[Hiring] Senior Full-Stack Engineer @The Sales Centre co

Role Description

You’ll be the company’s first engineer and technical lead. You’ll own how the platform is built:

• Data model
• Security
• Payments
• Background jobs
• Integrations
• What is safe to go live

Your first big milestone is launching the new platform and moving 60 customers off GoHighLevel without losing data.

You’ll work alongside the product founder, who builds every day using Claude Code. Your job is to guide him, not replace him:

• Shape his briefs
• Catch risks early
• Ensure your work and his don’t collide

A part-time QA analyst tests every release.

What you’ll own

• Technical direction: architecture, data model, security, testing and code review
• Approving everything that ships (the product founder signs off on visual changes)
• Setting up the test framework (Vitest, Playwright, GitHub Actions as a merge gate)
• Foundations: Postgres with row-level security, auth, Stripe billing, background jobs, transactional email and third-party integrations
• The launch and customer migration, including a two-week parallel run
• Production: error tracking, logging, alerts, incident response, performance and cost control
• Documentation, and helping hire and lead the next engineer

Your first 90 days

• Weeks 1–2: get set up, learn the code and build plan, and ship a small fix
• Month 1: become the reviewer for everything that ships and take ownership of security and data protection
• Months 2–3: lead the launch and migrate customers across

Qualifications

• 5+ years as a professional software engineer
• 2+ years building and running a multi-tenant SaaS product in production
• Strict TypeScript, React 19 and the Next.js App Router (Server Components, Server Actions, streaming, caching in Next.js 15/16)
• Strong Postgres skills beyond the ORM: schema design, migrations, indexing, query performance and RLS (Supabase a strong plus)
• Stripe in production: subscriptions, webhooks, idempotency, usage or credit-based billing
• Background jobs and queues (Inngest, Trigger.dev, BullMQ or similar)
• Automated testing as a release gate, CI and Vercel preview deployments
• Production ownership with Sentry or similar
• Daily, disciplined use of agentic AI coding tools (Claude Code preferred; Cursor or Codex fine)
• Experience reviewing others’ code as the gate to production and mentoring less experienced builders

Nice to have

• Building features on LLM APIs (Anthropic or OpenAI)
• Migrating customers and data between platforms
• Working with large external datasets and third-party data APIs
• Multi-tenant security fundamentals (OWASP top 10, secrets, audit logging, UK GDPR)
• GoHighLevel, Resend, MapLibre, SEO and Core Web Vitals

You’ll thrive here if you are

• Happy being the only engineer and picking up work without being told
• Can explain technical risk in plain English with options and a recommendation
• Willing to say when something is a bad idea and back the decision once it’s made
• Ship small and often
• Speak up as soon as something goes wrong

This probably isn’t for you if

• You want a team around you or day-to-day management
• You’d rather stop a non-developer from building with AI than help him do it well
• You’re mainly a front-end specialist
• You’d hold up shipping for weeks over architecture debates