Senior ML-Engineer

FundraiseUp Inc.

Job Overview

Location

Poland - Remote

Job Type

Full-time

Full Job Description

📋 Description

• Senior ML-Engineer role at FundraiseUp Inc. focused on building and deploying machine learning solutions that directly impact nonprofit fundraising performance, including optimizing donation flows, building AI assistants, and improving transaction classification systems used by global organizations like UNICEF and the American Heart Association.
• The role is critical to enhancing conversion rates, user experience, and revenue generation for enterprise clients across the US, Canada, UK, and Australia through innovative ML and LLM applications.
• Develop and deploy ML solutions across different business areas using tabular data (uplift models, recommender systems) and e-commerce mechanics to improve donation conversion and user engagement.
• Select the most appropriate ML/LLM approaches or propose alternative solutions, including classical algorithms and modern NLP techniques, based on problem context and business impact.
• Build end-to-end ML solutions: data preparation, training, API development, and monitoring, ensuring production readiness and scalability.
• Design LLM-powered features: from simple classifiers and content generation to complex AI assistants and chatbots for admin panels and user-facing tools.
• Work across the full LLM lifecycle: golden datasets, prompt engineering, fine-tuning, and response evaluation to ensure high-quality, reliable AI outputs.
• Collaborate with 10+ product teams as part of an internal ML center of excellence, contributing to diverse projects ranging from donation optimization to smart assistant development.
• Operate in a tight-knit, high-impact product development team of 150+ engineers across Spain, Serbia, Poland, Portugal, Turkey, Cyprus, Georgia, and Armenia, with primary communication in Russian and strong English (B2) required for cross-functional alignment.
• Participate in a dynamic, collaborative environment that values open dialogue, knowledge sharing, and bi-weekly engineering meetups to explore technical topics and showcase innovations.
• Contribute to a mission-driven organization where ML work directly supports nonprofit fundraising success, with tens of millions of dollars processed monthly through the platform.
• Opportunity to grow expertise in cutting-edge ML/LLM applications, MLOps practices, and product-oriented engineering within a flat, transparent culture that values long-term impact and equity ownership.

🎯 Requirements

• 5+ years of ML/DS experience solving real product problems in production environments
• Strong expertise in ML and mathematical statistics: solid knowledge of classical algorithms (especially gradient boosting) and understanding of modern NLP/LLM approaches
• Metrics-driven mindset: ability to connect ML metrics (ROC-AUC, F1, RMSE) with business metrics (conversion rate, LTV)
• Strong engineering culture: confident in Python with product-oriented approach; values clean code, design patterns, and solid engineering practices
• Data skills: advanced SQL; ability to independently build complex datasets in ClickHouse and work with MongoDB
• MLOps understanding: hands-on experience with experiment tracking tools and understanding of production workflows (Docker, Git, CI/CD)
• Autonomy: ability to break down problems, choose the right tech stack (or justify non-ML solution), and deliver to production

🏖️ Benefits

• 31 days off per year
• 100% paid telemedicine plan
• Home Office Setup Assistance: support for purchasing furniture (office chair, desk, monitor) and equipment for a comfortable remote workspace
• English learning courses
• Relevant professional education support
• Gym or swimming pool access
• Co-working space access
• Fully remote working arrangement

Skills & Technologies

Python

FastAPI

MongoDB

Redis

Docker

Senior

Remote

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FundraiseUp Inc.

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About FundraiseUp Inc.

FundraiseUp provides a SaaS donation platform for nonprofits, charities, and NGOs. Its technology uses AI and behavioral data to personalize giving experiences, increase donor conversion, and reduce abandonment. Features include one-click payments, recurring giving, multilingual donation forms, and analytics dashboards. The platform integrates with CRMs like Salesforce and Blackbaud, supports Apple Pay, Google Pay, PayPal, ACH, and credit cards, and offers A/B testing and fraud protection. It serves organizations worldwide, helping them raise funds online without dedicated technical staff.

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