JD - Senior Software Engineer 1, ML

Accountabilities, Actions and Expected Measurable Results

Recommendation Algorithm Development 30%

• Design and build the core personalization engine using user-saved product data as behavioral signals.

• Develop multi-signal recommendation models that incorporate brand affinity, product category, color palette, fit/sizing signals, price sensitivity, and trends.

• Implement and evaluate a range of approaches including collaborative filtering, content-based filtering, and hybrid neural architectures.

• Build and maintain product embedding models that capture rich semantic similarity across the retailer feed catalog.

• Develop cold-start strategies to generate high-quality recommendations for new users with limited save history.

Data Ingestion & Feature Engineering 25%

• Design and maintain robust pipelines to ingest, normalize, and enrich product feeds from thousands of retail partners.

• Collaborate on a unified product taxonomy and attribute extraction layer that standardizes inconsistent retailer data into coherent features (category, color, material, fit, etc.).

• Leverage NLP and computer vision techniques to extract attributes from unstructured product descriptions and images.

• Partner with the data engineering team to maintain data quality, freshness, and catalog coverage at scale.

Personalized Feed & Ranking 25%

• Build and own the ranking and re-ranking layer that assembles each user's personalized feed in real time.

• Develop and tune multi-objective ranking that balances relevance, novelty, diversity, and business goals (e.g., promoted/sponsored retailer partnerships).

• Implement feedback loops that continuously update user preference models based on implicit signals (saves, clicks, dwell time, shares).

• Build A/B testing solutions to rigorously evaluate ranking and recommendation changes against key engagement metrics.

Engineering Excellence 20%

• Own production systems. Debug issues across indexing, retrieval, ranking, and serving layers

• Create clear documentation for pipelines, models, APIs, and system design.

• Contribute to best practices for ML systems, API design, and scalable infrastructure.

• Stay current with advancements in recommendation, ranking, and personalization systems and apply them where they make practical impact.

Education:

Bachelor's degree in Computer Science, Engineering, or a related field.

Experience:

You have a strong foundation in modern backend and ML engineering practices and continue to learn and evolve. You bring:

• 5+ years of ML engineering experience focused on recommendation systems, personalization, or search ranking with hands-on depth in collaborative filtering, matrix factorization, content-based, and hybrid neural approaches.

• Proven experience designing, training, and deploying embedding models and vector retrieval (e.g., Milvus, Pinecone) for product or content similarity at catalog scale.

• Production experience serving real-time, low-latency ML predictions and managing the full model lifecycle - training, deployment, versioning, and monitoring - on cloud ML platforms such as AWS SageMaker or GCP Vertex AI (including Vertex AI Pipelines).

• Rigorous experimentation discipline: experiment design, A/B and multivariate testing, and the analytical ability to translate model results into clear product and business decisions.

• Extensive backend engineering with strong proficiency in Python and modern ML frameworks (PyTorch, TensorFlow, or JAX), plus working knowledge of Node.js and TypeScript.

• Experience designing large-scale data and feature pipelines using Apache Kafka, Spark, Beam, Airflow, or Flink for streaming ingestion, transformation, and feature engineering.

• Applied NLP and/or computer vision experience extracting structured attributes (category, color, material, fit) from unstructured product descriptions and imagery.

• Strong API and infrastructure foundations: REST and GraphQL design with secure auth (OAuth/JWT), Git-based workflows, containerization with Docker and Kubernetes, and production observability with Grafana, Kibana, and APM tooling.

• Curiosity and pragmatism around emerging AI, particularly LLMs and modern retrieval/ranking techniques, with a track record of bringing new approaches into real production use cases.

• Strong written and verbal communication, able to explain technical tradeoffs to both technical and non-technical stakeholders, with a data-driven approach to problem solving.

Specific Knowledge, Skills, Certifications and Abilities:

Core Tech Stack

• Backend and API development using Python, FastAPI, Node.js, and TypeScript.

• Search and indexing using Elasticsearch for relevance, retrieval, and query optimization.

• Event driven architecture and streaming using Apache Kafka.

• Vector search and embeddings infrastructure using vector databases such as Milvus or Pinecone.

• Cloud and infrastructure using Google Cloud Platform or Amazon Web Services with containerization via Docker and orchestration through Kubernetes.

Travel Required (Approximate): 0%