Windsor Harlow Let’s talk

Systems that hold under load.

Every app is only as good as the systems behind it. We design and build APIs, data models, background jobs and integrations that stay fast, secure and understandable as you grow.

StackJavaStackPythonStackNodeStackGo
Discuss your project
What we build

Backend systems.

The APIs, data and integrations behind your product — secure, observable and ready for more customers.

APIs and services

REST and GraphQL APIs with clear contracts, authentication and access control.

Data and storage

Data models, PostgreSQL, caching and file storage designed for the questions you need to answer.

Background processing

Queues and workers for the jobs that shouldn't keep a customer waiting.

Integrations

Connect payments, CRMs, ERPs and third-party APIs so information flows without copy-paste.

What you get

Everything you need to launch — and keep going.

  • Architecture and API design
  • Production-ready services
  • Database design and migrations
  • Authentication and access control
  • Monitoring, logs and alerts
  • Load testing and runbooks
Technology

The stack.

We work in your existing tools where it makes sense.

Languages

JavaSpring BootPythonFastAPIDjangoNode.jsGo

Data

PostgreSQLRedisAmazon S3SQSKafka

Security

OAuth2 / OIDCRBACSecrets managementEncryption

Quality

Contract testsLoad tests (k6)Observability
How We Work

From idea to launch.

01

Define

We agree goals, priorities and a first release worth shipping.

  • Workshops and discovery
  • Architecture review
  • Scoped plan and prototype
02

Build

Working software every week, with demos you can try.

  • Weekly demos
  • Tested release pipelines
  • Decisions written down
03

Operate

We keep it running — or hand it over, fully documented.

  • Monitoring and alerts
  • Runbooks and support
  • Clean handover
Related Work

Built with this.

Engineering labAtlas PlatformDjango · Celery · EKSCloud & product engineeringDocuments in. Work moving.Process large document uploads with background workers and cloud capacity that adapts to demand.
  • Direct file uploads
  • Separate tenant records
  • Distributed processing
Explore the build →Engineering labPolyglot Microservices PipelineJava 21 · Python · JenkinsCloud & platform engineeringTwo languages. One delivery system.One release process for Java and Python services, with security checks and system monitoring.
  • Polyglot services
  • Jenkins delivery
  • Workload security
Explore the build →
Our product

Rune

Our open-source secrets manager. Passwords, keys and tokens stay encrypted, sealed by default and on machines you control.

FAQ

Questions about Backend systems.

Can you work with our existing backend?

Yes. We usually start by mapping what exists, then improve it in safe steps rather than rewriting everything.

How do you handle security?

Access control, encryption and secrets management are part of the design, and reviewed before each release.

Will we be locked in to you?

No. Everything is documented, in your repositories and cloud accounts, with runbooks for your team.

Other services

All services

AI & machine learning

Practical AI features — assistants, search over your documents, automation and predictions — built into your product and measured.

Cloud & DevOps

Cloud platforms defined in code, automated releases, monitoring — and costs you can actually read.

Mobile & app development

Native and cross-platform apps for iOS and Android — designed, released and improved by the same team.

Web products & frontend

Websites, customer portals and web apps that load fast, work for everyone and are easy to grow.

E-commerce & Shopify

Shopify stores, custom storefronts and the integrations behind them — fast to browse, easy to run and ready for busy days.

Salesforce development

Salesforce shaped around how you sell and serve — custom apps, automation and integrations with the rest of your systems.