Daniel Isac, Developer in Iași, Iași County, Romania
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Daniel Isac

Verified Expert  in Engineering

Software Developer

Iași, Iași County, Romania
Toptal Member Since
September 21, 2020

Daniel is an entrepreneur with seven years of experience and a strong focus on CRM systems. He founded a company delivering world-class solutions for businesses in the rail, transportation, health, music, and HR sectors. Daniel developed complex shipping and payment API integrations and is always eager to learn and adapt to innovative technologies.


Freelance for Alliansen AS
SMS Gateways, CRM APIs, MySQL, SCSS, JavaScript, React Redux, React, PHP...
SC Cross Techit SRL
React, JavaScript, PHP, Laravel, Lumen, APIs, Blockchain, Solidity
Freelance for Crossworlder Music, Ltd.
Flashphoner, Music Streaming, Redux, JavaScript, React, PHP, Laravel, REST APIs...




Preferred Environment

JavaScript, PHP, Laravel, React, Slack, Visual Studio Code (VS Code), Jira, Lumen, MacOS, APIs

The most amazing...

...project I developed was a complex API integration with a big shipping company.

Work Experience

Full-stack Developer

2020 - PRESENT
Freelance for Alliansen AS
  • Developed a web-based CRM system from scratch for a social workforce recruitment company.
  • Designed the database and architected the web application.
  • Implemented a REST API using Laravel, which communicates with the front end developed in React.
  • Organized work into sprints and delivered detailed estimates.
  • Assisted the client in prioritizing tasks based on need.
  • Implemented a complex charge rate system and financial reports.
Technologies: SMS Gateways, CRM APIs, MySQL, SCSS, JavaScript, React Redux, React, PHP, Laravel, APIs, REST APIs

Full-stack Developer

2015 - PRESENT
SC Cross Techit SRL
  • Developed a complex API integration with a world-class shipping company.
  • Delivered over 30 projects and improved estimations accuracy, deadlines, costs, task prioritization, and impact levels.
  • Developed a CRM system for MOT vehicle technical inspection. Created a CSV import system with data mapping.
  • Developed an appointment management system for a medical clinic. The system has Android, iOS, and web apps used by doctors, clients, and secretaries.
  • Implemented projects using various technologies, which solidified and expanded my knowledge of software architecture.
  • Collaborated with designers and translated designs into code.
  • Managed a small team of five people in projects. This implied communication with clients, salespersons, designers, hardware, and software engineers.
  • Served in many startup environments and better understood how to efficiently deliver value within a business.
  • Offered consulting sessions regarding software architecture or technology stacks for new starting projects.
Technologies: React, JavaScript, PHP, Laravel, Lumen, APIs, Blockchain, Solidity

Full-stack Developer

2013 - PRESENT
Freelance for Crossworlder Music, Ltd.
  • Developed from scratch a Laravel and React-based project that implements a music recommendation system based on a variety of factors. For example, a "moment of the day" playlist could be programmed and then would stream music into business locations and also foster a DJ-like community.
  • Created a blockchain-based download system where end-users could pay per download directly to another user's account. For this, I developed a smart contract on the Ethereum network.
  • Implemented a video re-stream server using Flashphoner.
  • Built an automation system to crawl new songs from other music services APIs.
  • Oversaw the project going into production and got feedback from business owners streaming music from within the app.
Technologies: Flashphoner, Music Streaming, Redux, JavaScript, React, PHP, Laravel, REST APIs, Android

Full-stack Developer

2019 - 2020
Freelance for Skillo, Ltd.
  • Developed new features for a CRM system for a workforce recruitment company in the rail and construction sector.
  • Improved the existing project architecture and implemented a new authentication system.
  • Architected and developed a React project from scratch for a new user role.
  • Designed and built an Android application that acts as an SMS gateway. Integrated it into the existing CRM.
Technologies: SMS Gateways, Android, MySQL, jQuery, JavaScript, React, Groovy, Java, Jira

CRM for Alliansen NO

A recruitment company uses this CRM system to connect employees with companies seeking a workforce.

I was a full-stack developer for this project and created a REST API using Laravel and the web app using React. I integrated a live messaging system using Pusher and implemented an SMS gateway for sending different kinds of notifications. The CRM was used by multi-million dollar companies.

Music Browsing and Streaming App for Personal Streamer

An Android and web-based music streaming app. The project's goals were to improve its musical brand by connecting them with the right DJs who offered copyright-free music.

I worked as a full-stack developer on this project and implemented a Laravel REST API, a React web app, a recommendation system based on Stamina, and a "moment of the day" and gamma of the song. I created a blockchain-based download system where end users could pay per download directly to another user's account. For this, I developed a Smart Contract on the Ethereum network. The video streaming server re-streams through the web app.

CRM System for MOT Services

A web-based application for MOT services with the main purpose to send reminders to businesses clients about the expiration date of their technical inspection. I was the full-stack developer on this project.

I created a CSV import system with data mapping and interpretation. Set up and connected the system with Raspberry Pi containing a GSM Sim card. This is used for sending SMS reminders to clients.
2017 - 2019

Master's Degree in Real Estate Entrepreneurship

Gheorghe Asachi Technical University - Iasi, Romania

2013 - 2017

Engineer's Degree in Computer Science

Gheorghe Asachi Technical University - Iasi, Romania


Cisco Certified Network Associate Routing & Switching (CCNA)

Cisco, Inc.


REST APIs, React, Pusher, React Redux, FFmpeg, jQuery


Jira, Firebase Authentication


Laravel, React Native, Flutter, Redux, Lumen


MySQL, Cloud Firestore


PHP, JavaScript, HTML, CSS, Solidity, TypeScript, Java, Kotlin, C++, Assembly, SCSS, Dart, Swift, Groovy


Android, Linux, iOS, Raspberry Pi, Blockchain, Firebase, Music Streaming, MacOS


Object-oriented Programming (OOP)


SMS Gateways, Smart Contracts, Machine Learning, Web Development, Networking, Real Estate, Branding, Cisco Networking, IT Networking, Flashphoner, Smart Homes, Music, Google Cloud Functions, APIs, CRM APIs

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