Sr. Machine Learning Engineer

About Us

6sense’s mission is to multiply what matters: growth, retention, and efficiency. We envision a future where companies, teams, and people reach their full potential.

People are the heart and soul of 6sense. We serve with passion and purpose, living by our Being 6sense values: Win as One Team, Stay Curious, Do The Right Thing, Own the Outcome, and Create Belonging. Every 6sensor plays a part in defining the future of our industry-leading technology. 6sense is a place where difference-makers roll up their sleeves, take risks, act with integrity, and measure success by the value we create for our customers. We want 6sense to be the best chapter of your career.

6sense is Intelligence for Agentic GTM. We turn every signal — yours and ours — into intelligence that every team, tool, and AI agent can act on and trust. Every day, the 6sense Signalverse™ captures one trillion signals to power AI that pinpoints who’s ready to buy, how to engage them, and when to act. 6sense was named a Leader in The Forrester Wave™: Revenue Marketing Platforms for B2B, Q1 2026.

About the Role

We’re hiring a Senior Machine Learning Engineer to join our AI team, reporting directly to the Head of AI. Signals tell you what happened. Our job is to explain why — and that is the problem you will work on. You will build the intelligence that turns a trillion daily signals into cited, explainable answers about why an account matters, why now, and who is deciding. Your models power products customers use every day, including RevvyAI, our conversational GTM intelligence product, and reach their stack through our APIs and MCP server. This is a build-and-ship role, not a research role. You will own problems end to end, work directly with Product and Go-to-Market, and see your work reach customers. You’ll join a team distributed across the US and India, at a company where AI is the product rather than a feature.

Responsibilities

• Own machine learning problems end to end — from data exploration and modeling through deployment, monitoring, and iteration in production.
• Build NLP, LLM, and agentic systems at enterprise scale, including retrieval-based architectures and multi-agent workflows.
• Develop ranking, recommendation, prediction, and optimization models that are explainable rather than black-box.
• Partner with Product and Go-to-Market to turn ambiguous business problems into shipped capabilities.
• Improve the performance, scalability, and reliability of production ML systems, and help shape AI platform architecture.
• Explain your work clearly to technical and non-technical audiences, and engage with customers when needed.
• Mentor engineers and raise the bar for engineering excellence.

Requirements

• 8+ years of industry experience building and deploying machine learning systems in production, with clear end-to-end ownership.
• Strong foundation in machine learning and applied statistics, with hands-on depth in NLP, transformers, embeddings, and retrieval-based systems.
• Practical experience with modern GenAI tooling such as LangGraph, LangChain, or Amazon Bedrock.
• Strong Python skills and experience building distributed ML pipelines on cloud infrastructure (AWS, Databricks, or equivalent).
• Solid grasp of feature engineering, model evaluation, and MLOps practices.
• A product mindset — you want to build AI products customers use, and you measure yourself on customer impact.
• Excellent communication: you can explain complex technical work clearly, tell the story of what you’ve built and why, and hold your own with product and business partners.
• Comfort with ambiguity and the judgment to drive execution independently.

Nice to Have

• Experience with RAG architectures, vector databases, and prompt engineering.
• Hands-on work with PyTorch or TensorFlow.
• Background in B2B SaaS, enterprise AI products, or forward-deployed engineering — especially where you worked directly with complex customer data and delivered quickly.

Pay

Base Salary Range: $200,349.50 - $260,912.60. The base salary range represents the anticipated low and high end of the base salary range for this position. Actual salaries may vary and may be above or below the range based on various factors, including but not limited to work location and experience. The base salary is one component of 6sense’s total compensation package for this position. Other compensation may include a bonus program or commission plan, and stock options if approved by 6sense’s board.

Benefits

• Health coverage, paid parental leave, generous paid time-off and holidays, quarterly self-care days off, and stock options.
• Equipment and support for remote or in-office work.
• Learning and development initiatives, including access to LinkedIn Learning platform.
• Quarterly wellness education sessions and wellness days.
• Employee Resource Group (ERG)-hosted events celebrating diversity and inclusion.
• 401K employer matching program.
• Life and disability insurance.