Remote Fullstack Engineer (AI Experience)

Top 3 reasons to join us

• Gain very attractive salary and benefits;
• Be a developer, not a coder;
• Excellent environment and team to help you grow.

Job description

An AI-native platform that lets Swiss fiduciary firms manage client bookkeeping, payroll and compliance through a WhatsApp-first workflow, backed by a Next.js/Supabase application and n8n automation. We’re hiring a backend-leaning full-stack engineer to close a critical security backlog, stabilise the platform for production use, and lay the operational groundwork, CI/CD, observability, staging are needed to onboard more customers safely. You will work directly inside the existing single-contributor codebase, take full ownership of the n8n automation layer, and be one of two engineering hires driving the technical roadmap (the other being an AI/Agent Engineer).

Responsibilities

• Remediate the platform’s active security exposure: enforce authentication and row-level security (RLS) on every API route; close public database policies exposing payroll and client data; fix a tenant-isolation bug that allows cross-tenant access
• Replace n8n’s direct database master-key access with an authenticated ingestion API that derives tenant identity server-side, removing the single largest operational risk in the automation layer
• Design and implement a background job queue for heavy, currently synchronous document processing (PDF/XLSX extraction, multi-account imports) to remove request-timeout failures
• Make cloud storage private (signed URLs, UUID paths) and put the database schema into version control, paired with a real staging environment
• Build CI/CD pipelines, automated tests, including tenant-isolation regression tests and baseline observability (logging, monitoring, alerting)
• Harden and maintain the n8n workflows that run the WhatsApp document-intake and accounting-automation flows, including error handling, idempotency, and a dead-letter/retry path
• Implement data-subject-rights tooling (export/erase) and an append-only accounting ledger with reversal entries, in coordination with the company’s external data-protection advisor
• Redact personal data from application logs and enforce least-privilege access patterns throughout the stack
• Collaborate with the AI/Agent Engineer on backend integration points for the LLM-driven agent, tool authorization checks, audit logging of agent actions. 

Your skills and experience

• 4+ years of professional experience with Node.js/TypeScript in production backend systems
• Strong hands-on experience with Next.js (App Router) and building/maintaining REST and webhook APIs
• Deep, practical knowledge of PostgreSQL, including Row-Level Security (RLS) policy design and multi-tenant data isolation
• Production experience with Supabase, or an equivalent BaaS (Firebase, AWS Amplify), auth, storage and database
• Experience with n8n, Zapier, or a comparable workflow-automation tool, ideally including securing/hardening automations that touch production data
• Working DevOps fluency: CI/CD pipeline design (GitHub Actions or equivalent), staging environments, secrets management, and basic monitoring/alerting setup
• Solid understanding of authentication/authorization patterns and common web-application security pitfalls (mass assignment, privilege escalation, injection)
• Comfortable working in and improving a codebase with minimal existing test coverage or documentation. You will be establishing the engineering discipline, not just following it
• Clear written communication in English; able to work asynchronously across time zones.

Nice to have 

• Experience with Swiss or EU data-residency / GDPR-driven architecture decisions
• Familiarity with double-entry accounting systems, or fintech/regtech products generally
• Experience integrating LLM-based agents into a production backend (tool-calling, audit trails)
• Prior experience as the sole or lead engineer on a live production system (start-up background)

Why you'll love working here

You’ll love working here!

• Competitive salary package.
• Mon-Fri, flexible remote working.
• 12 days of annual leave and 3 additional special holidays (Swedish National Day, Christmas Eve & your Birthday).
• Annual leave increases with loyalty.
• Premium health care package for employees & family members.
• English, professional working environment.
• Opportunities to gain hands-on experience in cutting-edge technologies.