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FyxerFyxer

Senior Customer Support Engineer

Own and resolve complex technical customer-support issues for an AI SaaS product, using APIs, SQL, logs, and production tooling while improving escalation quality and senior-agent capability. The role requires 3+ years of technical SaaS or cloud support experience and strong customer communication.

About the job

Responsibilities

  • Own complex technical support tickets end to end, from initial report through resolution, including customer communication.
  • Investigate issues using product tools, APIs, SQL, logs, and production data.
  • Determine whether an issue is a bug, incident, or user error, and assess its blast radius.
  • Write actionable Engineering escalations and follow them through to completion.
  • Identify recurring issues and create trackers before patterns grow.
  • Build runbooks, saved queries, and knowledge resources to reduce escalations.
  • Upskill senior support agents and improve their technical capability.
  • Use AI tools in investigations and verify their outputs before customer impact.

Requirements

  • 3+ years of experience in a technical support role within a SaaS or cloud-based company.
  • Fluency with APIs, including authentication and interpreting HTTP errors such as 401 and 500.
  • Ability to write SQL independently and understand unfamiliar database schemas and joins.
  • Comfort working with logs, tracing requests across services, and troubleshooting from errors.
  • Strong written communication, especially with unhappy customers.
  • Experience with customer support and issue-tracking tools such as Zendesk, Intercom, Jira, and Linear.
  • Adaptable, fast-moving, and hands-on startup approach.
  • Production engineering experience and a computer science degree are not required.

Compensation & Benefits

  • Salary: £65,000–£75,000.
  • Hybrid schedule based in the London office Monday through Thursday, with Fridays from home.
  • Standard office hours.
  • On-site gym, private medical insurance, pension, and lunch provided every day.

Hiring Process

  • CV review.
  • Initial hiring-team call about experience and motivation.
  • Head of Customer Support interview focused on technical thinking.
  • Live technical exercise using an example application, database, API, logs, and customer tickets.
  • Team interviews.

Skills

API, SQL, Http, Authentication, Production Logs, Zendesk, Intercom, Jira, Linear, Cursor, Incident Management

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