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Frequently asked questions

How should a TypeScript finance application handle money accurately?

Avoid ordinary floating-point arithmetic for monetary calculations that require exact decimal behavior. Use integer minor units where appropriate, or a decimal library such as decimal.js with PostgreSQL NUMERIC columns. Define currency precision and rounding rules explicitly, and test serialization boundaries so API consumers do not silently convert exact values into imprecise numbers.

How do we make financial transaction APIs safe to retry?

Use idempotency keys backed by durable storage and uniqueness constraints, rather than an in-memory flag. Define how repeated requests return the original outcome and how conflicting payloads are rejected. In NestJS or Express, keep validation separate from transactional writes, and test concurrent requests plus failures between database updates and external calls.

Can TypeScript developers work within our SOC 2 controls?

We're comfortable working inside a client's SOC 2 security controls. Before access begins, clarify your approval process, repository permissions, development environment, and change-review requirements. For TypeScript services, discuss dependency scanning, secret handling, and production access boundaries. This describes working within your controls, not a claim that NextGen holds SOC 2 certification.

What matters when integrating Plaid into a TypeScript backend?

Keep access tokens on the server, validate incoming webhooks, and model connection states explicitly. For transaction synchronization, persist cursors and handle additions, modifications, and removals rather than assuming every response is new data. Plan for reauthentication and institution outages, and test reconciliation behavior with controlled fixtures alongside Plaid's sandbox.

How should we interview a TypeScript developer for finance software?

Use a small reconciliation or transaction-state exercise instead of only language trivia. Ask about decimal arithmetic, PostgreSQL transaction boundaries, authorization checks, and logs that avoid exposing sensitive account details. Our engineers are senior; many have 10+ years of experience. Book a 15-minute call to discuss the role and matching process.

Are your developers really based in the US?

Yes. Every engineer lives and works in the United States. No offshore subcontracting and no hand-offs to another team. That's written into the contract.

How fast can someone start?

Most teams interview matched engineers within a week of the first call. Start dates depend on your interview process.