Join us at Nayax, a global fintech leader (NASDAQ; TASE: NYAX) revolutionizing the world of cashless payments, consumer engagement, and business management solutions. With more than 1,200 employees across 12 offices worldwide. At Nayax, you’ll be part of a diverse and innovative community where your work makes a real impact and helps shape the future of payments.
We are currently looking for a Senior Machine Learning Engineer to design and implement scalable and integrate machine learning solutions into production. You will work with modern technologies like Node.js, Python, Kafka, MongoDB, and OpenSearch, AirFlow, while driving architectural decisions and CI/CD best practices. This role combines backend engineering excellence with ML deployment expertise.
The Senior Machine Learning Engineer will report directly to the Director of R&D.
Your key responsibilities will include:
- Architect and develop MLE services using Python, ensuring high performance, reliability, and scalability.
- Collaborate with Data Science teams to productionize ML models (model serving, monitoring, retraining pipelines).
- Build and maintain CI/CD pipelines for automated testing, deployment, and monitoring.
- Design and implement system architecture for distributed, event-driven systems.
- Integrate and optimize Kafka for real-time data streaming and event processing.
- Design and manage MongoDB schemas and queries for optimal performance.
- Implement and maintain OpenSearch clusters for search and analytics use cases.
- Ensure security, observability, and fault tolerance across all services.
- Mentor team members and contribute to engineering best practices.
- Minimum 6+ years of backend development experience - Must
- Experience with Machine Learning - Must.
- Strong expertise in Python for production systems - Must.
- Proven experience in system architecture for distributed applications.
- Hands-on experience with CI/CD pipelines (GitHub Actions, GitLab CI, Jenkins, etc.).
- Deep knowledge of Kafka (producers, consumers, partitioning, scaling).
- Proficiency with MongoDB (schema design, indexing, aggregation).
- Experience with OpenSearch/Elasticsearch (indexing, queries, performance tuning).
- Solid understanding of containerization (Docker) and cloud deployment (Kubernetes or similar).
Nice-to-Have
- Experience with Argo CD and GitOps workflows, and AirFlow.
- Knowledge of ML lifecycle tools (MLflow, Kubeflow, TensorFlow Serving).
- Observability stack: Prometheus, Grafana, OpenTelemetry.
- Performance optimization and distributed systems troubleshooting.
Tech Stack
- Backend: Node.js, Python, REST/GraphQL APIs
- Data: MongoDB, Kafka, OpenSearch
- Infra: Docker, Kubernetes, CI/CD pipelines
- Bonus: Argo CD, Erlang/Elixir, ML deployment frameworks
Top Skills
What We Do
Welcome to Nayax, a global fintech company (NASDAQ; TASE: NYAX) dedicated to providing businesses with a comprehensive payment platform and management system for their operation. Since 2005, we've been at the forefront of the cashless payment revolution, offering innovative IoT services and management solutions for unattended retail.
Driven by our customer-first mindset and a commitment to in-house development, Nayax has evolved into a leading omnichannel retail solution provider. With over 1100 talented employees located in 11 offices around the world, we proudly serve customers in more than 120 countries. We've established partnerships with several global financial institutions in order for our platform to be able to accept over 50 currencies and over 80 major forms of payment. Moreover, Nayax holds a license as a payment institution in Europe.
As consumers increasingly embrace digital payment methods, Nayax continuously develops value-added services for our customers. From consumer engagement solutions and customized payment methods to an extensive API suite and a feature-rich mobile wallet app, our fully customizable management system provides an agile ecosystem that empowers merchants to improve their bottom line.
Our commitment to innovation and to our customers sets us apart. Rooted in our core values, Nayax's dedicated teams consistently deliver innovative products that meet the evolving needs of retailers and consumers alike. Our mission is to empower retailers by providing them with growth tools and systems that reduce operational costs.
At Nayax, we believe in creating a lasting impact on our customers' businesses, converting casual consumers into dedicated followers. By offering consumer engagement tools, loyalty programs, and omnichannel solutions, we help retailers increase their bottom line and accelerate their growth.
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