# Staff Machine Learning Engineer, Fraud & Abuse

**Company:** [Square](https://hotfix.jobs/companies/square)
**Location:** Remote
**Role:** ML Engineering
**Salary:** $277k – $415k/yr
**Experience:** 12+ years
**Skills:** Python, Java, Kotlin, SQL, TensorFlow, PyTorch, Xgboost, Lightgbm, Kubernetes, Embeddings, Semantic Search, Feature Stores, Model Serving, Experimentation Systems, Ranking Systems
**Posted:** 2026-09-03

> Build and operate production machine learning systems for ranking, retrieval, recommendations, personalization, and customer intelligence. The role requires 12+ years of production software and ML experience, strong expertise in intelligent systems, and sound judgment around trustworthy customer-impacting signals.

## Job Description

## Responsibilities
- Build and operate production machine learning systems that transform customer and product context into trusted signals, rankings, recommendations, and decision capabilities.
- Design production data and signal contracts covering intended use, freshness, provenance, confidence, eligibility, and calibration.
- Own ranking, retrieval, recommendation, search, propensity, and next-best-action systems end to end, including feature and candidate generation, serving, experimentation, monitoring, and feedback loops.
- Evaluate customer and business impact across trust, fairness, access, risk, compliance, long-term engagement, and segment-level performance.
- Partner with product, growth, data, platform, modeling, risk, and compliance teams to translate ambiguous goals into measurable ML system designs.
- Use AI and agent-assisted tools to accelerate development, analysis, testing, documentation, and operations while exposing reusable capabilities to product services and internal tools.

## Requirements
- 12+ years building and operating production software and machine learning systems for business-critical products.
- Deep expertise in ranking and retrieval, recommendations, search, personalization, growth and lifecycle ML, customer intelligence, propensity, churn/LTV, next-best-action, or model-derived risk signals.
- Strong production ML judgment across feature pipelines, model serving, experimentation, monitoring, feedback loops, online/offline consistency, and reliable signal interfaces.
- Ability to evaluate impact beyond short-term conversion, including trust, fairness, access, risk, compliance, and long-term engagement.
- Experience using AI-assisted engineering tools with verification, testing, and review for customer-impacting systems.

## Nice to Have
- Semantic retrieval, embeddings, two-tower models, graph features, LLM-powered retrieval or decision systems, entity resolution, or real-time personalization.
- Experimentation, online evaluation, interleaving, counterfactual evaluation, multi-objective optimization, or long-term holdouts.
- Reusable feature or signal platforms, decision services, customer intelligence layers, model-derived data products, or agent-assisted operations.

## Technologies
- Python, Java, Kotlin, SQL
- TensorFlow, PyTorch, XGBoost, LightGBM
- Ranking and retrieval systems, embeddings, semantic search, recommendation frameworks
- Event streams, batch pipelines, feature stores, model-serving infrastructure
- Workflow orchestration, experimentation systems, data warehouses, and lakehouses
- Cloud infrastructure, Kubernetes, observability tooling, coding agents, and evaluation harnesses

## Compensation and Benefits
- Annual salary range of $276,800–$415,200 USD.
- Benefits include remote work, medical insurance, flexible time off, retirement savings plans, and modern family planning.

## Similar jobs

- [Senior Staff Machine Learning Engineer, Feed Relevance](https://hotfix.jobs/jobs/a2f9b178-c6cf-49bf-ba93-00688d1027fb) - Reddit - Remote - $266k – $372k/yr
- [Senior Staff Machine Learning Systems Engineer, Ads ML Platform](https://hotfix.jobs/jobs/efc443bf-db64-4fa3-b123-eb399c454a93) - Reddit - Remote - $293k – $410k/yr
- [Staff Machine Learning Operations Engineer](https://hotfix.jobs/jobs/b5d46280-8221-4b6e-b0b2-033cc6f2c8d7) - Garner Health - New York, NY - $298k – $351k/yr
- [Staff Applied Scientist](https://hotfix.jobs/jobs/d518c7a7-07d4-4f06-af79-9c478df769ca) - Garner Health - New York, NY - $300k – $390k/yr
- [Staff Machine Learning Infrastructure Engineer, Embedding Platform](https://hotfix.jobs/jobs/9b4387bf-ac16-48ba-810b-2e6a612e3617) - Reddit - Remote - $253k – $355k/yr

**Apply:** https://hotfix.jobs/jobs/2068a66a-3fd2-42f6-ab53-d199be305035
**Canonical:** https://hotfix.jobs/jobs/2068a66a-3fd2-42f6-ab53-d199be305035