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Senior Full Stack Engineer

kernel.ai Logo

Kernel

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Location:
United Kingdom , London

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

110000.00 - 170000.00 GBP / Year
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Job Description:

Kernel provides enterprise RevOps teams with AI-powered company data for their CRMs. We raised $14M in Series A funding from top VCs and operators at Plaid, OpenAI, and Slack to build an AI-native alternative to Dun & Bradstreet's entity and hierarchy data. RevOps teams at Navan, Gong, Mistral, and AlphaSense use Kernel to run their organizations. At Kernel, we process 7B+ tokens a day and run 1.8M+ agents daily, all on an architecture that’s intentionally simple: one database, one queue. It’s minimalism built for massive scale (For reference, Wikipedia has 2.3B tokens in the English wikipedia). Our queue processes a daily volume on par with the entire Visa network’s transactions (~365M/day). All of which has been built by a small but mighty team of engineers.

Job Responsibility:

  • Owning and scaling Kernel’s back-end infrastructure (AWS, NodeJS, Postgres, n8n)
  • Designing systems that process millions of accounts, terabytes of data and thousands of parallel executions
  • Building reliable, scalable data pipelines and services for enterprise customers
  • Rapidly shipping features to users and to our internal team
  • Continuously evaluating code, infrastructure and processes to find improvements
  • Automating manual processes to increase speed and reliability
  • Sharing feedback on roadmap direction and ideas on bets to place and potential solutions
  • Ensuring a world-class, scalable back-end infrastructure
  • Working daily with the team to move us toward our next goal
  • Implementing mass-action workflows that clean, enrich and complete CRM data
  • Establishing robust monitoring, observability and reliability practices
  • Partnering with product and solutions engineering to translate business logic into safe mass actions in customer CRMs

Requirements:

  • 6+ years of software or product engineering experience
  • Strong experience building and scaling production systems
  • Comfort with backend engineering (NodeJS, Postgres, TypeScript)
  • Strong understanding of LLM application development patterns (RAG, prompt engineering, consistency testing)
  • Ability to operate autonomously in a small, high-velocity team
  • Excellent communication and collaboration skills
  • Some experience with Kubernetes or distributed systems

Nice to have:

  • Experience working on AI-driven or data-heavy products
  • Frontend experience (NextJS, React, TypeScript)
  • Understanding of CRM data models or workflow automation
What we offer:
  • Equity
  • 24 days holiday per year + bank holidays
  • 2 weeks work-from-anywhere
  • Pension plan
  • Top-spec equipment and central London office
  • Free dinner at the office
  • Team events and dinners
  • Work directly with the founders to scale the systems that power enterprise AI
  • Visa sponsorship and relocation support for exceptional candidates

Additional Information:

Job Posted:
February 21, 2026

Employment Type:
Fulltime
Work Type:
On-site work
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