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João Fernandes Email & Phone Number

Senior web developer at Railsware
Location: Portugal, Portugal, Portugal 10 work roles 2 schools
1 work email found @toptal.com LinkedIn matched
✓ Verified May 2026 4 data sources Profile completeness 100%

Contact Signals · 1 work email

Work email j****@toptal.com
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Current company
Railsware
Role
Senior web developer
Location
Portugal, Portugal, Portugal
Company size
90 employees

Who is João Fernandes? Overview

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Quick answer

João Fernandes is listed as Senior web developer at Railsware, a company with 90 employees, based in Portugal, Portugal, Portugal. AeroLeads shows a work email signal at toptal.com and a matched LinkedIn profile for João Fernandes.

João Fernandes previously worked as Senior Software Engineer at Railsware and Freelance Web Developer at Toptal. João Fernandes holds Master Of Science (M.Sc.), Computer Software Engineering, 16 Out Of 20 from Faculdade De Engenharia Da Universidade Do Porto / Feup.

Company email context

Email format at Railsware

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{first_initial}{last}@toptal.com
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Profile bio

About João Fernandes

As a Freelance Web Developer, I have delivered high-quality, scalable, and secure solutions for various clients, using Ruby on Rails and other technologies. I have over 7 years of experience in web development, working at startups, large companies, and as an individual contractor.My core competencies include API design and integration, performance optimization, testing, and continuous delivery. I have also contributed to improving the developer experience, resolving memory issues, introducing encryption, and implementing two factor authentication. I enjoy working in small teams and mentoring others.

Listed skills include Cucumber, .Net, Binary Tree, Distributed Systems, and 35 others.

Current workplace

João Fernandes's current company

Company context helps verify the profile and gives searchers a useful next step.

Railsware
Railsware
Senior web developer
kraków, lesser poland voivodeship, poland
Website
railsware.com
Employees
90
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10 roles

João Fernandes work experience

A career timeline built from the work history available for this profile.

Senior Software Engineer

Current
Railsware
Oct 2023 - Present

Freelance Web Developer

Current
Toptal
Jan 2020 - Present

Senior Software Engineer

Quaderno

At Quaderno I improve our developer experience, and our public API. I also build features and fix bugs related to its integrations with external APIs.Highlights include:- Reduced test build time by 50%.- Diagnosed and resolved memory issues which caused CI builds and deploys to become stuck.- Introduced integration tests with Capybara and Selenium..

Oct 2020 - Mar 2022

Senior Software Engineer

Fetlife

Worked as a remote contractor for a fully remote team developing a social network with over 8 million members and 6 billion monthly requests.Highlights include:- Integrated the site's reporting functionality with Help Scout- Expanding the functionality of a user blocking another one to be reflected in all areas of the website, including comments on content.

Jan 2020 - Oct 2020

Freelance Developer

Arc.Dev

Work remotely on part time projects alongside my full time job:- Built a testimonial page for the Alto Pharmacy landing site, in collaboration with the design agency Saint Friend- Worked on an app to connect Shopify accounting with QuickBooks

Sep 2019 - Feb 2020

Senior Software Engineer

Xing

Barcelona Area, Spain

Did full stack development on the platform's recruiter tools.Highlights include:- Implemented image and video updates for company profiles- Implemented GDPR compliance on B2B services- Migrated services from Ruby on Rails 4.2 to 5.2- Introduced a test driven culture in the frontend code- Improved error logging with Sentry- Mentored junior developers.

Nov 2017 - Dec 2019

Senior Software Engineer

Novicap

Barcelona Area, Spain

Helped migrate an existing double entry accounting system to a more flexible one. This involved writing the new system, porting existing code that depended on the old one, and migrating the existing records with minimal downtime.Technologies used:Ruby on RailsRSpecPostgreSQLAWSGit

Jun 2017 - Oct 2017

Software Engineer

Seedrs

Lisbon Area, Portugal / London Area, United Kingdom

Full-stack Ruby on Rails development in an agile environment. Responsible for development, infrastructure and testing of the Seedrs platform.Technologies used:Ruby on RailsSASSCucumberRSpecJavascriptEmber.jsGit

Aug 2014 - Dec 2016

Master Thesis Student

Glintt

Development of a framework for the development of web interfaces that are ready to be used with the Microsoft Kinect. Technology includes Javascript with JQuery, HTML, CSS and C#.

Feb 2014 - Jul 2014
Team & coworkers

Colleagues at Railsware

Other employees you can reach at railsware.com. View company contacts for 90 employees →

IP Ihor Prokopenko Ihor Prokopenko Colleague at Railsware Lviv, Ukraine, Ukraine View → SS Stanislav Shchedrolosyev Stanislav Shchedrolosyev Colleague at Railsware Ukraine, Ukraine View → VP Vladyslava Pertsatii Vladyslava Pertsatii Colleague at Railsware Poland, Poland View → NS Nadiia Stelmakh Nadiia Stelmakh Colleague at Railsware Ukraine, Ukraine View → AR Andrei Razhkouski Andrei Razhkouski Colleague at Railsware Póvoa De Varzim, Porto, Portugal, Portugal View → IK Iwona Kaźmierczak Iwona Kaźmierczak Colleague at Railsware Warsaw, Mazowieckie, Poland, Poland View → AY Anatoliy Yevpack Anatoliy Yevpack Colleague at Railsware Ukraine, Ukraine View → BB Belma Balic Cinco Belma Balic Cinco Colleague at Railsware Mostar, Federation Of Bosnia And Herzegovina, Bosnia And Herzegovina, Bosnia And Herzegovina View → SS Stas Sokolov Stas Sokolov Colleague at Railsware Kyiv, Kyiv City, Ukraine, Ukraine View → OT Olha Tsyperdiuk Olha Tsyperdiuk Colleague at Railsware Ukraine, Ukraine View →
2 education records

João Fernandes education

Informatics

Sapienza Università Di Roma

Erasmus student for one semester. Had classes of Wireless Systems, Network Algorithms, Multimodal Interaction and Advanced Software.

FAQ

Frequently asked questions about João Fernandes

Quick answers generated from the profile data available on this page.

What company does João Fernandes work for?

João Fernandes works for Railsware.

What is João Fernandes's role at Railsware?

João Fernandes is listed as Senior web developer at Railsware.

What is João Fernandes's email address?

AeroLeads has found 1 work email signal at @toptal.com for João Fernandes at Railsware.

Where is João Fernandes based?

João Fernandes is based in Portugal, Portugal, Portugal while working with Railsware.

What companies has João Fernandes worked for?

João Fernandes has worked for Railsware, Toptal, Quaderno, Fetlife, and Arc.Dev.

Who are João Fernandes's colleagues at Railsware?

João Fernandes's colleagues at Railsware include Ihor Prokopenko, Stanislav Shchedrolosyev, Vladyslava Pertsatii, Nadiia Stelmakh, and Andrei Razhkouski.

How can I contact João Fernandes?

You can use AeroLeads to view verified contact signals for João Fernandes at Railsware, including work email, phone, and LinkedIn data when available.

What schools did João Fernandes attend?

João Fernandes holds Master Of Science (M.Sc.), Computer Software Engineering, 16 Out Of 20 from Faculdade De Engenharia Da Universidade Do Porto / Feup.

What skills is João Fernandes known for?

João Fernandes is listed with skills including Cucumber, .Net, Binary Tree, Distributed Systems, Git, Linux, Jquery, and Class.

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