Conceptual product visual
01 / Product engineering
Velora Marketplace
Designing and developing a multi-vendor commerce platform around seller workflows, ordering, payments integration, and maintainable application architecture.
Explore productComplex systems.Clear outcomes.
I'm Samson Sibona Njaji. I design and build dependable digital products, backend services, and cloud-enabled systems — with a curiosity for what comes next in applied AI.
Nairobi, Kenya Working across borders
Inside the build / 01SYSTEMS / SOFTWARE / CLOUD
From an idea to a dependable system
Intentional interfaces. Clear services. Reliable data.
ClientInteraction
→
APIValidation
→
ServicesLogic
→
DataStorage
Design principles · not an actual infrastructure diagram● Clear contracts
// What I value in engineering
const principle = {clarity: true,reliability: true,curiosity: 'always'};
const principle = {clarity: true,reliability: true,curiosity: 'always'};
Less noise.
More signal.
More signal.
01 / Selected work
Built with purpose.
Shaped by craft.
A closer look at representative product and engineering work. No exaggerated metrics, no invented case studies.
Company engineering portfolio
02 / CO-FOUNDED COMPANY · ENGINEERING
SIONA Technologies
I co-founded SIONA and build its software and AI products—from WhatsApp-based business tools and market-analysis systems to education, community and operations platforms.
Explore SIONA productsThe Velora graphic is illustrative. Products and their status are detailed in the company portfolio below.
02 / SIONA PRODUCT ECOSYSTEM
Real platforms.
Built through my company.
I co-founded SIONA Technologies and lead the engineering behind its public software products. These are publicly documented platforms I have worked on building and shaping, not hypothetical case studies.
Explore the full company portfolioINTELLIGENT BUSINESS TOOLSLive
Weza AI
WhatsApp-native business assistance for recording sales, expenses and receipts through conversation, voice and images.
Explore Weza AIMARKET ANALYSIS SYSTEMSLive
SIONA APA Dashboard
An evidence-led analytical workspace for reviewing market structure, liquidity and validated closed-candle data. No trade execution or guaranteed returns.
Visit platformEDUCATION PLATFORMSLive
Jenga Elimu
Education operations software designed around staff, learners, guardians and institutional workflows.
Visit platformSOCIAL IMPACTLive
Kitara Foundation
A digital platform for programme discovery, giving, impact communication and confidential safeguarding journeys.
Visit platformEDUCATION & ADMISSIONSLive
Betha Academy
A school-facing platform presenting learning, admissions, facilities and practical information for families.
Visit platformPROPERTY OPERATIONSPrototype
SIONA Property
A prototype for rental, tenant, occupancy and maintenance operations with consolidated management visibility.
View prototypeHEALTHCARE OPERATIONSLive
Joyce Njaji HealthOps
A service-oriented web presence and operational support experience hosted and supported by SIONA.
Visit platformRETAIL INFRASTRUCTUREIn development
SIONA Commerce
An in-development operating layer for point of sale, inventory and omnichannel retail visibility.
View product overviewCORPORATE WEB ENGINEERINGLive
SIONA Technologies website
The public-facing technology company platform connecting services, capabilities, product studies and business enquiries.
Visit SIONA websiteVelora Marketplace is featured above. Product ownership and operating status belong to SIONA Technologies; descriptions follow the company's public portfolio. Confidential client systems and private research are intentionally omitted.
02 / Engineering approach
Built for the real world.
Not just the demo.
Useful systems are not only about the framework. They're about the decisions behind them.
01 — THINK
Understand the problem.
Clarify what people need, map the workflow, and work backward from a measurable, practical outcome.
02 — ENGINEER
Build with intention.
Design cohesive interfaces, predictable APIs, maintainable data models, and sensible security boundaries.
03 — ITERATE
Make it dependable.
Test assumptions, investigate failures, document tradeoffs, and improve based on evidence.
ENGINEERING MINDSET / CLARITY → QUALITY → RELIABILITYLess spectacle, more substance ↗
03 / Leadership & work
I build platforms.
I lead the engineering
behind them.
As co-founder, chairperson and CTO of SIONA Technologies, I lead engineering direction and contribute hands-on to our product ecosystem, including intelligent business tools, multi-tenant systems, cloud platforms and digital products. SIONA is my co-founded company—not an outside employer.
See products I've built at SIONACo-founder, Chairperson & Chief Technology Officer
SIONA TechnologiesTechnology leadership and hands-on engineering across SIONA's public product ecosystem, from Weza AI and APA to education and operations platforms.
Founder & Software Engineer
Velora MarketplaceDeveloping seller, customer and administrator workflows across a multi-vendor commerce product.
Co-lead & Technical Lead
AWS Cloud Club · Core teamTechnical mentorship and practical cloud learning initiatives; not the founder of the chapter.
BSc, Software Development
KCA University, NairobiTraining across software engineering, programming, applied AI and data-related disciplines.
04 / Applied research interests
Curiosity is useful.
Evidence is better.
Under the public-facing label Sibona AI, I discuss broad interests in learning systems, ML evaluation, and trustworthy software. Some independent work remains exploratory and unpublished. Private project names, designs, and experimental results are intentionally not disclosed here.
Applied MLSystem evaluationEfficient computingEngineering research
Public overview only. Not a product launch or claim of established scientific results.
05 / Technical capabilities
The tools are means.
The outcome matters.
Selected technologies I work with, grouped by engineering discipline rather than an endless list of badges.
01 / LANGUAGES
Engineering foundations
- TypeScript
- JavaScript
- Python
- Java
- C++
02 / APPLICATIONS
Web & backend
- React
- Next.js
- NestJS
- REST APIs
- PostgreSQL
03 / DELIVERY
Cloud & infrastructure
- AWS
- Docker
- Linux
- GitHub
- Cloudflare
04 / DATA
Applied AI & evaluation
- PyTorch basics
- Pandas
- NumPy
- Model evaluation
- Experimentation
SAMSON / ENGINEER & CO-FOUNDER
06 / Behind the engineering
Good systems begin with better questions.
I'm a Kenyan software engineer who enjoys both the discipline of building working products and the curiosity of understanding how intelligent systems might improve. My experience spans application engineering, software architecture, practical data work, and technical mentorship.
Outside product work, I value careful research, learning from other engineers, and building technology that matters to real people.
07 / Start a conversation
Let's build something
that matters.
For thoughtful technical collaborations, engineering work, research discussions or interesting opportunities.