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 + VATYour responsibilities:Build and develop an admin dashboard to monitor pipeline health and model performanceDesign intuitive data-heavy UI views with drill-down capabilitiesDevelop tools for manual and scheduled execution of training pipelinesImplement system controls, including model overrides and blacklistingBuild and maintain backend services for:user permissionsaccess logsauditing and error handlingIntegrate inference outputs and enable automated data write-backsCollaborate closely with Data Engineers, ML Engineers, and DevOpsEnsure 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 EngineerStrong 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 UIsUnderstanding of modern software architecture (microservices, APIs, distributed systems)Experience working with cloud platforms (Azure, AWS, or GCP)Familiarity with authentication, logging, and monitoring systemsStrong focus on clean code, testing, and best practicesExcellent English communication skillsLocation in Poland or EU🙌 Nice to have:Experience working with ML pipelines or AI platformsBackground in data platforms or AutoML systemsExperience with workflow orchestration toolsBy joining Holisticon Insight you will get:Life insuranceMultisport cardFully remote jobPrivate medical careFlexible working hoursB2B or contract of employmentAmazing integration events on a regular basisTraining budget (e.g.

Microsoft Azure

Certifications)Opportunity to impact our company culture build-upWork equipment (laptop, 2 monitors, and accessories)