services using app health tools.
Technologies: Poker, Jira, Memcached, MySQL, MongoDB, Spring, Play Framework, Scala, Java
Junior Software Engineer
2010 - 2011
Where, Inc.
- Worked on a campaign manager administration tool responsible for managing campaigns in the Where Advertising Network and synchronizing between ad servers working on multiple publisher networks.
- Worked on the Where advertisement server, creating banners serving end users.
- Managed release cycles of the campaign manager application.
- Located and corrected bugs in the app.
Technologies: Poker, Jira, Akamai, Memcached, MySQL, MongoDB, Web MVC, Spring, RMI, Java
Student Co-op
2007 - 2009
Larus d.o.o.
- Created a room master system for controlling hotel rooms.
- Developed a hotel SOS system.
- Designed a system for my master's thesis for control of a touchscreen with 240x128 resolution, using an 8-bit Toshiba T6963C processor.
- Soldered hardware.
- Programmed in C.
Technologies: C
Experience
RESTful Scala Play Framework 2.4 Application
A restful Scala Play framework 2.4 application using Akka, Reactive Slick 3.0, Akka Actors for ActionLogs, JWT Token user identification and authentication, DDD domain validation, and Guice Dependency Injection
Code Sampling with Scala, Play
https://github.com/git-josip/scala-backend-samplingThis is a sample application using Scala, PlayFramework, and Postgres.
- Slick FRM for DB connection
- Akka Actors for ActionLog
- Deep validation where all errors, warnings, and info messages are collected and presented
- All REST responses are unified with the same structure every time, so it's easier to handle errors, warnings, and messages as well as specific data on pages.
Responses are structured for global and local messages. Local messages are coupled to some field, e.g., "Username is too long. Allowed length is 80 chars." Global messages are messages that reflect all data on page, e.g., "User will not be active untill is approved." Messages have three levels: ERROR, WARNING and INFORMATION.
(example response: http://demo3385913.mockable.io/api/v1/single-create-response)
- JSON Web Tokens (JWT) for user identification and authentication
- Divided into modules, e.g., user module, organization-structure module, etc. Each module has DAO, domain, validation, and service packages
- Spring dependecy injection
- Slick FRM for DB connection
- Akka Actors for ActionLog
- Deep validation where all errors, warnings, and info messages are collected and presented
- All REST responses are unified with the same structure every time, so it's easier to handle errors, warnings, and messages as well as specific data on pages.
Responses are structured for global and local messages. Local messages are coupled to some field, e.g., "Username is too long. Allowed length is 80 chars." Global messages are messages that reflect all data on page, e.g., "User will not be active untill is approved." Messages have three levels: ERROR, WARNING and INFORMATION.
(example response: http://demo3385913.mockable.io/api/v1/single-create-response)
- JSON Web Tokens (JWT) for user identification and authentication
- Divided into modules, e.g., user module, organization-structure module, etc. Each module has DAO, domain, validation, and service packages
- Spring dependecy injection
Chess Problem
https://github.com/git-josip/chess-problem-josipThe problem is to find all unique configurations of a set of normal chess pieces on a chess board with dimensions M×N where none of the pieces is in a position to take any of the others. Assume the colour of the piece does not matter, and that there are no pawns among the pieces. Write a program which takes as input:
- The dimensions of the board: M, N.
- The number of pieces of each type (King, Queen, Bishop, Rook and Knight) to try and place on the board.
As output, the program should list all the unique configurations to the console for which all of the pieces can be placed on the board without threatening each other. When returning your solution, please provide with your answer the total number of unique configurations for a 7×7 board with 2 Kings, 2 Queens, 2 Bishops and 1 Knight.
- The dimensions of the board: M, N.
- The number of pieces of each type (King, Queen, Bishop, Rook and Knight) to try and place on the board.
As output, the program should list all the unique configurations to the console for which all of the pieces can be placed on the board without threatening each other. When returning your solution, please provide with your answer the total number of unique configurations for a 7×7 board with 2 Kings, 2 Queens, 2 Bishops and 1 Knight.
Red Bull Paper Wings 2009. Croatian Champion
National Champion of Croatia in the Red Bull Paper Wings contest in 2009 and participant in the Red Bull Paper Wings World Championships in Salzburg, Austria, where I took 43rd place.
Red Bull Paper Wings 2012. Croatian Champion
National Champion of Croatia in the Red Bull Paper Wings contest in 2012 and participant in the World Championships in Salzburg, Austria, where I took 20th place.
Skills
Languages
Scala, JavaScript, Java, C, Java 8, ECMAScript (ES6), Python
Frameworks
Spring Boot, Play Framework, Angular, Hibernate, Express.js, AngularJS, Spring
Libraries/APIs
Node.js, JasperReports, Underscore.js, jQuery
Paradigms
Kanban, Agile
Platforms
Linux, MacOS, Kubernetes, Docker, Amazon EC2, Apache Kafka
Storage
Elasticsearch, Memcached, MongoDB, PostgreSQL, Amazon S3 (AWS S3), Vertica, MySQL
Other
Startups, Software Engineering, CTO, Sprint Planning, RMI, Web MVC, Akamai, Poker
Tools
IntelliJ IDEA, WebStorm, Git, Jira, Vagrant, Mongoose, Amazon Simple Email Service (SES), RabbitMQ
Education
2003 - 2009
Master's Degree in Electrotechnic Engineering and Computer Science
University of Split - Split, Croatia