Full-Stack Engineer (Next.js)

This profile represents one of the most requested shapes in the turnkey.dev network: a full-stack engineer who can carry a B2B product feature from the data model all the way to a polished screen. Small SaaS teams ask for it constantly, because it is one hire instead of two and no handoff in the middle.

Background

Eight years building web products end to end, most of that time in B2B SaaS and logistics, where the software is a tool people use all day and small workflow details matter. Works across the whole stack in one motion: PostgreSQL schema, Node.js and Next.js API routes, and a React front end that respects the design file. Used to small teams where the person who writes the feature also monitors it in production.

What the work actually looks like

B2B products share a set of recurring problems, and this archetype has usually met all of them more than once.

Multi-tenancy. Almost every B2B SaaS puts many customers on one database, which makes tenant isolation the single most consequential design decision in the codebase. This profile has lived with shared tables scoped by a tenant column, knows why every query must be filtered at a layer developers cannot forget, and understands what row-level security in PostgreSQL buys you when a missed filter would mean one customer seeing another’s data. The honest position: a leaked row in B2B is not a bug, it is a churned account, so isolation gets designed in rather than reviewed in.

Auth that enterprise buyers expect. Password login is the easy part. B2B deals start requiring SSO through Google or Microsoft, then SAML or OIDC for larger customers, then role-based permissions with an admin who manages seats, then an audit trail of who did what. This archetype has implemented enough of that ladder to know which rungs to build now and which to defer until a deal actually demands them.

Integrations. Logistics and B2B work means living inside other companies’ APIs: syncing records both ways, handling webhooks that arrive twice or not at all, backing off when a rate limit hits, and building the reconciliation job that catches whatever the happy path missed. The experienced version designs every sync assuming the other side will be down at the worst moment.

Dashboards and reporting. B2B buyers judge the product by its dashboard. That means aggregation queries that stay fast as data grows, sensible caching so the page does not hammer PostgreSQL on every load, and charts that answer the customer’s question instead of decorating the page. This profile treats a slow dashboard as a database problem first and a front-end problem second.

Next.js used deliberately. Marketing and docs pages render statically. Dashboards behind login render on the server or the client depending on what the page does, not on what the framework’s release notes are excited about this quarter. API routes handle the thin backend most B2B apps need, and this archetype knows when the product has outgrown them and deserves a separate service.

Seniority signals to look for

When you interview for this shape, the strong candidates separate from the average ones in predictable ways:

• Ask how they would model tenants and permissions for your product. Strong candidates ask about your customers first, because the right answer depends on whether you sell to five enterprises or five thousand small teams.
• Ask about a webhook or sync integration they maintained. Listen for retries, idempotency, and reconciliation. If the story ends at “we called the API and it worked”, the experience is shallow.
• Ask what they do when a designer’s file conflicts with a technical constraint. The good answer involves a conversation, not silent deviation in either direction.
• Ask which Next.js features they avoid. An engineer with real production time has a list and reasons; an enthusiast has neither.

Typical engagement

Usually joins as the primary or second product engineer on a B2B SaaS team, full time or close to it. Fits best where the roadmap is a queue of customer-driven features and integrations rather than a greenfield rebuild. West coast US hours with strong overlap across North America. Available now.

This is a representative sample of the vetted pool. Request it and we confirm real, current availability for a developer with this background.