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.

The Job

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.