Senior Full Stack Engineer

EPAM Systems; United States; Remote; USD 67,000 - 123,000; Full time

Job summary

EPAM Systems Inc. is seeking a Senior Full Stack Engineer for full remote work from Portugal. You will shape how teams deliver scalable software, balancing immediate needs with long-term resilience, driving ideas into robust, real-world solutions.

You will tackle tasks across frontend and backend stacks, champion best practices, and collaborate with partners and customers to deliver high-quality software at scale.

Qualifications

• Fluency in JavaScript with modern ES6 syntax and CSS3 and expert knowledge of ReactJS, Redux and GraphQL.
• Strong understanding of CI/CD, web testing automation, secure coding practices, and browser testing.

Responsibilities

• Execute specific project and team tasks
• Apply experience with project work and associated methods
• Demonstrate technical and IT-relevant expertise in the sector
• Design and realize work packages
• Deliver medium to large tasks with little or no guidance
• Help refine product requirements and ideas
• Evangelize best practices
• Communicate strongly
• Fulfill all Engineer II responsibilities

Skills

JavaScript ES6

ReactJS

Redux

GraphQL

Jasmine

Jest

CI/CD

GitHub flows

Android (Java/Kotlin)

iOS (Swift)

C++

Python

AWS

REST/GraphQL API design

Spark/BigQuery/Kafka

Tools

Xcode

Android Studio

IntelliJ

Sauce Labs

Git

GitHub

Jenkins

Nginx

Job description

What separates software that works from software that lasts is the ability to absorb change without accumulating technical debt. The Senior Full Stack Engineer role in Portugal is full remote and sits at the intersection of dependable software and scalable platforms. You decide how technical choices shape the future of a product, balancing immediate needs with long-term resilience. The role is defined by the drive to refine ideas into solutions that hold up under real-world demands. The person in this role shapes how teams deliver work that stands up to growth and complexity.

Responsibilities

• Execute specific project and team tasks
• Apply experience with project work and associated methods
• Demonstrate technical and IT-relevant expertise in the sector
• Design and realize work packages
• Deliver medium to large tasks with little or no guidance
• Help refine product requirements and ideas
• Evangelize best practices
• Communicate strongly
• Fulfill all Engineer II responsibilities

Requirements

• Fluency in JavaScript with modern ES6 syntax and CSS3, and expert knowledge of ReactJS, Redux, GraphQL, Jasmine, Jest, redux-saga, redux-thunk, webpack, eslint, WebdriverIO, nginx and Jenkins
• Understanding of web app designs, CI/CD, web testing automation, secure coding practices and security-focused testing, and browser testing with Saucelabs
• Solid knowledge of source control, especially tools such as Git and GitHub flows, and understanding of web app designs and CI/CD
• Fluency in either Android (Java 8+, Kotlin, SQLite), iOS (Swift, Objective-C, Cocoapods) or C++ technology set, and experience with Xcode, Android Studio, IntelliJ and similar IDEs
• Understanding of mobile app designs, CI/CD, mobile testing automation and secure coding practices, and solid knowledge of source control, especially Git and familiarity with Git flow and GitHub flows
• Experience deploying an app on the respective Google Play Store or Apple App Store (or comparative experience for internal corporate development), and experience with dependency management, SDKs and API contracts
• Fluency in Java and/or Python, and strong knowledge of software development methodologies and best practices
• Deep understanding of API design principles and patterns, and experience in one or more technologies: OAuth, RESTful and/or GraphQL API design, and AWS or other public cloud platforms
• Experience working with customers, partners or developers in the technical industry, and understanding and following Secure Software Development Lifecycle practices (SSDLC)
• Experience with distributed data systems such as Spark, BigQuery or Kafka, and experience designing and modeling both logical and physical data models, and SQL and NoSQL experience