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Senior Full-Stack Engineer (React, NestJS)

Zartis
Remote
Full Time
Posted January 14, 2026
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Job Description

A Senior Full-Stack Engineer responsible for designing, developing, and maintaining software solutions in a microservices architecture, with a focus on green energy projects, utilizing React, NestJS, and data technologies, while contributing to technical innovation and sustainability goals.

Key Responsibilities

  • Design, implement, test, QA, deploy, and maintain new and existing features throughout the software development lifecycle.
  • Collaborate with product managers to improve the product and provide technical input.
  • Make architecture decisions and participate in maintaining and improving micro-service architecture.
  • Work with engineers to identify and mitigate technical debt.
  • Drive technical innovation and develop sustainable solutions for challenges such as data processing scalability and AI integration.

Requirements

  • Five years of relevant hands-on experience in product development, including Frontend React, Redux, Backend NestJS, and Data PostgreSQL.
  • Ability to write well-structured and high-quality code that is easily maintainable by others.
  • Curiosity about new technologies including AI, with some experience on how to use AI to make the development process more efficient (preferred but not mandatory).
  • Passion for ClimateTech and a strong commitment to fighting climate change.
  • Self-driven and capable of working with minimal supervision.
  • Fluent in English with excellent written and spoken communication skills.
  • Responsibility for the full software development lifecycle, including designing, implementing, testing, QA, deploying, and maintaining new and existing features.
  • Ability to contribute to product improvement by being a sparring partner to product managers.
  • Ability to make architecture decisions as a key member of an engineering team.
  • Participation in discussions on how to maintain and improve micro-service architecture.
  • Work closely with other engineers to identify and mitigate technical debt.
  • Contributing to driving technical innovation and finding sustainable solutions for technical challenges such as upscaling application components to process large amounts of data.
  • Further developing data pipelines and data warehousing to enable near-real-time data processing and insights generation.
  • Driving the integration of AI solutions together with the data team.

Benefits & Perks

100% remote work
Work from Home (WFH) allowance with monthly financial support
Career development program with 360º feedback
Time allocated during the week for tech training (online courses, English classes, books, conferences, events)
Mentoring program (opportunity to be a mentor, mentee, or both)
Access to Zartis Wellbeing Hub via Kara Connect, including sessions with mental health professionals, nutritionists, physiotherapists, fitness coaches, and webinars
Multicultural working environment with online team-building activities, webinars, parties, and contests

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