Senior Full-Stack Developer (Remote)
RemoteSweden
SwedenRemoteFull TimeSenior Level
Full TimeSenior Level
Job Summary
Build the CoSeller WebOps site factory, automating website delivery via agent-driven loops that generate pull requests and manage live deployments. Engineer the SEO and GEO agent engine to handle technical audits, structured data, and AI-visibility tracking across WordPress, HubSpot, and Webflow sites. Integrate LLMs like Claude and OpenAI into production workflows for content generation and decision-making, while connecting ad platforms and marketing APIs to replace manual operations. Design scalable backend systems using Node.js, TypeScript, and modern frameworks to support multi-tenant architectures and fleet dashboards.
Required Qualifications
- 5+ years of experience as a developer, with a track record of senior-level ownership
- You've shipped production code used by real customers in a SaaS or corporate software environment
- Hands-on experience building AI agents or agentic systems that run in production
- Experience working with marketing, advertising, or SEO tooling and APIs — e.g. ad platform APIs, Search Console, GA4, or marketing automation systems
- Advanced daily use of AI-augmented development tools (Claude Code, Cursor, or similar)
- Strong backend skills: Node.js, TypeScript, REST/GraphQL APIs
- Experience shipping production websites and web apps — React plus a modern framework like Next.js or Astro, MongoDB or PostgreSQL, Git-based workflows and CI/CD
- Fluent English, spoken and written — you'll work directly with our international team
- Availability for at least 3–4 hours of daily overlap with Central European Time — you'll collaborate closely with our team in Sweden
- Reliable, proactive, and comfortable working independently in a remote-first team
Desired Qualifications
- Big plus: you've built or operated a multi-site, multi-tenant, or Website-as-a-Service platform before — many sites, one template, one team
- Technical SEO and GEO chops: structured data/JSON-LD, Core Web Vitals, sitemaps, and an understanding of how content surfaces in AI answers
- Experience working with CMS APIs (WordPress, HubSpot CMS, Webflow)
- A background in digital marketing, SEO, or paid media before (or alongside) your development career
- Experience with outbound/CRM systems or sales automation
- Familiarity with AWS services (Lambda, S3, CloudFront)
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