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QEQuinton ElsIndependent Contractor

Independent Contractor

Quinton Els

Delivering robust, scalable payment infrastructure and software architecture for the modern fintech landscape.

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Engagement model
Independent contractor, B2B
Practice focus
Payment infrastructure
Delivery
Project-based, remote

About

A focused practice in payments software.

Quinton Els is an independent contractor engaged by enterprises to design, build, and harden the software underneath modern payment operations. The work sits at the intersection of architecture, full-stack product delivery, and the technical systems that move value between institutions, processors, and digital-asset infrastructure.

Engagements are structured as B2B professional services: scoped programmes, clear deliverables, and production-grade implementation. The practice does not operate as a licensed payment institution. It supplies the engineering and architecture that payment businesses depend on.

  • Enterprise software architecture

    System design for regulated, high-availability platforms—domain boundaries, integration topology, and the operational controls enterprises require.

  • Full-stack development

    End-to-end delivery across services, APIs, and operator-facing products, with an emphasis on maintainable code and production readiness.

  • Technical payment systems

    The software that moves value: rails, messaging, gateways, reconciliation, and the control planes that sit around institutional money movement.

Specializations

Where the work is concentrated.

A deliberately narrow set of capabilities, each tied to how institutions move, message, and reconcile value.

  1. 01

    B2B fintech solutions

    Architecture and delivery of commercial payment products for institutional buyers—onboarding, settlement, reporting, and the control planes that sit around them.

  2. 02

    ISO 20022 payment messaging

    MX message design and implementation, mapping from legacy MT formats, and integration against correspondent and clearing flows that now require ISO 20022.

  3. 03

    Digital payment gateways

    Self-hosted and commercial gateway implementations, including Payram and BTCPay Server, with emphasis on operational reliability, reconciliation, and controlled payouts.

  4. 04

    Automated API integrations

    Treasury, settlement, and reconciliation automations that connect banking APIs, processors, and crypto rails into a single operational picture.