Senior Fullstack Developer (JavaScript)

Holisticon Insight is a data-focused technology and consulting company, part of the Nexer Group.

Our mission is simple: We make companies Data Driven.

We help organizations turn data into real business value. We design and build modern data platforms, business intelligence solutions, and AI systems that help companies make better decisions, improve operations, and create new digital services. Our expertise covers the whole data journey - from collecting and integrating data, through analytics and visualization, to advanced AI and machine learning. We achieve this by combining our expertise in building data platforms and IoT platforms, using business intelligence, and applying artificial intelligence and machine learning to enable more advanced analytics.

At Holisticon Insight we focus on strong competencies, collaboration, and delivering real outcomes for our customers. We keep a family-like culture with flat structure and empowered teams where every voice counts. Check us out! 👉 https://holisticon.pl/holisticon-insight/

We offer a B2B Contract:

• 140 – 175 PLN net/hour + VAT

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.

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)