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Senior Full-Stack Engineer (React, NestJS)

Zartis

European Union Hybrid permanent

Posted: January 14, 2026

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Quick Summary

We are looking for a Senior Fullstack Engineer to work on a wide range of projects, including application development, software architecture, CI/CD, business intelligence, QA automation, and new technology integrations.

Job Description

The company and our mission:

Zartis is a digital solutions provider working across technology strategy, software engineering and product development.

We partner with firms across financial services, MedTech, media, logistics technology, renewable energy, EdTech, e-commerce, and more. Our engineering hubs in EMEA and LATAM are full of talented professionals delivering business success and digital improvement across application development, software architecture, CI/CD, business intelligence, QA automation, and new technology integrations.

We are looking for a Senior Fullstack Engineer to work on a project in the green energy industry.

The project:

Our teammates are talented people that come from a variety of backgrounds. We’re committed to building an inclusive culture based on trust and innovation.

You will be part of a distributed team developing new technologies to solve real business problems that will positively impact the sustainability of our climate.

We are looking for someone with good communication skills, ideally with experience making decisions, being proactive, used to building software from scratch, and with good attention to detail.

What you will do:

-Take responsibility for the full software development lifecycle, i.e. you design, implement, test, QA, deploy and maintain new and existing features.
-Contribute to improving the product by being a sparring partner to product managers.
-Make architecture decisions as a key member of an engineering team.
-Participate in discussions on how to maintain and improve micro-service architecture.
-Work closely with other engineers to identify and mitigate tech debt.
-Contribute to driving technical innovation and finding sustainable solutions for technical challenges such as:
*Upscaling every part of the application to be able to process large amounts of data.
*Further developing the setup for data pipelines and data warehousing to enable near-real-time data processing and
generation of insights.
*Driving the integration of AI solutions together with our data team.

What you will bring:

-You bring 5+ years of relevant hands-on experience in product development, including Frontend (React, Redux), Backend (NestJS), and Data (PostgreSQL).
-You write well-structured and high-quality code that’s easily maintainable by others.
-You are curious about new technologies including AI, and ideally bring some experience on how to use AI to make the development process more efficient.
-You are passionate about ClimateTech and have a strong commitment to fighting climate change.
-You are self-driven and capable of working with minimal supervision.
-You are fluent in English with excellent written and spoken communication skills.

What we offer:

-100%Remote
-WorkWFH allowance: Monthly payment as financial support for remote working.
-Career Growth: We have established a career development program accessible for all employees with a 360º feedback that will help us to guide you in your career progression.
-Training: For Tech training at Zartis, you have time allocated during the week at your disposal. You can request from a variety of options, such as online courses (from Pluralsight and Educative.io, for example), English classes, books, conferences, and events.
-Mentoring Program: You can become a mentor in Zartis or you can receive mentorship, or both.
-Zartis Wellbeing Hub (Kara Connect): A platform that provides sessions with a range of specialists, including mental health professionals, nutritionists, physiotherapists, fitness coaches, and webinars with such professionals as well.
-Multicultural working environment: We organize tech events, webinars, parties, and activities to do online team-building games and contests.

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