Northwind Pay
We built a double-entry payments core with idempotent transfers, real-time reconciliation, and a multi-currency wallet — cutting settlement errors to zero and handling 4× volume without a rewrite.
Trusted by finance teams worldwide
Design. Build.
Secure. Scale.
From ledgers and payment rails to trading dashboards and audit trails, we partner with you at every step — and stay on the hook after launch.
Senior-only team
No junior devs learning on your production ledger. Everyone here has shipped money-moving code before.
Transparent delivery
Weekly progress, real numbers, and access to the engineers who wrote the code — not a status you can’t verify.
Scalable teams
Spin capacity up for a launch, down for maintenance. You pay for the work, not the bench.
Relentless correctness
Reviews, automated tests, and reconciliation on every deliverable. We ship when the numbers balance.
Selected work
worth a closer look
Meridian Markets
A low-latency trading dashboard that stays honest when volume triples at the open — live order flow, sub-second charts, and an audit trail regulators can read line by line.
Keystone Credit
An underwriting and loan-servicing platform wired to the client’s actual risk policy — configurable scorecards, KYC/AML flows, and reporting that survived a regulator’s line-by-line review.
Services we provide
for your business
Product & Design
User-focused interfaces for complex financial workflows — where clarity prevents costly mistakes.
- Responsive layouts for every device
- Dashboards that make data legible
- Brand-aligned design systems
Engineering
Scalable, maintainable systems built with proven technology — fast, observable, and rock-solid.
- Clean, modular, tested codebases
- API-driven architecture
- Automated testing & CI/CD
Reliability & Compliance
The boring stuff that matters: uptime, security, audit trails, and deploys that don’t need a war room.
- 24/7 monitoring & alerting
- KYC/AML & immutable audit logs
- Regular security patches
Tools we use
to build your product
Go
Concurrent, fast services
Rust
Safety-critical components
PostgreSQL
Transactional data store
Kafka
Event streaming backbone
React
Declarative UI library
Node.js
Scalable network runtime
AWS
Cloud infrastructure
Kubernetes
Container orchestration
Grafana
Observability & metrics
Vault
Secrets & encryption
Our numbers
speak for themselves
75+
Projects delivered
Custom financial software shipped to production.
50+
Clients worldwide
Trusted across banks, startups, and fintechs.
10K+
Hours saved
Automation that removed manual, error-prone work.
99.9%
Uptime
Reliable platforms that stay up when it counts.
Our partners can
tell you even more
“They delivered a payments core on time, communicated clearly every step, and scaled the team as we grew. We couldn’t have launched so quickly without them.”
“Their end-to-end approach gave us clarity. The designers nailed our brand and the engineers built a rock-solid backend. User satisfaction jumped 35% in a quarter.”
“GSFintech feels like an extension of our team. Proactive maintenance kept us at 99.9% uptime, and we still count on them for every new feature.”
Ready?
Let’s talk.
Send us the ugly version — the outage, the deadline, the audit, the codebase nobody wants to touch. A senior engineer replies within one business day.
- Designed for user experience, built for results
- From concept to launch — seamless execution
- Reliable support & continuous improvements