Software architecture & engineering
The systems institutions depend on.
ęxaucæ designs, builds and runs secure, scalable software for international organisations, public institutions and companies working across Africa and beyond.
- 11countries
- Teams, clients and users across Africa, Europe and North America.
- 8cloud certifications
- Amazon Web Services, Microsoft Azure and HashiCorp.
- 3platforms in production
- Lectio, Sanjola and SantéMentaleAfro, designed and built in-house.
- 5working languages
- English, French, Spanish, Wolof and Lingala.
Track record
Trusted with production systems since 2020.
Seven organisations on three continents, where our founder designed, built and led systems in production. Listed for context, not as ęxaucæ clients.
eTipSan Francisco2025–present
GensertNauheim2023–2025
Gamma LinkDakar2023–20242020–2021
RobotistgroupGeneva2023–2024
DiwalaOslo2022–2023
ModelsisDakar2021
SenvitaleDakar2020
Capabilities
From cloud foundations to the products people use every day.
We take responsibility for the hard parts: architecture, security, delivery, and the handover that lets your own team own what we build.
Cloud architecture & migration
Landing zones, AWS and Azure architectures, infrastructure as code with Terraform, cost and resilience reviews.
Product engineering
Web, mobile and multiplatform products, from the first prototype to the version thousands of people rely on.
Digital public infrastructure
Digital identity, registries and interoperability between public systems. Secure by design, built for real-world bandwidth.
Payments & financial systems
Payment flows, ledgers and reconciliation that stand up to auditors and regulators.
Platform engineering
Continuous delivery, containers, observability and release processes that make shipping routine rather than risky.
Applied AI
Retrieval-augmented assistants grounded in your own documents, with the guardrails institutions require.
Architecture reviews & technical due diligence
An independent, written assessment of a system, a vendor or a proposal, before you commit budget.
Our products
We build products, and we run them.
Operating our own software in production means we live with the consequences of every architectural decision we recommend.
ęxaucæ product
Lectio
Scripture, lectionary, sermons and hymns for churches, with reading plans and personal notes. One product across the App Store, Google Play and the web.
ęxaucæ product
Sanjola
Choir management for parishes from Dakar to Kinshasa: songs, singers, rehearsals and attendance, on every singer’s phone. In French, English, Wolof and Lingala.
Built for a medical practice
SantéMentaleAfro
A bilingual mental-health platform for a physician’s practice, with online booking, analytics and a design system built to evolve with its owner.
Selected engagements
Engineering in production, on three continents.
Each engagement is listed with its context: where the engineering was delivered, when, and with what.
2025–present
Payments
Payment systems for North America
Securing and shipping payment systems for the tipping industry, integrated with card-network processors.
- Context
- Engineering delivered at eTip · San Francisco, USA
- Stack
- Kotlin · Spring Boot · AWS · PostgreSQL · Stripe · TabaPay
2023–2025
Conversational AI
A secure AI assistant, and the platform beneath it
Infrastructure, architecture and core services for a growing company, then a cross-platform AI chat with retrieval-augmented generation on top: a Kotlin Multiplatform customer portal on JVM, web and Android, a WebAssembly chat client, a migration to Azure Container Apps, and a delivery pipeline rebuilt to deploy 20% faster.
- Context
- Engineering delivered at Gensert Technologies · Nauheim, Germany
- Stack
- Kotlin Multiplatform · Compose · Wasm · Spring Boot · Azure · Terraform · MongoDB
2023–20242020–2021
Logistics
Carrier tracking across West Africa
Carrier onboarding, shipment tracking and automatic mission assignment for road freight in Senegal and the region: services in hexagonal architecture, a Kafka bridge from GPS tracking, micro-frontends and a mobile app, with a five-person engineering team under our lead.
- Context
- Engineering led at Gamma Link · Dakar, Senegal
- Stack
- Spring Boot · Kafka · Traccar · Kubernetes · Argo CD · AWS · Next.js · React Native
How we work
Clear scope. Senior people. No lock-in.
1–2 weeks
Discovery & architecture
Fixed scope, fixed price. You leave with a target architecture, a costed roadmap and the risks named up front.
2+ months
Delivery
We design, build and ship in short iterations, with your team involved and production in sight from the first week.
One-off or retainer
Advisory & review
Architecture reviews, technical due diligence, cloud cost and security assessments. Independent, and in writing.
From the first call to the handover
- 1
Listen
Stakeholders, constraints, users, regulation. We write it down and read it back to you.
- 2
Design
Architecture, security model and plan, reviewed with you before code is written.
- 3
Build
Iterative delivery, automated tests and pipelines, and demonstrations you can hold us to.
- 4
Hand over
Documentation, runbooks and training. You own the code, the cloud and the keys.
Principles
Low bandwidth, many languages, mixed devices. Africa first, not as an afterthought.
Built to be handed over
Everything we deliver is documented, reproducible and yours.
Conservative where it matters
Proven technology at the core. Novelty only where it earns its place.
Secure by default
Least privilege, infrastructure as code and audit trails from the first commit.
Designed for real conditions
Systems that work on the networks and devices people actually have.
Working with institutions
Ready for institutional procurement.
We work the way public bodies and international organisations need to buy: formally, in writing, and in your language.
- Registration
- Company registered in Senegal, with tax identification (NINEA)
- Proposals
- Formal technical and financial proposals, in English or French
- Confidentiality
- Non-disclosure and data-protection agreements
- Vendor status
- Vendor registration and framework agreements
- Invoicing
- In USD, EUR or XOF
Tell us about the system you need to build.
A short call is usually enough to know whether we are the right firm. If we are not, we will say so, and point you to someone who is.
Excellence is how we thank you for your trust. Care is how we keep it.
Chrys NgomaFounder & principal architect