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Senior Data Scientist
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At a glance
- Employment type
- Full-time
- Workplace
- Hybrid
- Category
- Data engineering
Technologies & skills
What you'll be doing
Senior Data Scientist role at MongoDB in Dublin, focusing on machine learning features for core server, query engine, and Atlas. Collaborate with engineering teams to optimize resource scaling, release safety, and monitoring. Own ML lifecycle, deliver production-ready algorithms, and contribute to team culture and productivity.
- Partner with engineering teams to embed algorithmic rigor and optimization into resource scaling, release-safety, and monitoring systems
- Deliver production-ready, thoroughly tested statistical and ML algorithms with well-identified limitations
- Own the full feedback loop: instrument model architecture, track performance, create dashboards, collect feedback, and iterate
- Contribute code reviews and act as a core contributor to internal packages, tooling, and team processes
Key requirements
Must-have
- 5+ years of hands-on machine learning model development
- Experience working autonomously across the entire machine learning development lifecycle
- Object-oriented approach to designing scalable and readable Python codebase
- Experience working with engineers on architecture design of machine learning systems
- Ability to review, understand, and redesign any code that ships
- Effective communication of technical ML concepts to non-ML-expert audiences
- Master's degree or equivalent experience in a quantitative/computational discipline
Experience: 5+ years
Role signals
- Technical focus
- machine learning, data science, engineering collaboration
- Leadership
- Mentoring
- Architecture / system design
- Indicated in the listing
- Hands-on vs management
- Hands-on
Similar jobs
Full job description
As Senior Data Scientist for Engineering Systems you will work independently alongside sharp, generous, and pragmatic engineers from Server Query, Atlas Clusters, and Release Quality, among other teams. Together, we tackle problems spanning resource scaling across the Atlas fleet, safe feature rollout to MongoDB clusters, automated incident response and query engine performance. Join the Platform Data Science team and help us research, prototype and ship machine learning features for MongoDB’s core server, query engine and Atlas, our database-as-a-service cloud offering.
We are looking to speak to candidates who are based in Dublin or Cork for our hybrid working model.
What You'll Do
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Partner with Server Query, Atlas Clusters, Release Quality and other engineers to embed algorithmic rigor and optimization into resource scaling, release-safety and monitoring systems across the fleet and inside query engine
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Deliver production-ready, thoroughly tested statistical and ML algorithms with well-identified limitations that deliver measurable business impact, not just an impressive-sounding methodology
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Own the full feedback loop: instrument model architecture with the metrics needed to track performance and create dashboards in collaboration with our stellar analytics team, collect feedback from users and metrics to diagnose issues or opportunities, and iterate accordingly
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Deliver thoughtful, kind code reviews to your peers and act as a core contributor to internal packages, tooling, and team processes that increase developer productivity
Measures of Success
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In 3 months, you’re familiar with our workflow, have an elementary understanding of our product and what teams we work with. You have delivered small-to-medium improvements to our project portfolio
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In 6 months, you’ve delivered one feature you researched and prototyped from scratch and demonstrated its impact on business metrics of your choice
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In 12 months, you've established a track record of shipping ML-driven improvements to fleet stability, efficiency, or operational automation; deepened working relationships with two or more partner engineering teams; and become a go-to resource for statistical or engineering rigor across the team
Skills & Attributes
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5+ years of hands-on machine learning model development, working directly with technical stakeholders
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Expertise and track of record working autonomously across the entire machine learning development lifecycle, including prototyping, simulation, tuning and iterating on products in deployment environments with and without dedicated engineering help
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Embraces an object-oriented approach to designing scalable and readable Python codebase, and has experience working with engineers on architecture design of machine learning systems
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Our codebase is primarily in Python and we use AI for developer productivity - but we expect all ICs to review, understand, and be able to redesign any code that ships regardless of whether a human or an AI wrote the first draft
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Takes ownership of team culture: models psychological safety, and - in whatever way suits their style, whether that's a quiet word or a vocal challenge - encourages others to speak up and calls out when the environment isn't living up to it
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Effective at communicating technical ML concepts to non-ML-experts audiences; e.g. able to translate efficacy measurements of ML models and products into tangible business impact metrics
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Master's degree or equivalent experience in a quantitative/computational discipline (computer science, applied mathematics, statistics, physics, operations research, etc.)
About MongoDB
MongoDB is built for change, empowering our customers and our people to innovate at the speed of the market. We have redefined the data platform for the AI era, enabling builders to create, transform, and disrupt industries with software. MongoDB’s unified data platform, the most widely available, globally distributed data platform on the market, helps organizations modernize legacy workloads, embrace innovation, and unleash AI. Our cloud-native platform, MongoDB Atlas, is the only globally distributed, multi-cloud data platform and is available across AWS, Google Cloud, and Microsoft Azure.
With offices worldwide and over 67,000 customers, including 75% of the Fortune 100 and AI-native startups, relying on MongoDB for their most important applications, we’re powering the next era of software.
Our compass at MongoDB is our Leadership Commitment, guiding how and why we make decisions, show up for each other, and win. It’s what makes us MongoDB.
To drive the personal growth and business impact of our employees, we’re committed to developing a supportive and enriching culture for everyone. From employee affinity groups, to fertility assistance and a generous parental leave policy, we value our employees’ wellbeing and want to support them along every step of their professional and personal journeys. Learn more about what it’s like to work at MongoDB, and help us make an impact on the world!
MongoDB is committed to providing any necessary accommodations for individuals with disabilities within our application and interview process. To request an accommodation due to a disability, please inform your recruiter.
MongoDB is an equal opportunities employer.
Req ID: 3273521781
Interview prep pack
Grounded in this listing. Use it to prepare examples before you apply.
Your interview focus
You will be assessed on your ability to independently deliver production-ready ML solutions for MongoDB's core server and cloud platform, collaborate with engineering teams, and communicate technical results to diverse audiences. Strong Python, cloud, and end-to-end ML lifecycle expertise are essential.
- Production ML delivery·High
- Python & object-oriented design·High
- Cloud platforms (AWS/Azure/GCP)·High
- Cross-team collaboration·High
Only have 30 minutes?
Follow a focused preparation plan based on this job.
Start 30-minute prep
Your 30-minute plan
Review End-to-End ML Project
0–8 minChoose a project where you owned the full ML lifecycle. Note challenges, business impact, and collaboration points.
Refresh Python & OOP Practices
8–15 minSkim recent code or notes on scalable, maintainable Python ML systems. Focus on design and code review.
Map Cloud ML Deployment Experience
15–23 minList your experience with AWS, Azure, or GCP for ML. Recall deployment, monitoring, and scaling details.
Prepare Communication Examples
23–30 minRecall times you explained ML concepts to non-experts and contributed to team culture. Note outcomes.
Talking points
, 6 itemsEnd-to-End Machine Learning Lifecycle
You will own prototyping, deploying, monitoring, and iterating on ML models in production, often autonomously.
Python and Object-Oriented Design
The codebase is primarily Python, and you are expected to design scalable, readable, and maintainable ML systems.
Cloud Platforms: AWS, Azure, GCP
MongoDB Atlas operates across all major clouds; experience with these environments is crucial for deploying and scaling ML features.
Collaboration with Engineering Teams
You will partner with multiple engineering groups to embed ML solutions and must communicate and work effectively across disciplines.
Statistical Rigor and Business Impact
Delivering measurable business value and clearly articulating the impact of ML models is a key expectation.
Code Review and Developer Productivity
You are expected to contribute to internal tooling, review code (including AI-generated code), and support team productivity.
What to research
, 3 itemsIndependent End-to-End ML Delivery
You are expected to research, prototype, deploy, and iterate on ML features with minimal supervision, including monitoring and feedback loops.
Cross-Team Collaboration in Engineering Systems
Success depends on working closely with multiple engineering teams to embed ML solutions into core systems and cloud services.
Production-Ready Python and Cloud ML Systems
Strong skills in Python, object-oriented design, and deploying ML models on AWS, Azure, or GCP are essential for this role.
Questions to ask
, 6 itemsHow does the Platform Data Science team collaborate with Server Query and Atlas Clusters teams?
Why ask this? Clarifies cross-team workflows and expectations.
What are the main challenges in deploying ML features to MongoDB Atlas?
Why ask this? Reveals technical hurdles and required expertise.
How is the impact of ML-driven features measured and communicated to stakeholders?
Why ask this? Shows how your work will be evaluated and valued.
What tools and processes are used for code reviews, especially with AI-generated code?
Why ask this? Helps you understand development standards and expectations.
How does the team support continuous learning and staying updated with new ML techniques?
Why ask this? Indicates opportunities for professional growth.
What does success look like in the first 6-12 months for this role?
Why ask this? Clarifies performance expectations and priorities.
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