Location: Zaandam, North Holland, Netherlands Industry: Software Development GitHub: atscub LinkedIn: abraham-toledo Email: abrahamtoledo90@gmail.com Phone: +31 6 8407 2398
Senior Software Engineer @ Transferz | React, Nextjs, Nodejs, Python, ...
Seasoned software engineer with 13+ years of experience building scalable, user-focused solutions across diverse domains. For the past 8 years, I've specialized in full-stack development with a strong focus on modern frontend engineering—creating performant, responsive, and maintainable UIs that deliver exceptional user experiences.
I'm passionate about raising the bar in engineering culture: mentoring junior and mid-level developers, promoting best practices, and ensuring code quality, resilience, and scalability from day one. Thanks to my full-stack background, I excel at bridging frontend and backend teams, translating business goals into seamless end-to-end solutions.
Driven by curiosity and a commitment to excellence, I care not only about what works—but about building products and teams that thrive long term.
In a nutshell, I am an experienced Senior Software Engineer with over 13 years in software development, specializing in full-stack and frontend engineering for the past 8 years, but there is nothing I haven't played with at some point.
Proven track record of delivering scalable, user-centric solutions across various industries. Skilled in mentoring developers, promoting best practices, keeping tech debts in check, and bridging frontend-backend teams to translate business goals into seamless solutions.
Passionate about leveraging AI technologies throughout the whole engineering process, with a strong interest in multi-agent systems. Committed to building resilient products and fostering thriving engineering cultures.
13 years building software. 8 years specializing in frontend and full-stack. I've touched most things in between—mobile apps, distributed systems, even building a hands-off email-to-web bridge in Cuba when internet was scarce. Open source contributor with 41 stars on a Python library I maintain.
I mentor developers, push for clean code and sustainable practices, and bridge the gap between frontend, backend, and business needs. Recently exploring how AI and multi-agent systems can reshape how we build software.
I care about what works and what lasts.
Python library · 41 stars github.com/atscub/nautapy
A Python client for interacting with Cuba's Nauta internet service. Built to solve a real problem for Cuban users managing their internet accounts—checking balance, viewing usage history, and handling connections programmatically. The library abstracts away the complexity of the Nauta portal's authentication and session management, making it simple for developers to integrate these features into their own tools and applications.
Transferz · Full-time Sep 2023 - Present · 2 yrs 2 mos Amsterdam, North Holland, Netherlands · On-site
As Senior Frontend Engineer in a Scrum team, I play a key role in driving technical solutions and shaping product experiences. I collaborate closely with our Product Owner and Designer to balance innovation with delivery capacity, ensuring we build intuitive and scalable user experiences. Leveraging my full-stack background, I often bridge the gap between frontend and backend teams, enabling smooth end-to-end integrations. I also mentor junior and mid-level engineers, fostering growth and best practices across the team.
Some achievements & contributions:
- Performance optimization: Reduced LCP times on our legacy POS (CRA-4) through deep performance tuning and low-level web optimizations.
- Modernization: Guided and supported a junior developer in migrating a project from CRA-4 to Vite.
- Feature delivery: Designed and implemented driver tipping functionality in our traveller app.
- Engineering culture: Established coding standards, testing guidelines, and process improvements within Scrum.
- DevOps excellence: Maintained and enhanced CI/CD pipelines to ensure reliability and fast delivery.
- Architecture & delivery: Co-designed and implemented a new backoffice portal for a partner using a modern tech stack (Vite, React, Tailwind, SWR, TanStack Table).
- Innovation: Regularly explore and integrate AI-assisted coding practices to boost team productivity and code quality.
Skills: Web Application Development · React.js · Apollo GraphQL · Tailwind CSS · CoreUI
BOTS · Full-time Oct 2022 - Jun 2023 · 9 mos Haarlem, North Holland, Netherlands
As the tech lead for the business operations infrastructure team, I'm responsible for guiding the team towards achieving the common goals of the organization. Communication with other teams, and non technical stake holders is essential. Therefor, I also act as a bridge making sure business requirements are propperly and efficiently translated into technical roadmaps for implementation. Ensuring good communication and careful listening as they are key for the role.
Skills: Hypertext Transfer Protocol (HTTP) · TypeScript
BOTS · Full-time Mar 2022 - Sep 2022 · 7 mos Haarlem, North Holland, Netherlands
Together with my team, we were responsible for developing and maintaining the infrastructure for business operations across the company. Integrating the central platform with several internal and external APIs and No SQL databases. Enabling operations and business insight for employees of the organization.
Skills: Hypertext Transfer Protocol (HTTP) · TypeScript
Fonoma · Full-time Oct 2019 - Jan 2022 · 2 yrs 4 mos
My team and I were responsible for the Development and DevOps for the Mobile Application part of the product. Extreme attention to detail and nuances was key to develop the best user experience and ensure the highest retention possible. Worked along with very seasoned UI/UX designers, and tech leads from whom I was able to absorb a lot of knowledge from and experience.
Skills: Hypertext Transfer Protocol (HTTP) · TypeScript · React.js
EOS Code · Part-time Sep 2020 - Aug 2021 · 1 yr Remote
- Develop the entire life cycle of mobile applications.
- Develop and deploy ODOO integrations with third party APIs like Shopify and Google Cloud Storage.
Skills: Hypertext Transfer Protocol (HTTP) · TypeScript · React.js
Aurora Suite · Self-employed Mar 2012 - May 2019 · 7 yrs 3 mos Havana, Cuba
Develop a platform to allow seamless access to the world wide web on mobile devices with email-only service. The platform was useful and very popular in Cuba (up to 5k monthly active users) due to the lack of mobile data plans.
- Develop a distributed PHP-based backend that served as a bridge between SMTP protocol and HTTP protocol.
- Develop an Android application with Java that served as a bridge between the users personal email account and the web browser.
Skills: Hypertext Transfer Protocol (HTTP)
Universidad Tecnólogica de La Habana "Jose Antonio Echeverría", CUJAE · Full-time Sep 2016 - Sep 2018 · 2 yrs 1 mo Havana, Cuba
Teach Calculus and Numerical Mathematics.
EFSET English Certificate 83/100 (C2 Proficient) EF SET Issued Jul 2021
- React.js (LinkedIn Assessment ✓)
- TypeScript
- JavaScript (LinkedIn Assessment ✓)
- Next.js
- Tailwind CSS
- Apollo GraphQL
- CoreUI
- HTML5 / CSS3 (LinkedIn Assessment ✓)
- SASS
- Vite
- Performance Optimization
- Angular (LinkedIn Assessment ✓)
- Node.js (LinkedIn Assessment ✓)
- Python (LinkedIn Assessment ✓)
- Django (LinkedIn Assessment ✓)
- Flask
- REST APIs (LinkedIn Assessment ✓)
- GraphQL
- PHP (LinkedIn Assessment ✓)
- PostgreSQL
- MySQL (LinkedIn Assessment ✓)
- NoSQL
- Android Development (LinkedIn Assessment ✓)
- React Native
- Ionic Framework
- Java (LinkedIn Assessment ✓)
- Git (LinkedIn Assessment ✓)
- CI/CD
- Bash (LinkedIn Assessment ✓)
- Docker
- Web Application Development
- Full-Stack Development
- Mentoring & Leadership
- Agile/Scrum
- OOP (LinkedIn Assessment ✓)