A transactional notification service with NestJS and Brevo
How to structure a dedicated NestJS notification service, sync versioned HTML templates to the Brevo API, and decouple delivery through RabbitMQ.
- Engineering
- Integrations
- Architecture
Keyson frames, builds and operates web platforms, SaaS products and infrastructure layers, with a constant focus on architecture, delivery and code clarity.
To better understand our approach, explore our About page , read our engineering journal or contact us .
In production
Architecture, delivery and SaaS publishing.
10+
years of engineering practice
04
core capability areas
02
SaaS products published
Keyson stands for sober engineering. We make defensible choices, ship readable code, and keep operations in view well beyond the first release.
We frame structures before writing code: flows, data, integrations, build vs buy. Good architecture makes everything else fast.
Audits, team reinforcement, fixed-scope or build & run — we match the intervention to your context and maturity.
As a SaaS publisher, we think about support, operations and time-to-value from the first commit.
We work the full chain: consulting, architecture, development, operations. Every engagement keeps clarity on deliverables, governance and quality.
Assessments, technical trajectory, web architecture, API and internal platforms.
Full-stack delivery, SaaS, back-offices, business applications and internal tools.
Automation, reliability, observability, CI/CD, environment and cost mastery.
Generative AI integration, workflow automation, pragmatic usage and cost control.
Commerce architecture, customer journeys and operational flows between content and product.
A senior contributor who can absorb technical and product stakes quickly.
The right format depends on clarity, delivery pace and the level of autonomy you need.
Short mission to clarify a topic, align stakeholders and reduce uncertainty.
Autonomous senior contributor embedded in your team with clear technical ownership.
Defined perimeter with deliverables, governance and quality commitment.
Continuous responsibility on a digital asset: build, stabilize, evolve.
Cercly is the association management SaaS platform published by Keyson. It centralises members, memberships, events and cash flow to reduce the administrative burden on associations.
Workshops.social is the free workshops platform published by Keyson. It connects professionals who share a skill with people who want to learn, around short, free sessions.
Keyson's founder previously worked on consulting and software delivery assignments for organizations such as Edenred, Groupama, Vallourec and SFR.
More than a decade of consulting and delivery on critical systems.
We publish our technical choices, field reports and framing methods to nourish the conversation.
How to structure a dedicated NestJS notification service, sync versioned HTML templates to the Brevo API, and decouple delivery through RabbitMQ.
How we built Cercly's AWS infrastructure with Terraform — VPC, EC2, RDS, ECR, Route53, ACM, OIDC — so the entire production environment can be recreated with a single apply.
A reading of Cercly's SaaS architecture focused on application boundaries: shared design system, separate frontends, dedicated BFFs, business APIs and shared infrastructure.
First contact within two business days. No sales intermediary — straight to the technical team.