Senior SQL developers for finance and fintech teams, based in the US

Frequently asked questions

What SQL data types should financial applications use for money?

Use exact numeric types such as DECIMAL or NUMERIC with precision and scale chosen for your instruments and calculations. Floating-point types are generally unsuitable for amounts requiring exact decimal representation. Store currency explicitly, define rounding boundaries, and test aggregation behavior. Integer minor units can work for some systems, but fractional pricing and currency conventions need attention.

How should a SQL database support a double-entry ledger?

Model journal entries and their postings so each completed entry balances under your defined accounting rules. Use transactions to commit related postings together, and enforce appropriate uniqueness and referential constraints. Posted corrections typically use reversal or adjustment entries rather than silent overwrites. Balance validation may require controlled posting procedures because ordinary row constraints cannot enforce every cross-row invariant.

How can SQL reconciliation handle duplicate or missing transactions?

Preserve source identifiers, ingestion timestamps, and matching status so reconciliation can distinguish duplicates from legitimate repeated amounts. Apply unique constraints to stable source keys where appropriate. Build exception queues for unmatched records instead of forcing uncertain matches. Reprocessing should be idempotent, with traceable adjustments and clear cutoffs for late-arriving settlements or corrected source files.

Can an external SQL developer work within our SOC 2 controls?

NextGen Coding Company is comfortable working inside a client's SOC 2 security controls. Define approved access paths, least-privilege database roles, change-review requirements, and logging expectations before work starts. We sign an NDA and full IP assignment before touching code. All engineers live and work in the US, and there is no offshore subcontracting.

How do SQL developers keep financial reports consistent during updates?

Choose isolation and snapshot boundaries based on what the report must represent. PostgreSQL repeatable-read transactions and SQL Server snapshot isolation can support consistent reads, but their operational tradeoffs differ. Define cutoff times, late-posting rules, and replica-lag tolerances. Avoid treating SQL Server NOLOCK as a reporting fix; it can return uncommitted or otherwise inconsistent results.

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.