Software Engineer, Machine Learning (SWE II & SWE I) at Slack

**Who this is for** This role is for a practical, impact-oriented Machine Learning Engineer. It is ideal for someone who prefers building functional product fea

Work type: onsite

Salary: $128,500 – $260,100/yr

Type: Full-time

Summary

**Who this is for** This role is for a practical, impact-oriented Machine Learning Engineer. It is ideal for someone who prefers building functional product features and production-grade ML services over pure theoretical research. **Key highlights** You will work across the full stack of AI at Slack, including search, recommendation, and generative AI features like Slackbot. The team prioritizes delivering business value through robust, reliable ML systems that serve millions of daily users. **You might be a good fit if you...** - Have experience with common ML frameworks like PyTorch, Scikit-learn, or XGBoost. - Are proficient in fine-tuning LLMs or BERT-based models. - Can build and manage data processing pipelines and own features from end to end. - Enjoy collaborating with product managers and designers to conceptualize new, AI-driven user features.

Job Description

To get the best candidate experience, please consider applying for a maximum of 3 roles within 12 months to ensure you are not duplicating efforts.

Job Category

Software Engineering

Job Details

About Salesforce

Salesforce is the #1 AI CRM, where humans with agents drive customer success together. Here, ambition meets action. Tech meets trust. And innovation isn’t a buzzword — it’s a way of life. The world of work as we know it is changing and we're looking for Trailblazers who are passionate about bettering business and the world through AI, driving innovation, and keeping Salesforce's core values at the heart of it all.

Ready to level-up your career at the company leading workforce transformation in the agentic era? You’re in the right place! Agentforce is the future of AI, and you are the future of Salesforce.

IN SCHOOL OR GRADUATED WITHIN THE LAST 12 MONTHS? PLEASE VISIT FUTURE FORCE FOR OPPORTUNITIES

Slack is looking for a Machine Learning Engineer to craft and implement features, services, API methods, and models to leverage our data to make Slack a fabulous, robust, safe, and valuable product for our users. We work on applications across agentic systems (Slackbot), search, recommendation, and more, but ultimately are looking for engineers excited to drive impact at the forefront of conversational intelligence.

## At Slack, the impact can be huge:

We have over 10 million daily active users relying on our product.

At peak usage, a million messages a minute pass through Slack.

During the week, our users spend over a billion minutes a day active in our product.

Machine learning engineers at Slack touch a great variety of parts of our technical stack. At different points, you might find yourself building data pipelines, training recommendation models, fine tuning LLMs, implementing features in our application, or analyzing experiment data. We don’t expect everyone to be an expert in everything, but we are looking for candidates with experience in Machine Learning, a strength in at least a couple of these, and who are excited to learn the rest.

This is a practical machine learning team, not a research team. Our goal is to deliver business value with machine learning and data in whatever form that takes. Sometimes that means bootstrapping something simple like a logistic regression and moving on. Other times that means developing sophisticated, finely tuned models and novel solutions to Slack’s unique problem space. We are looking for engineers who are driven by driving impact for our business, building great products for our customers, and delivering robust, reliable services with machine learning.

## What you will be doing:

Leveraging machine learning and artificial intelligence subject matter expertise to drive improvements in the Slackbot experience.

Develop ML models supporting ranking, retrieval, and generative AI use-cases.

Brainstorm with Product Managers, Designers and Frontend Engineers to conceptualize and build new features for our large (and growing!) user base.

Produce high-quality results by leading or contributing heavily to large multi-functional projects that have a significant impact on the business.

Actively own features or systems and define their long-term health, while also improving the health of surrounding systems.

Support in the development of sustainable data collection pipelines and management of ML features.

Assist our skilled support team and operations team in triaging and resolving production issues.

Mentor other engineers and deeply review code.

Improve engineering standards, tooling, and processes.

## What you should have:

Experience with functional or imperative programming languages: PHP, Python, Ruby, Go, C, Scala or Java.

Built with common ML frameworks like PyTorch, Tensorflow, Keras, XGBoost, or Scikit-learn

Fine tuned LLMs or BERT models.

Experience building batch data processing pipelines with tools like Apache Spark, Hadoop, EMR, Map Reduce, Airflow, Dagster, or Luigi.

An analytical and data driven mindset, and know how to measure success with complicated ML/AI products.

Put machine learning models or other data-derived artifacts into production at scale.

Led technical architecture discussions and helped drive technical decisions within the team.

The ability to write understandable, testable code with an eye towards maintainability.

Strong communication skills and you are capable of explaining complex technical concepts to designers, support, and other specialists.

## Nice to have:

Expertise in conversational agentic systems.

Expertise in retrieval systems and search algorithms.

Familiarity with vector databases and embeddings.

Knowledge of using multiple data types in RAG solutions including structured, unstructured, and knowledge graphs.

Broad experience across NLP, ML, and Generative AI capabilities.

Unleash Your Potential

When you join Salesforce, you’ll be limitless in all areas of your life. Our benefits and resources support you to find balance and be your best, and our AI agents accelerate your impact so you can do your best. Together, we’ll bring the power of Agentforce to organizations of all sizes and deliver amazing experiences that customers love. Apply today to not only shape the future — but to redefine what’s possible — for yourself, for AI, and the world.

Accommodations

If you need a reasonable accommodation during the application or the recruiting process, please submit a request via this [Accommodations Request Form](https://careers.mail.salesforce.com/accommodations-request-form?_ga=2.139086459.912759425.1690463420-976932181.1684251251).

Please note that Salesforce uses artificial intelligence (AI) tools to help our recruiters assess and evaluate candidates’ resumes and qualifications throughout the recruiting process. Humans will always make any candidate selection and hiring decisions. Please see our [Candidate Privacy Statement](https://www.salesforce.com/en-us/wp-content/uploads/sites/4/documents/legal/Privacy/salesforce-candidate-privacy-statement-december-2024.pdf) for more information about how we use your personal data and your rights, including with regard to use of AI tools and opt out options.

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