Founding Engineer — private wealth platform (TypeScript/Next.js)

Twyce Holdings is hiring a founding engineer for our private wealth platform.

We are building a private-wealth product that consolidates holdings across institutions into one auditable picture. There is an existing TypeScript/Next.js front end; you are here to productionise the first real version behind it.

This is a security-and-data-engineering role before it is an LLM role. The hard parts are the ledger and the ingestion path, not the model.

What you will own

• A bitemporal ledger with full provenance — every figure traceable to the statement, feed or correction it came from.
• Statement ingestion that survives hostile input: untrusted PDFs and exports from many institutions, normalised into one auditable model.
• Tenant isolation that is tested, not merely designed.
• A reconciliation and review queue, so breaks surface to a human instead of silently resolving.
• Institution and market data integrations, with sensible failure behaviour when a source is late, wrong or down.

What strong looks like

• Strong TypeScript, and real comfort in the data layer — Postgres, schema design, migrations, correctness under concurrency.
• You have built something where getting the data model wrong would have been expensive, and you can explain how you modelled time and corrections.
• Security instincts: authentication and authorisation boundaries, secrets handling, least privilege, and an honest account of how you have tested isolation.
• Financial or regulated-data experience is a strong plus; obsessive care about reconciliation matters more than domain vocabulary.

How we work

Remote and async-first, with meaningful UK/Europe overlap. An internal agent fleet removes admin and accelerates research, implementation and QA — but you own engineering judgment and every production outcome. Code, infrastructure accounts and documentation stay business-owned, so no individual becomes a single point of failure.

Revenue-funded, not runway-funded. The first design partners are warm.

Process

Intro call, then a paid trial task (~4 hours, paid at £150–250), then a 30-minute live session where you extend your own submission, then terms.