Case Study

Secure Financial Integration Layer

A platform connecting regulated institution’s core systems with external partners and market networks.

Client overview

The client is a regulated financial institution responsible for banking, custody, and market operations across multiple asset classes. Operating in a highly governed environment, the institution requires strict security, compliance, and auditability across every integration point. Its technology strategy prioritises reliability, scalability, and adherence to industry standards for partner connectivity and data exchange.

Project details

Integration Complexity

The institution’s core systems operated in silos, with no unified layer to manage partner access or process inbound market data. Each new partner required bespoke integration work, slowing onboarding and increasing operational risk in a tightly regulated environment.

A Scalable Connection Point

The goal was to deliver a robust integration platform with two core streams: a B2B partner access layer and a market connectivity service using an industry-standard trading protocol over TCP — built to evolve over a multi-year engagement.

delivery span

0 yrs

core streams

backend stacks

infra as code

0 %

Unified integration layer for partners

Market connectivity via trading protocol

Regulatory-grade security and access

A managed, long-term team model

Full observability and CI/CD pipelines

How we did it

Discovery & Architecture Design

We mapped the institution’s integration landscape and defined a microservices architecture using Hexagonal, CQRS, and Domain-Driven Design (DDD) patterns – ensuring clear separation of concerns and long-term maintainability.

Partner Platform Development

We built the B2B partner stream: onboarding, credential management, entitlement control, and partner-facing APIs. Mutual TLS (mTLS) and OpenID Connect (OIDC) secured every access point.

Market Connectivity Engineering

We developed the market stream handling an industry-standard trading protocol over TCP — including session management, message parsing, validation, routing, and response enrichment within a secure transport layer.

Infrastructure & DevOps

We provisioned all environments with Terraform, containerised workloads with Docker, and set up GitLab CI/CD pipelines. Centralised monitoring, alerting, and distributed tracing ensured operational stability.

Ongoing Operation & Evolution

Over three years we operated, maintained, and evolved the platform — handling change requests, onboarding new partners, and extending capabilities through a managed delivery model.

Tech stack & team composition

Delivery Lead

Backend Engineers (Node.js & Java)

Cloud/Platform Engineer

QA Engineer

Results

Unified integration layer

Core and partner systems connected through one secure platform.

Faster partner onboarding

Standardised APIs and access controls cut time to connect partners.

Market connectivity live

Trading protocol running reliably over TCP in production.

Full infra as code

All environments provisioned and managed via Terraform and CI/CD.

Three-year managed delivery

Continuous operation, maintenance, and evolution under one team.

The team delivered exactly what our regulated environment demanded.

Senior Technology Stakeholder

The collaboration ran for three years, covering build and operate duties. Espeo’s engineers became a trusted extension of the team.

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