Stanislav Saprankov, Developer in Kraków, Poland
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Stanislav Saprankov

Bio

Stanislav is a skilled front-end engineer proficient in building complex micro front ends with React and TypeScript. He has worked on high-traffic, high-stakes projects with millions of daily active users and billions of dollars in transactions. Additionally, he's experienced setting up CI/CD for complex SaaS solutions with AWS and Kubernetes. Stanislav's dedication to sharing his knowledge and experience with junior developers through mentoring is commendable.

Portfolio

CloudQuery
React, TypeScript, Next.js, Vercel, SQL
Revolut
APIs, React, TypeScript, RESTful Services, React Router...
Robert Langmach
JavaScript, Node.js, React, Full-stack, Amazon Web Services (AWS), Material UI...

Experience

  • JavaScript - 8 years
  • CSS - 8 years
  • REST - 7 years
  • Front-end - 6 years
  • TypeScript - 5 years
  • React - 5 years
  • Webpack - 4 years
  • Amazon Web Services (AWS) - 3 years

Preferred Environment

Visual Studio Code (VS Code)

The most amazing...

...project I've led and implemented was an AWS console for monitoring refund statistics for large AWS clients.

Work Experience

Senior Front-end Developer

2025 - PRESENT
CloudQuery
  • Built dynamic dashboards filled with widgets based on user-provided SQL queries.
  • Developed the SaaS platform for people willing to manage their cloud resources in one place.
  • Contributed to marketing improvements on the CloudQuery website and, among other things, boosted the consent box response rate by 40%.
Technologies: React, TypeScript, Next.js, Vercel, SQL

Senior Web Engineer

2023 - PRESENT
Revolut
  • Created a set of screens inside the Revolut Business UI, allowing merchants to control their locations and working hours.
  • Developed screens inside the Revolut Business UI where merchants can set up cashback rewards campaigns.
  • Redesigned a product management application acquired from a different company that displays statistics and allows users to manage iPad grids for their products.
Technologies: APIs, React, TypeScript, RESTful Services, React Router, Test-driven Development (TDD), ESLint, SQL, Cursor AI

Full-stack JavaScript Developer

2023 - 2023
Robert Langmach
  • Developed a website from scratch, including infra and back end, and launched it with 500 – 1,000 live users at the start.
  • Implemented, in a short period of time, features such as file upload and encryption of user data at rest for GDPR compliance.
  • Created a system to track user progress, including creating webhooks for 3rd-party services, tracking videos watched, documents uploaded, and quizzes completed.
Technologies: JavaScript, Node.js, React, Full-stack, Amazon Web Services (AWS), Material UI, Styled-components, Babel, RESTful Services, React Router, CSS Preprocessors, ESLint, SQL

Senior Front-end Engineer

2022 - 2023
Toptal
  • Shortened the deployment time of Collabshot over ten times by creating a CI/CD pipeline in GitHub Actions with deployment to GCP Kubernetes.
  • Shaped Collabshot to be a single-page application (SPA) using React, React Router, and TypeScript.
  • Mentored three interns, teaching them CSS3, JavaScript, React, TypeScript, and many ancillary technologies.
Technologies: TypeScript, React, JavaScript, CSS, Kubernetes, Terraform, WebSockets, REST, Jest, Storybook, Bash, Redux, Elasticsearch, Datadog, SCSS, Webpack, Front-end, Infrastructure as Code (IaC), HTML5, Full-stack, Web UI, HTML, Web UX, Next.js, Node.js, API Integration, Figma, Full-stack Development, Search Engine Optimization (SEO), Business Technology, REST APIs, APIs, Web Development, Git, Continuous Integration (CI), Material UI, Bitbucket, Google Cloud Platform (GCP), Styled-components, Babel, RESTful Services, React Router, CSS Preprocessors, Test-driven Development (TDD), ESLint

Front-end Engineer

2021 - 2022
Amazon Web Services (AWS)
  • Designed and built an entire console to review statistics of thousands of daily transactions using React, TypeScript, AWS SDK, DynamoDB, and AWS Lambda.
  • Improved the UX of AWS RAM Console by expanding its data model using React, Redux, and TypeScript in close collaboration with UX designers and the back-end team.
  • Automatized the deployment of over 20 internal packages by implementing a multi-stage CI/CD pipeline using TypeScript and AWS SDK.
Technologies: TypeScript, JavaScript, React, Amazon Web Services (AWS), Python, CSS, Sass, REST, Jest, Storybook, Bash, Redux, SCSS, Webpack, Front-end, Infrastructure as Code (IaC), HTML5, Web UI, HTML, Web UX, Node.js, API Integration, Databases, Figma, Discord, Full-stack Development, AWS Cloud Architecture, Business Technology, REST APIs, APIs, Web Development, Git, Continuous Integration (CI), Data Visualization, Babel, RESTful Services, React Router, ESLint

Senior Full-stack Engineer

2019 - 2021
FlixMobility GmbH
  • Developed the new Flixbus ticket using server-side rendering (SSR) and Serverless with React, TypeScript, AWS Lambda, and Amazon S3.
  • Developed the checkout and rebilling pages in React, TypeScript, Redux, and Recoil.
  • Saved multiple thousands of USD yearly by automating a mass update of promo codes using PHP Symfony.
  • Saved around $10,000 annually by migrating a SQL database with 600 million items to MongoDB.
  • Migrated Elasticsearch to AWS Managed Services (AMS), which reduced management costs for the DevOps team.
Technologies: React, PHP, Amazon Web Services (AWS), Symfony, Docker, Kubernetes, JavaScript, TypeScript, MongoDB, CSS, REST, Jest, Storybook, Server-side Rendering (SSR), Bash, Redux, Apache Kafka, Elasticsearch, Datadog, SCSS, Webpack, Front-end, Infrastructure as Code (IaC), HTML5, Full-stack, Web UI, HTML, Web UX, Next.js, Node.js, API Integration, Databases, Figma, Discord, Full-stack Development, AWS Cloud Architecture, Search Engine Optimization (SEO), Business Technology, REST APIs, APIs, Web Development, Git, Continuous Integration (CI), Data Visualization, Material UI, Firebase, Styled-components, Babel, RESTful Services, React Router, CSS Preprocessors, Test-driven Development (TDD), ESLint

Software Developer

2017 - 2019
Tradebyte Software GmbH
  • Improved the sales of certain items via Tradebyte's platform by 40% by enabling single articles for sale instead of just groups of them using JavaScript and JQuery.
  • Developed the new admin website using TypeScript and React.
  • Created complex, dynamic filters for specific users of the platform on demand.
Technologies: JavaScript, PHP, Docker, TypeScript, React, CSS, Symfony, REST, Jest, Bash, Vagrant, Webpack, Front-end, HTML5, Full-stack, Web UI, HTML, API Integration, Databases, Full-stack Development, Business Technology, REST APIs, APIs, Web Development, Git, Continuous Integration (CI), Data Visualization, RESTful Services, Test-driven Development (TDD), jQuery

Software Developer

2015 - 2017
Symanto
  • Developed a user interface for the support team to configure the web crawler using JavaScript and C#.
  • Created a web crawler to gather Instagram data used in market analysis using JavaScript and C#.
  • Built a client dashboard using JavaScript, Angular, and C#.
Technologies: C#, SQL, JavaScript, REST, CSS, HTML, Databases, Full-stack Development, Business Technology, Artificial Intelligence (AI), REST APIs, APIs, Web Development, Git, RESTful Services, jQuery

Experience

AWS Resource Access Management Console

https://aws.amazon.com/ram/?nc1=h_ls
AWS Resource Access Management (RAM) helps you securely share your resources across AWS accounts, within your organization or organizational units (OUs), and with IAM roles and users for supported resource types.

My achievement was implementing information about permission versions throughout the console. This information was not present on the front end. I collaborated closely with the designer and the back-end team to implement it in multiple pages and modal windows, keeping in mind complex edge cases and potential dependencies throughout the large codebase of the console.

New FlixBus Ticket

https://drive.google.com/file/d/1pKV7KUqQUCBVnljzEkABKF_xlGNKU6Z9/view?usp=sharing
The new ticket that millions of travelers use when they book a trip with FlixBus is rendered from React components using server-side rendering with the ReactDOM server. The process happens in an AWS Lambda function created and managed using the Serverless Framework. I participated in setting up the application's infrastructure and writing the actual components.

Application for Screenshot Sharing and Communication

https://www.collabshot.com/
I implemented an automated CI/CD pipeline that was previously not present in GitHub Actions. I made it a single-page application, removing multiple templates and rewriting them as React components instead. To comply with security standards and to prevent certain features from being deprecated, I upgraded all the dependencies, including major ones.

Web/Desktop App for Spawning Custom GPT Assistants

https://github.com/gpter-ai/gpter-ai
The app allows one to create and edit AI assistants in a few clicks. The app uses OpenAI API for querying the GPT model. The interface is similar to ChatGPT but much more user-friendly and does not require a browser.

Education

2014 - 2017

Bachelor's Degree in Business Informatics

Ansbach University of Applied Sciences - Ansbach, Germany

Certifications

JUNE 2021 - JUNE 2024

AWS Certified SysOps Administrator

Amazon Web Services

NOVEMBER 2020 - NOVEMBER 2023

AWS Certified Developer - Associate

AWS

Skills

Libraries/APIs

React, REST APIs, React Router, Node.js, jQuery

Tools

Webpack, Git, Babel, Figma, Bitbucket, Vagrant, Terraform

Languages

JavaScript, TypeScript, CSS, SCSS, HTML5, HTML, Sass, Bash, PHP, Python, C#, SQL

Frameworks

Jest, Redux, Next.js, Material UI, Symfony, Serverless Framework, Electron

Paradigms

REST, Search Engine Optimization (SEO), Continuous Integration (CI), Test-driven Development (TDD)

Platforms

Visual Studio Code (VS Code), Amazon Web Services (AWS), Docker, Apache Kafka, Kubernetes, AWS Lambda, Firebase, Google Cloud Platform (GCP), Vercel

Storage

MongoDB, Databases, Elasticsearch, Datadog

Other

Front-end, Full-stack, Web UI, API Integration, Full-stack Development, Business Technology, Web Development, RESTful Services, ESLint, Storybook, Server-side Rendering (SSR), Infrastructure as Code (IaC), Web UX, Discord, AWS Cloud Architecture, OpenAI GPT-3 API, APIs, Data Visualization, Styled-components, CSS Preprocessors, Cursor AI, WebSockets, Artificial Intelligence (AI)

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