Hire Me

Highly Experienced Ruby on Rails Software Engineer

Available to Build/Scale/Architect

Your Dream Application To Reach Millions of Global Users

In 2024, On all platforms



(Success Stories)


2023 - Company acquired by Threecolts

ScoutIQ is a robust application designed specifically for Amazon sellers, particularly those involved in selling books. It offers a suite of features that help users efficiently scout, list, and sell products on Amazon, leveraging data to make informed purchasing decisions.

The eScore feature tracks the number of days a book has sold over the past six months, providing a reliable measure of its sellability. This complements the sales rank, which indicates how recently a book has sold, helping sellers assess its market demand.

Users can set predefined criteria (triggers) to quickly determine whether a book is worth purchasing. When a book meets these criteria, the app displays a green "accept" bar, and a red "reject" bar if it doesn't, streamlining the decision-making process.

ScoutIQ offers both live and database scanning options. Live scanning requires an internet connection and provides the most up-to-date data, while the downloadable database allows for faster scanning without internet access, ideal for areas with poor connectivity.

The app provides detailed profit calculations, accounting for Amazon fees and shipping costs, ensuring sellers can make informed decisions about potential profits. It also integrates trade-in values, allowing users to sell books directly to wholesalers like Sell Your Book Back.

ScoutIQ is praised for its simple and intuitive interface, making it accessible for both new and experienced sellers. The app supports features like barcode scanning with a smartphone camera and connects to external scanners for high-volume users. Additionally, it offers robust customer support and a vibrant community of users for assistance and advice.

The app has a thriving community with over 20,000 active members sharing tips and success stories. Many users have built successful Amazon businesses using ScoutIQ, with some transitioning to full-time selling after starting part-time. This community aspect adds significant value, providing users with insights and motivation from peers.

ScoutIQ is an essential tool for Amazon book sellers, offering features that simplify scouting, enhance profitability, and support business growth. With its combination of real-time and offline data, smart triggers, and a supportive community, ScoutIQ empowers sellers to make data-driven decisions and achieve success on Amazon.


2020 - The Leading Construction Management App Valuated At 9.65 Billions

Is the largest app for construction project management, designed to streamline various aspects of construction projects from planning through completion. It offers comprehensive tools for project management, document control, financial management, quality and safety, and more, making it an essential platform for construction professionals.

Procore offers robust project management capabilities including tools for managing RFIs (Requests for Information), submittals, change orders, punch lists, and daily logs. This ensures that all project-related information is centralized and easily accessible, facilitating better coordination among project stakeholders.

The software provides advanced document management features that allow users to store, organize, and share documents efficiently. This includes automated document sharing and photo archiving, ensuring that all project documents are up-to-date and readily available.

Procore includes comprehensive financial tools to manage budgets, track costs, and handle invoices and payments. Integration with popular accounting software like QuickBooks, Sage 300 CRE, and Viewpoint further streamlines financial management processes.

Procore's mobile app allows users to access project information on the go, ensuring continuous productivity regardless of location. The app supports both Android and iOS devices and offers offline capabilities, making it ideal for fieldwork where internet access might be limited.

The platform enhances collaboration through its communication tools, which include real-time messaging, email integration, and customizable notifications. This helps keep all team members informed and aligned on project progress and updates.

Procore includes modules specifically designed for quality assurance and safety management, helping to ensure compliance with industry standards and regulations. This includes tracking inspections, incidents, and corrective actions to maintain high standards of project execution.


2016 - Skupos Raises $2.41m in Seed Funding

An application designed to enhance the profitability and efficiency of convenience stores by connecting them with brands and distributors on a unified platform. Here's a detailed overview of its functionalities and features.

Skupos allows retailers to earn additional revenue through tobacco scan data programs. By participating in these programs, stores can offer multi-item discounts and other promotions directly at checkout, which can help boost sales and customer engagement.

This platform enables convenience stores to access brand-funded promotions and rebate programs. These promotions are exclusively available through Skupos and do not impact the store's gross margins, providing an opportunity to increase revenue without additional costs.

For enterprise brands, Skupos offers detailed insights into product performance, market share, and consumer behavior. These insights are derived from real-time data collected across their network of over 15,000 independent convenience stores. Brands can use this information to create targeted promotions and understand their market better.

The Skupos Sync application ensures that stores can stay connected and submit scan data efficiently. It supports various point-of-sale systems and offers troubleshooting guides to keep the system running smoothly.

Skupos tracks a significant volume of transactions daily, helping stores and brands monitor sales and revenue effectively. This data helps in making informed decisions about inventory and promotions.


2014 - Top Startups in Germany

Is an all-in-one platform designed to streamline time tracking and absence management for small businesses.

The crewmeister pp allows employees to clock in and out using a smartphone, tablet, or desktop. The app supports real-time tracking and can operate offline, making it highly flexible for various work environments

Employees can log time against specific projects or clients, adding detailed notes if necessary. The GPS functionality ensures accurate location tracking, which is particularly useful for verifying work locations and preventing time theft.

The absence management module enables easy handling of vacation requests and approvals. Employers can view real-time data on employee availability, helping to avoid staffing shortages and ensuring smooth operations.

Crewmeister ensures compliance with legal requirements such as the German Minimum Wage Regulation. Data is securely stored in the cloud, with regular backups to prevent data loss and ensure availability for audits and payroll processing.

By offering a user-friendly and legally compliant solution, Crewmeister helps small businesses save time on administrative tasks and focus on their core activities.


C. Roth - Former CEO - ScoutIQ

- One man army ruby engineer

C. Winans - SSE - ScoutIQ

- Rockstar developer!

P. Ma - SSE - Analogue

- Great experience working with a great engineer as you!

J. Bolling - Founder of Skupos

- Without your expertise and dedication, Seb, our company wouldn't have achieved its success. Your engineering skills were pivotal to our growth and development.

S. Means - Lead Software Engineer - Procore

- What can I say, if your project is usin Rails, then you should definitely hire Sebastian. He's a great engineer and a great person to work with.

A. Crudu - Lead Software Engineer - Crewmeister

- This guy really knows his stuff. He's a great engineer and a great person to work with. I highly recommend him.

G. Harms - SSE - Procore

- Top notch ruby and react engineer.

M. Gandhi - Founder of Gradient Ascent

- One of the best engineers I've ever worked with. Highly professional and skilled.

C. Mucica - SSE - Nokia

- Sebastian is a great engineer and a great person to work with. I highly recommend him.

J. Campervans - Founder of Ourea

- Highly professional and skilled engineer without a doubt. I highly recommend him.

A. Duyzer - CTO - Gradient Ascent

- Sebastian is a pro ruby on rails engineer. Top!

L. Nguyen - CTO of Skupos

- MVP 🔝🔝🔝

About Me

I am a highly skilled software engineer based in London, UK, with expertise in a wide range of technologies. I am passionate about creating high-success and mission-critical applications that drive impactful results.

My motivation stems from a deep commitment to delivering exceptional quality and performance in every project I undertake. Whether it's building innovative startups from the ground up or scaling existing applications to meet the demands of millions of global users, I thrive on challenges and consistently strive for excellence.

Below are the key skills and tools I excel in:

Ruby on Rails React Ember PostgreSQL MongoDB Linux Android Development Web Development Web Scraping Automation Deployment Redis Team Management Git