Software · Platforms · Infrastructure
Granpay focuses on engineering, product delivery, and integration: multi-currency and FX logic, ledger and workflow tooling, APIs, and the kind of resilient software operators need when they scale a regulated stack. We are a build partner, not a consumer-facing money brand, so language stays precise and expectations stay aligned with what your licences and risk model allow.
Get in touchWe scope each engagement in writing: deliverables, interfaces, environments, and who owns production support after go-live. Below are typical workstreams for platform teams and programme managers.
Greenfield builds and major refactors: domain modelling, service boundaries, release cadence, and documentation your internal team can inherit. We align naming, events, and data contracts early so integrations do not become an afterthought.
Public and partner-facing APIs, webhook design, idempotency, and connector patterns to processors, banks, and identity vendors. We emphasise trace identifiers, structured errors, and contract tests so regressions surface before production.
Rate sourcing, conversion rules, rounding policies, and ledger postings that stay explainable to finance and auditors. We help you encode cut-offs, holiday calendars, and exception handling without hiding state in ad hoc scripts.
Double-entry or event-sourced designs, balance snapshots, suspense handling, and tooling for ops teams to investigate breaks. The goal is systems that match external statements and your own books without manual spreadsheet bridges.
Audit trails, role-based access, segregation of duties hooks, and integration points for KYC and AML tooling where your policy requires them. We do not replace your counsel or MLRO, but we implement controls they can review.
Hardening passes, observability (metrics, logs, traces), runbooks, and knowledge transfer so your team can operate what we ship. We can pair on incident drills and capacity assumptions before you sign off a launch.
Our work sits next to banks, fintechs, and programme managers who need custom routes to market: from early architecture through to hardening, observability, and handover. That can mean core services around balances and conversion, orchestration for cross-border settlement, card and wallet experiences, or automation that fits your compliance story.
Crypto-adjacent and treasury-style features are in scope only where regulation, custody, and risk controls are explicit in the mandate. Scope, entity, and jurisdiction always shape what we ship. We help you document assumptions, trace money movement in software, and keep audit-friendly seams between systems.
If you are a product owner or CTO comparing build partners for import/export tooling, marketplaces, B2B SaaS with a financial layer, or specialist real-estate treasury software, send a short brief and we will reply with a sensible next step.
For engineering partnerships, platform builds, integration work, or general product enquiries.