Senior FullStack developer (long term, contract)

Selecto; Barcelona; Remote; EUR 70,000 - 110,000; Full time

Job summary

Selecto is seeking a Senior FullStack Developer to join an AI-powered platform handling users, roles and permissions in a complex, finance-sensitive environment. You will shape architecture, drive integrations with providers like Salesforce and Xero, and mentor engineers.

This remote, Europe-focused role offers 40 hours/week and long-term engagement with possible on-site visits. Expect collaboration with PMs and design, strong emphasis on security, and building scalable schema-driven systems for

Qualifications

• Extensive experience building complex, scalable web apps.
• Strong emphasis on security and access control.

Responsibilities

• Own architectural decisions for a large, actively evolving codebase in a finance/compliance-sensitive domain.
• Lead integration work with external providers (CRM, accounting, card issuance).
• Review code with a security-first eye, particularly on permission/access-control gaps.
• Maintain the project's Memory Bank and feature-level documentation practices.
• Participate in on-call/production support.
• Mentor engineers and set technical guardrails for non-engineering contributors.

Skills

Fullstack development

Next.js

TypeScript

PostgreSQL

Auth/OIDC

Docker

Azure

CI/CD

Security review

Team leadership potential

Tools

Drizzle ORM

Zod

NextAuth.js

Keycloak

Terragrunt

GitHub Actions

Docker

Azure Container Apps

pgvector

Job description

We are looking for a skilled Senior FullStack Developer who is ready to take on a Team Lead position soon and join an exciting and complex project.

Description: An AI-powered platform for managing users, roles, and permissions. It handles identity verification (KYC/KYB), a rewards/points system, and connects with CRM, accounting, and card-issuing tools. It's genuinely complex - not just a simple database app.

English Proficiency:Upper-Intermediate / B2+ (client-facing communication required)

Team: Project Manager, Product Designer, 2 FullStack developers, Support Engineer.

Expected Working Hours: Full-time, 40 hours/week.

Location: Remote, Europe only.Preference for Western Europe (occasional on-site visits may be required); candidates from Eastern Europe will also be considered.

Engagement Duration: 6–12+ months (long-term).

Technology Stack:

• Next.js 15 (App Router) + TypeScript, tRPC
• PostgreSQL + pgvector via Drizzle ORM, Zod
• NextAuth.js + Keycloak (OIDC/OAuth2)
• Tailwind + shadcn/ui
• Docker, Azure Container Apps, Terragrunt + GitHub Actions

Skills:

• Schema/metadata-driven system design (this project uses per-role schema overlays across 11 distinct roles, not off-the-shelf RBAC).
• JSONB-based PostgreSQL modeling.
• Strong code review instincts around authorization/access control.
• Integrating multiple third-party APIs with graceful handling of partial failures.
• DevOps-adjacent comfort (Docker, IaC, CI/CD, Azure).

Responsibilities:

• Own architectural decisions for a large, actively evolving codebase in a compliance- and finance-sensitive domain (KYC/KYB, points/rewards economy, card issuance).
• Extend the generic-entity/schema system without regressions.
• Lead integration work with external providers (SmartSearch, Salesforce, Xero, Pannovate, SendGrid).
• Review code with a security-first eye, particularly on permission/access-control gaps.
• Maintain the project's Memory Bank and feature-level documentation practices.
• Participate in on-call/production support.
• Responsible for managing the DevOps part of the project
• As the role matures, mentor other engineers and set technical guardrails for non-engineering contributors working directly in the codebase via AI tools.