Software engineering studio

We build software that moves businesses forward.

Spellegrino Key is a senior engineering team designing and shipping resilient platforms, web products and bespoke integrations for clients who care about craft.

Talk to an engineer See what we do
  • ⟢ Bespoke platforms
  • ⟢ Cloud-native architecture
  • ⟢ Web & mobile products
  • ⟢ Data & integrations
∞ Lines of carefully reviewed code
⌁ Senior-only engineering pods
◇ Long-lived products in production
★ Trusted across multiple industries
Services

Engineering across the full product lifecycle.

From early architectural decisions to long-term operations — one accountable team that owns the outcome.

Custom software development

Web platforms, internal tools, SaaS products and bespoke back-office systems — engineered to evolve gracefully.

  • TypeScript
  • Node.js
  • React
  • Next.js

Cloud architecture & DevOps

Production-grade infrastructure, CI/CD pipelines, IaC and observability — designed for reliability at scale.

  • AWS
  • Hetzner
  • Docker
  • Terraform

System integrations

Connecting payment, CRM, ERP and bespoke APIs into one coherent system — with idempotency and audit trails baked in.

  • Stripe
  • REST
  • GraphQL
  • Webhooks

Security & compliance

Hardening reviews, secrets hygiene, audit-ready logs and GDPR-aware data flows — security treated as a feature.

  • GDPR
  • OWASP
  • SSO
  • Audits

Data & analytics

Pipelines, warehousing, dashboards and event tracking that surface the metrics decision-makers actually use.

  • Postgres
  • BigQuery
  • dbt
  • Metabase

Product engineering

Discovery, prototyping and iterative delivery — moving from a rough idea to a polished product without losing momentum.

  • Discovery
  • UX
  • MVP
  • Iteration
How we work

A small, senior team, end-to-end ownership.

No layers, no hand-offs, no surprises. The engineers who scope your project are the same ones shipping it.

  1. 01

    Discover

    We sit with the problem first — stakeholders, edge cases, constraints — before drawing a single box.

  2. 02

    Design

    Lightweight architecture docs, clear interfaces, and a roadmap that fits delivery to risk.

  3. 03

    Build

    Short iterations, peer-reviewed code, automated tests, and demos that mean something.

  4. 04

    Operate

    Observability, on-call discipline, postmortems — software is a living thing, we treat it like one.

Stack

Tools we reach for.

We're pragmatic, not religious. The tech serves the product — never the other way round.

Work

A glimpse of recent engagements.

Under NDA in most cases — here's the shape of the problems we love.

Fintech

Multi-currency ledger

Event-sourced ledger backing payments across several markets — built for auditability and replay.

Logistics

Fleet operations platform

Real-time dispatching, telemetry ingestion and a driver-facing app — single codebase, regional deploys.

SaaS

Multi-tenant analytics

Per-tenant isolation, role-aware dashboards and an embeddable widget set for partner products.

Marketplace

Trust & safety pipeline

Risk scoring, manual review queue and policy versioning — designed with operations teams in the room.

Healthtech

Clinical workflow tooling

Care-team coordination with strict access controls and an auditable history of every change.

B2B

Legacy modernisation

Strangling a monolith into well-defined services without freezing the product roadmap.

"They don't just write code. They take ownership — of the architecture, the trade-offs, the operations. The kind of partner you want when the stakes are real."
— CTO, fintech client
Get in touch

Let's build something worth keeping.

Tell us about the problem — we'll get back within one working day with honest first thoughts.