Christos Paschalidis, Developer in Mexico City, Mexico
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Christos Paschalidis

Verified Expert  in Engineering

Front-end Developer

Location
Mexico City, Mexico
Toptal Member Since
October 25, 2022

Christos is a computer science graduate with over eight years of experience in full-stack and DevOps. In the projects he has led, he took ideas from conception to planning, implementation, testing, and final release. His focus lies in fostering an environment where peers can learn from each other, mentor each other and enjoy their best work.

Portfolio

Sesame Care
TypeScript 3, Terraform, Contentful, Cypress, Docker...
Freelancer @ ReDI School of Digital Integration
Azure, Docker, Terraform, Open Source, TypeScript, HTML, Storybook, Figma, CSS...
Dhis2
TypeScript 3, RxJS, React, Cypress, Docker, Open Source, TypeScript, HTML...

Experience

Availability

Part-time

Preferred Environment

React, Next.js, Cypress, Docker, Kubernetes, Terraform, Google Cloud Platform (GCP), Azure, TypeScript, Node.js

The most amazing...

...work I've done was for America's #1 telehealth company in 2022. We all shared our expertise and built an impactful end product. (https://sesamecare.com)

Work Experience

Senior Software Engineer

2021 - 2023
Sesame Care
  • Led our in-house security guild for three months, focusing on fortifying the web app's security.
  • Crafted and wrote technical specifications for the team while communicating deliveries and issues successfully to senior engineers and stakeholders.
  • Played a vital role in guiding junior engineers, providing support in feature delivery, and offering training on daily processes and systems.
  • Worked on increasing the website's SEO ranking, which improved the overall visibility of the product.
  • Worked on implementing monthly or yearly subscriptions and payments through Stripe, which improved our product's overall traction.
  • Developed compelling user-facing features, thoughtfully A/B tested to ensure exceptional user experiences.
  • Enabled insights into teams' performance through tools like Grafana and Prometheus.
  • Streamlined CI/CD pipelines and reduced deployment time, enabling bugs and releases to be live 40% faster.
  • Incorporated new infrastructure skillfully into the platform using Terraform and Google Cloud Platform (GCP), leveraging the latest technology to enhance performance and scalability.
Technologies: TypeScript 3, Terraform, Contentful, Cypress, Docker, Google Cloud Platform (GCP), Next.js, React, TypeScript, HTML, Storybook, Figma, CSS, GraphQL, A/B Testing, E2E Testing, JavaScript Testing, Create React App, Tailwind CSS, Front-end, Apollo, Jest, Node.js, PostgreSQL, Vercel, User Interface (UI), User Experience (UX), GitHub, CI/CD Pipelines, Amazon Web Services (AWS), HTML5, DOM, ECMAScript (ES6), Google SEO, SEO Tools

DevOps Engineer

2021 - 2022
Freelancer @ ReDI School of Digital Integration
  • Migrated all existing infrastructure expertly from AWS to Azure, ensuring a smooth transition for both back-end and front-end applications.
  • Led the implementation of CI/CD pipelines for existing and greenfield projects, harnessing the power of GitHub Actions and Azure.
  • Leveraged Terraform and managed the infrastructure of both back-end and front-end environments enabling efficient and scalable deployments.
Technologies: Azure, Docker, Terraform, Open Source, TypeScript, HTML, Storybook, Figma, CSS, A/B Testing, Front-end, PostgreSQL, Vercel, GitHub, CI/CD Pipelines, Amazon Web Services (AWS), HTML5, DOM

Senior Software Engineer

2020 - 2021
Dhis2
  • Wrote technical specifications for the team, ensuring deadlines and deliveries were communicated with product owners.
  • Introduced end-to-end testing suites using Cypress for the front end. Automated tests for more than 35% of all the features.
  • Guided and supported junior engineers, assisting in feature delivery and offering valuable training on daily processes and systems.
  • Improved CI/CD infrastructure significantly and reduced Docker image sizes, resulting in faster and more reliable deployment times.
Technologies: TypeScript 3, RxJS, React, Cypress, Docker, Open Source, TypeScript, HTML, Storybook, Figma, CSS, A/B Testing, E2E Testing, JavaScript Testing, Create React App, Front-end, Jest, Recharts, Node.js, Vercel, User Interface (UI), User Experience (UX), GitHub, CI/CD Pipelines, Amazon Web Services (AWS), HTML5, DOM, ECMAScript (ES6), MongoDB

Senior Software Engineer

2019 - 2020
Freelancer @ Spiced academy
  • Integrated Recharts into the Next.js e-learning platform, providing insightful visualizations of student performance.
  • Led the development of interactive charts, empowering educators to track student progress in real-time and identify areas for improvement.
  • Coordinated the implementation of a responsive design overhaul, ensuring the e-learning platform's seamless usability across various devices, enhancing accessibility and user satisfaction.
  • Integrated cutting-edge authentication and security features into the platform, bolstering data privacy and safeguarding sensitive user information.
Technologies: React, TypeScript 3, Recharts, Node.js, User Interface (UI), User Experience (UX), GitHub, CI/CD Pipelines, HTML5, DOM, ECMAScript (ES6)

Software Engineer

2018 - 2020
Employed @ Vivy
  • Participated in the hiring and onboarding process of new software engineers, playing a crucial role in expanding the team.
  • Guided junior engineers, ensuring successful feature delivery and offering training on daily processes and systems.
  • Made open-source the out in-house design system and the Cryptographic libraries, which ensured visibility and improved overall public trust in the product.
  • Set up the infrastructure of CI/CD pipelines using Jenkins and CircleCI, streamlined development and deployment processes, and increased efficiency.
Technologies: TypeScript 3, React, Next.js, RxJS, Cypress, Open Source, TypeScript, HTML, Storybook, Figma, CSS, A/B Testing, E2E Testing, JavaScript Testing, Create React App, Front-end, Jest, Full-stack, User Interface (UI), User Experience (UX), CI/CD Pipelines, HTML5, DOM, ECMAScript (ES6), Google SEO, SEO Tools

Software Engineer

2016 - 2018
Employed @ Vimcar
  • Led the successful relaunch of Vimcar's website and skillfully implemented large features in collaboration with product designers, managers, and fellow engineers, delivering a compelling user-facing product.
  • Implemented search engine optimization successfully and developed a performance-focused web application using Next.js and Contentful, enhancing user experience and visibility.
  • Established the CI/CD infrastructure using Docker and Jenkins under the guidance of a development lead, streamlining development and deployment processes.
Technologies: JavaScript, JavaScript Testing, Next.js, SEO Content, Contentful, HTML, Figma, CSS, A/B Testing, Create React App, Front-end, Jest, Charts, Full-stack, User Interface (UI), User Experience (UX), CI/CD Pipelines, HTML5, DOM, ECMAScript (ES6), Google SEO, SEO Tools

Junior Engineer

2015 - 2016
Intern @ Factor-E Analytics
  • Optimized the front-end application's performance successfully, working closely with the development lead to achieve impressive results.
  • Implemented D3.js graphs skillfully on the platform, providing managers with clear and insightful shop floor key performance indicators (KPIs).
  • Developed and enhanced the existing real-time notification system of the front-end application, ensuring seamless and timely updates for users.
Technologies: JavaScript, JavaScript Testing, HTML, CSS, Create React App, Charts, HTML5, DOM, ECMAScript (ES6)

Worked at America's #1 Telehealth Company

http://sesamecare.com/
As a software developer at America's #1 Telehealth Company, as ranked in 2022, I had the chance to be involved in a variety of projects.

In this role, my security background led me to lead our in-house security guild for three months, focusing on fortifying the web app's defenses and best security practices.

Effective communication with senior engineers and stakeholders fostered a collaborative environment where seamless feature development occurred with security as a priority. Colleagues commended this skill.

Working closely with junior engineers was rewarding. I provided guidance, helping them navigate technical challenges and understand ticket requirements.

As a team, we prioritized optimizing user experiences, introducing compelling features, and conducting meticulous A/B testing. This focus resulted in heightened engagement and positive feedback from users.

Noteworthy projects included:
• improving overall SEO ranking of the website.
• enabling data-driven decisions through tools like Grafana and Prometheus.
• obtaining valuable KPIs for evaluating team performance.
• streamlining CI/CD pipelines, reducing deployment time.
• incorporating new infrastructure with Terraform and GCP, bolstering performance and scalability.

Worked on Germany's #1 E2E Encrypted Health Information System

https://www.vivy.com/
As a software engineer at Germany's #1 E2E encrypted Health Information, we delivered a secure and usable digital health platform with user security in mind.

I have been a front-end developer since the product's early days, which led me to hire and mentor new members. I was also an active contributor to the internal security team and assisted with implementing multiple features on the platform.

Worked on the world's largest health information management system

https://github.com/dhis2/capture-app
As a senior software developer at DHIS2, I have diligently crafted specifications for new projects in close collaboration with product designers and managers. Effective communication has been first in my mind, successfully communicating timelines and addressing issues with peers and stakeholders.

I take pride in guiding and supporting junior engineers, assisting in feature delivery, and offering valuable training on daily processes and systems. In this regard, a few of my contributions extend to pair programming with other engineers, engaging in detailed code reviews, and helping them navigate their role requirements.

I introduced E2E testing using Cypress, and we covered over 35% of the already introduced features. This has left developers and stakeholders with a more peaceful night's sleep.

Moreover, I have been instrumental in enhancing our CI/CD infrastructure and reducing Docker image sizes, leading to faster and more reliable deployment times. This optimization has resulted in a more efficient and robust development environment.

Migration of Existing Infrastructure From AWS to Azure Cloud

https://connect.berlin.redi-school.org/front/home
As a DevOps engineer at ReDi School, a nonprofit tech school, I took charge of vital infrastructure projects which impacted the platform's performance and scalability.

Noteworthy projects included migrating all existing infrastructure from AWS to Azure and improving performance.

I had the opportunity to lead the implementation of CI/CD pipelines for existing and greenfield projects, harnessing the power of GitHub Actions and Azure.

Lastly, we leveraged Terraform, which helped us manage the infrastructure of both back-end and front-end environments.

Relaunched Greenfield Brand Website for Vimcar

https://vimcar.de/
As part of my role at Vimcar, I had the chance to lead the implementation and relaunch of their new website branding.

I implemented a modern solution using Next.js and Contentful, which focused on the website's SEO ranking.

Product Managers' Toolbox

http://www.pm.tools
The Product Managers' Toolbox is a simple app where PMs can search for different techniques and methods they can use within their teams.

I developed this toolbox independently, implementing the web application and its continuous delivery.

Languages

TypeScript 3, JavaScript, CSS, TypeScript, HTML, HTML5, ECMAScript (ES6), GraphQL

Frameworks

Next.js, Cypress, Jest, Tailwind CSS, NestJS, React Native

Libraries/APIs

React, RxJS, Node.js, Recharts

Tools

Create React App, JavaScript Testing, Figma, GitHub, Terraform

Paradigms

E2E Testing

Platforms

Contentful, Docker, Azure, Amazon Web Services (AWS), Kubernetes, Google Cloud Platform (GCP)

Other

Open Source, Storybook, Front-end, Charts, User Interface (UI), User Experience (UX), CI/CD Pipelines, DOM, Google SEO, SEO Tools, SEO Content, A/B Testing, Apollo, MERN Stack, Vercel, Full-stack, Computer Science

Storage

PostgreSQL, MongoDB

2010 - 2015

Master's Degree in Computer Science

Department of Computer Engineering and Informatics, University of Patras - Patras, Greece

AUGUST 2023 - PRESENT

NestJS

Udemy