Senior Fullstack Developer (JavaScript)

Holisticon Insight is a division of http://nexergroup.com focused on IoT, AI, and advanced analytics. We assist our customers in developing IoT services, portals, and mobile apps and, above all, analyze data using AI and advanced analytics to reduce costs, streamline, and find new opportunities for the business. Our goal is to grow strong but rather in competencies than in numbers. We get things done and, on the way, we build a dynamic company culture to create the best place for our development. We love the atmosphere of a family business with its flat structure and self-organized teams where every opinion matters and influences our way of working   Check us out! 👉 https://holisticon.pl/holisticon-insight/ We are looking for a Senior Fullstack Engineer to join a cutting-edge AI initiative of our client. The project focuses on resolving data fragmentation and incompleteness by building an end-to-end AutoML pipeline that identifies missing data, trains predictive models, and automatically enriches datasets. As a Fullstack Engineer, you will play a key role in making this AI system accessible, observable, and controllable at scale.    We offer a B2B Contract: • 140 – 175 PLN net/hour + VAT Your responsibilities: • Build and develop an admin dashboard to monitor pipeline health and model performance • Design intuitive data-heavy UI views with drill-down capabilities • Develop tools for manual and scheduled execution of training pipelines • Implement system controls, including model overrides and blacklisting • Build and maintain backend services for:• user permissions • access logs • auditing and error handling • Integrate inference outputs and enable automated data write-backs • Collaborate closely with Data Engineers, ML Engineers, and DevOps • Ensure high standards in code quality, testing, and system reliability   You might be the perfect match if you possess the following competencies: • 5+ years of prior experience as a Fullstack Engineer • Strong experience with: Frontend: React, Vue, or Angular (React preferred) • Backend: Node.js or Python (FastAPI, Flask, or Django) • Experience building analytical dashboards or data-heavy UIs • Understanding of modern software architecture (microservices, APIs, distributed systems) • Experience working with cloud platforms (Azure, AWS, or GCP) • Familiarity with authentication, logging, and monitoring systems • Strong focus on clean code, testing, and best practices • Excellent English communication skills • Location in Poland or EU 🙌 Nice to have: • Experience working with ML pipelines or AI platforms • Background in data platforms or AutoML systems • Experience with workflow orchestration tools By joining Holisticon Insight you will get: • Life insurance • Multisport card • Fully remote job • Private medical care • Flexible working hours • B2B or contract of employment • Amazing integration events on a regular basis • Training budget (e.g. Microsoft Azure Certifications) • Opportunity to impact our company culture build-up • Work equipment (laptop, 2 monitors, and accessories)