Senior Full-Stack Engineer — Business Workflow Platforms

Location: Remote · Must work core hours in U.S. time zones

Employment Type: Full-time · Available as contract (Talent on Demand)

Works with: Lead Developer, alongside the client's in-house engineering team

About the Company

We are a rapidly growing U.S.-based, AI-native product studio. We take companies from idea to launch-ready software in weeks, then partner with them through fast, two-week sprints to build and scale production systems. We have shipped 200+ products and hold a high bar on engineering quality even as we move quickly. Our team is fully distributed, and every engineer owns meaningful, visible work.

About the Role

We are building workflow-heavy business software for one of our clients, inside an existing production codebase shared with the client's own engineering team. We need a full-stack engineer who can safely extend a live system — adding tables, permissions, and workflows without breaking what is already running — and ship four to five features per two-week sprint.

This is an AI-first environment. Tools like Cursor, Claude Code, and coding agents write most of the first draft; you direct them, review every diff, and own what ships. Speed here comes from tooling and judgment, not from skipping tests, reviews, or acceptance criteria. We are looking for a genuine engineer who uses AI to go faster, not someone who leans on it in place of craft.

Key Responsibilities

Backend & Data Model

Extend an existing production backend and data model — adding tables, permissions, and workflows without breaking live features
Write data migrations from legacy sources, with reconciliation and duplicate review

Workflow & Business Logic

Build server-side business rules: state machines, approval gates, independent review steps, and versioned records that keep full history
Build a shared task engine with owners, backups, due dates, deduplication, and completion evidence

Security & Access Control

Implement role-based access control scoped by company and assignment, enforced at both the database and the API
Build an append-only audit log, stale-write protection, and idempotent endpoints so retries never create duplicates
Build secure file upload and storage with versioning, malware scanning, and time-limited access links

Integrations & APIs

Integrate email and SMS providers with templates, delivery tracking, retries, and opt-out handling
Design and build the sync and submission APIs that the companion mobile app depends on

Web Interface & Tooling

Build work queues, bulk assignment tools, and dashboards in the web interface

Reliability & Delivery

Add monitoring and alerting, run access reviews and restore tests, and load test before launch
Work through branches, code review, and feature flags alongside a second engineering team in the same repo

Required Qualifications

4+ years building and shipping full-stack web applications to production
Strong relational database skills: schema design, migrations, query performance, and data integrity
Experience with role-based access control, audit logging, and multi-tenant data isolation
Comfort reading and extending a large codebase you did not write, adapting quickly to its stack and conventions
Experience building workflow-heavy business software: queues, state machines, approvals, and tasks
Experience with idempotent APIs, retries, and concurrency (stale-write protection, duplicate prevention)
Integration experience with email and SMS providers and file storage
Daily, hands-on use of AI coding tools (Cursor, Claude Code, or similar) on production work, with a workflow you can walk us through
A track record of shipping fast without lowering the bar: automated tests, CI, and reviews that catch what AI gets wrong
Strong written and spoken English — clear pull requests, precise questions, and the ability to explain tradeoffs to a client team
Able to work core hours in U.S. time zones

Preferred Qualifications

Experience with heavily regulated workflows
Experience setting up agent workflows, project rules, or custom prompts that make a whole team faster with AI
Experience migrating messy legacy data
Experience working inside another team's codebase as an outside vendor
Spanish (the platform is bilingual, though it is not required)

Ideal Candidate Profile

You are a strong engineer who is fast because you have mastered your tools, including AI — not because you cut corners. You are comfortable being dropped into a live codebase you did not write, and you make changes that do not break things. You think in systems: permissions, edge cases, concurrency, and what happens on a retry. You write clearly, ask precise questions, and can hold your own in front of a client's engineering team. You would rather own a problem end to end than wait for a fully specified ticket.

Why Join Us

You will build real production systems used by real businesses, ship visible work every sprint, and work inside a lean, high-caliber team that trusts your judgment. If you want to work at the frontier of AI-assisted engineering without lowering your standards, this is that seat.

Senior Full-Stack Engineer (Business Workflow Platforms) - 21906