Senior technology consultancy

Software that works where it matters.

Marquis helps businesses design, build and improve the systems behind their operations: robust APIs, dependable backend platforms, high-volume data flows, databases, integrations and the tooling needed to run them well.

API
API-first systemsClean integrations and services
DB
Relational databasesDesign, indexing and tuning
↗
High-volume workloadsBuilt with scale in mind
.NET
Production platformsPractical .NET engineering
What Marquis does

Practical engineering for important systems.

Support can be focused around a specific problem or continue as an ongoing technical partnership. The objective is the same: understand the business requirement, make sound technical decisions and leave the system better than we found it.

01 · Build

Backend & API development

Design and implementation of dependable platform services, integrations and operational systems.

  • REST APIs and integration layers
  • Background services and workers
  • Internal tools and operational dashboards
  • Secure multi-user and multi-tenant platforms
02 · Review

Architecture & technical review

Independent senior review of systems, codebases and technical direction — without unnecessary reinvention.

  • Architecture and maintainability review
  • Risk, bottleneck and failure-point analysis
  • Scaling and reliability planning
  • Clear, prioritised recommendations
03 · Optimise

Database & performance engineering

Improve the part of the system where a small technical change can make a very large operational difference.

  • Relational data modelling
  • Query and index optimisation
  • Reporting structures and data flows
  • Throughput and contention analysis
04 · Guide

Fractional CTO & senior technical support

Experienced technical input for businesses that need leadership without adding a permanent executive role.

  • Technical strategy and planning
  • Vendor and architecture decisions
  • Engineering standards and review
  • Translation between business and technology
Experience without the theatre

Some of the best technology is meant to stay behind the scenes.

Marquis does not rely on a public catalogue of client systems or product names to demonstrate capability. Much of the work is operational, commercially sensitive or simply more valuable to the client than it is as a case study. Experience is reflected in the engineering itself: resilient architecture, clean APIs, sound data design, useful operational tooling and systems that keep doing their job.

Relevant examples of past work and client references can be provided on request, subject to confidentiality.

Areas of hands-on production experience

01
Transactional platformsSystems where throughput, correctness, auditability and uptime matter.
02
Multi-tenant SaaS architectureSecure account structures, workflows, permissions, billing and operational controls.
03
Payments & integrationsExternal services, verification, messaging, billing and platform-to-platform APIs.
04
Operational visibilityMonitoring, reporting, dashboards and tools that make complex systems understandable.
Engineering priorities

Built around the things that become expensive when they go wrong.

Good backend engineering is rarely about novelty. It is about making sensible trade-offs, protecting critical data, understanding failure modes and ensuring the system remains operable as the business grows.

Reliability

Systems designed with failure, recovery and operational continuity in mind.

Performance

Architecture and data access that remain efficient as traffic and data volumes increase.

Maintainability

Code and structures that the next engineer can understand without archaeology.

Security

Practical protection of accounts, data, services and integration boundaries.

Visibility

Enough monitoring and reporting to know what the system is actually doing.

Clarity

Technical decisions explained in business terms, including trade-offs and risks.

How engagements work

A calm, structured route from problem to improvement.

The process is intentionally straightforward. Start by understanding what matters, diagnose before prescribing, implement what is useful and make sure the improvement lasts.

Understand

Clarify the business goal, current architecture, constraints and pressure points.

Diagnose

Identify the issues that genuinely matter: design gaps, bottlenecks, risk or missing visibility.

Implement

Build, refactor or guide the work using engineering suited to the real operating environment.

Stabilise

Document, monitor and support the system so the technical improvement carries forward.

Mark Turner, Founder & Lead Software Engineer at Marquis Information Services
Founder-led consultancy

Senior engineering, directly involved.

Marquis Information Services is led by Mark Turner, Founder & Lead Software Engineer. The model is intentionally hands-on: technical decisions, architecture and engineering work remain close to the person accountable for the result.

That makes Marquis a good fit for founders, business owners and teams that need experienced technical input without the overhead of a large consultancy.

Backend architecture C# / .NET MariaDB / SQL API platforms Technical leadership
Start with the problem

Need a senior technical partner for your platform?

Send a short note about the system, challenge or idea you want to discuss. Marquis is based in South Africa and available to work with clients globally.