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Developer Ecosystem

Open Marketplace Developer Platform

A marketplace serving millions of sellers could not build every tool those sellers needed, and had no way for anyone else to build them either. We architected and delivered the platform that opened it: a sandboxed runtime for third-party applications, the integration and session services that let them behave like part of the marketplace, and the lifecycle tooling to submit, approve and publish them.

Global marketplace with millions of buyers and sellers

10,000+

Developer signups, year one

500+

Apps published

3×

Seller efficiency

Zero

Security breaches

The challenge

No route in for third parties
The marketplace had no infrastructure for integrating third-party applications with its core systems.
A high barrier for developers
Anyone wanting to extend marketplace functionality faced entry costs steep enough to prevent an ecosystem forming.
Seller tools that could not all be built in-house
Business sellers needed specialized tooling in more variations than the marketplace could ever build itself.
An unused developer community
A global developer population existed and had no way to contribute to the platform.

How we approached it

  1. 1Discovery and planning
  2. 2Framework implementation
  3. 3Quality engineering
  4. 4Developer enablement
Four phases in sequence. Quality engineering had to follow the framework and precede enablement — inviting outside developers onto a runtime whose isolation was unproven would have been the wrong order. The engagement records no overall duration.
  1. 1

    Discovery and planning

    Design the platform and the team that would build it.

    • Architectural analysis of marketplace integration requirements
    • Third-party developer workflow and use-case studies
    • Security and compliance framework design
    • Phased roadmap and specialist staffing
  2. 2

    Framework implementation

    Build the runtime and the services a third-party app needs to behave like a first-party one.

    • Sandboxed execution environment with API gateway and permission management
    • Integration service: request proxying, content transformation, rate limiting
    • Session service: distributed sessions, single sign-on, state synchronization
    • Module lifecycle: submission, approval, provisioning and deployment
  3. 3

    Quality engineering

    Prove the isolation holds before opening it to outside code.

    • Unit, functional and system test coverage
    • Integration testing against marketplace systems
    • Performance and scalability validation
    • Security penetration testing
  4. 4

    Developer enablement

    An ecosystem forms only if building for it is straightforward.

    • Developer guides with sample applications
    • API reference documentation
    • SDKs for multiple languages
    • Developer portal

How it was built

Used by

  • Third-party applications
  • Seller-facing marketplace
  • Developer portal

Sandboxed application platform with API gateway, integration and session services

Connects to

  • Marketplace core systems
  • OAuth 2.0 authorisation
  • Application catalog and discovery
Everything third-party crosses the gateway. Nothing outside reaches marketplace systems directly, which is what let the platform open without widening its attack surface.
Sandboxed runtime
Third-party code executes in isolation, which is the property that makes running it against a live marketplace defensible at all.
Integration service
Proxies and sanitises traffic between the marketplace and third-party apps, and enforces rate limits and quotas at the boundary.
Distributed sessions
Single sign-on and state synchronization across applications, so moving into a third-party app is not a second login.
Discovery
A searchable catalog with ratings, plus contextual placement and A/B testing — an app nobody can find is not in an ecosystem.

Technology stack

Enterprise JavaService-oriented architectureOAuth 2.0RESTful web servicesDistributed session managementContainer orchestrationMessage queues

What it delivered

Ecosystem

10,000+ developer signups
Within the first year of platform launch.
500+ applications published
A working ecosystem of seller tools rather than a handful of demonstrations.
3× seller efficiency
Through the specialized third-party applications the platform made possible.
Hundreds of new features
Delivered by third parties rather than the marketplace’s own roadmap.

Business

A new revenue stream
Platform fees and revenue sharing, which did not previously exist.
Improved seller retention
Sellers stayed where the tooling fitted their business.

Technical

99.9% platform uptime
Against a service third-party businesses depend on.
Sub-100ms API latency
Integration fast enough to sit in a user-facing path.
Zero security breaches
Across a platform deliberately running outside code.
Invisible integration
Third-party apps behave as part of the marketplace to the end user.

While others deliver consulting, we deliver working solutions.

Production-ready in weeks. Talk directly to the senior architects who will do the work.

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