Senior Java/ Machine Learning Engineer (Supply Chain & Fulfillment)

Job Description

Job Description

Title: Senior Java / Machine Learning Engineer (Supply Chain & Fulfillment)

Overview

We're hiring a Senior Java / ML Engineer to build intelligent systems that power demand forecasting,

inventory optimization, routing, and fulfillment in a large-scale retail environment. This role

bridges backend engineering and production ML, turning models into real-time decisioning

systems used across distribution centers and eCommerce platforms.

You'll work with high-volume data and partner with product, data science, and operations to deliver

systems that directly impact in-stock rates, delivery speed, and cost efficiency.

Responsibilities

· Design and build Java-based microservices (Spring Boot) real-time inference

· Productionize ML models for forecasting, recommendations, and optimization

· Build data pipelines for training and inference (batch + streaming)

· Expose models via REST/gRPC APIs and integrate into operational systems (WMS, order

routing)

· Optimize for latency, throughput, and reliability in distributed systems

· Implement monitoring (model drift, accuracy, latency, failure modes) and retraining strategies

· Partner with DS to choose between heuristics vs classical ML vs LLM/agentic approaches

· Contribute to CI/CD and DevOps for ML systems

· Participate in architecture decisions and mentor engineers

Required

· 5–8+ years in software engineering with strong Java

· Experience with Spring Boot and microservices

· Hands-on experience integrating ML into production systems

· Strong systems design (APIs, distributed systems)

· Working knowledge of Python for ML workflows

· Solid SQL + experience with large-scale data

· Cloud experience with Google Cloud Platform, Amazon Web Services, or Microsoft Azure

· Docker + Kubernetes

· Comfortable operating in ambiguous, high-impact environments

Preferred

· Experience with Kafka / PubSub

· MLOps tooling (MLflow, Vertex AI)

· Experience with forecasting, inventory, routing, or pricing

· Exposure to LLMs, RAG, or agent-based systems

· Experience in retail, supply chain, or logistics

Ideal Profile

A backend-heavy engineer who has successfully shipped ML-powered services and understands

tradeoffs between heuristics, ML, and AI systems in real-world operations.

Marathon TS provides a full range of professional services for clients that require support from professionals with specialized skills and experience in a specific technical area or subject matter. Marathon TS also provides IT solutions, including strategy, operations, transformation and mission support.

Company Description

Marathon TS provides a full range of professional services for clients that require support from professionals with specialized skills and experience in a specific technical area or subject matter. Marathon TS also provides IT solutions, including strategy, operations, transformation and mission support.