Senior Back End Developer Oeiras

Overview

Ko
Start is an internet company focusing on highly competitive industry verticals. Our main markets include the United States of America, the United Kingdom, Italy, Spain, the Netherlands, Germany, Sweden, Australia, Canada. We specialize in the creation and promotion of web and mobile projects, striving for excellence in all aspects of our work.

Role Description

The Senior Back End Developer role is a
- time, hybrid position located in Oeiras, with some flexibility for working from home. The Back End Developer will be responsible for designing, building, and maintaining
- side web applications. Day-to-day tasks include collaborating with mobile developers, product manager, writing efficient and secure code, integrating
- side logic with
- end elements, and ensuring high performance and responsiveness of applications.

Qualifications

• Powerful s
  - discipline, strong skills in
  - management and transparent workflow
• Strong in
  Node. js, Nest
  JS, Type
  Script with real production experience
• Firebase Cloud Functions is a plus
• Confident inboth backend (APIs, DB, integrations) and frontend (React or
  Next, CSS, Vanilla js)
• Experience with Mongo
  DB, Postgre
  SQL, AWS/Google Cloud
• Understanding ofcloud infrastructure and deployment processes
• Experience building scalable API search mechanisms and MCP server architectures
• Familiarity with LLM operations and AI-powered system integration
• Able towork independently, make technical decisions, and back them upwith solid reasoning
• Extensive knowledge in backend optimization approaches
• Familiar with scaling mobile products with server side and optimizing performance
• Writes clean, maintainable code with tests
• Communicates well with both tech and non tech team members
• Proficiency in Object-Oriented Programming (OOP)
• Excellent
  - solving and communication skills
• Ability to work in a team and independently in a hybrid work environment
• Bachelor's degree in Computer Science, Engineering, or a related field is preferred

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Engineering and Information Technology

Industries

• Technology, Information and Internet

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