Founding Engineer.
I build, deploy, operate,
and grow real software products.
Five self-built products, designed, shipped, and operated in production, each used by real people who depend on it.
About
I build software because it is how I solve real operational problems through technology. I have designed, built, deployed, and operated multiple production software products, from the first line of code to the customer using it.
I don't only write code. I also:
- Design products
- Design system architecture
- Deploy infrastructure
- Handle DevOps
- Talk to customers
- Do customer support
- Market products
- Prioritize features
- Iterate from user feedback
I enjoy taking a product from a rough idea to something live in production. My long-term goal is to found a world-class technology company.
Featured products
DavinaRadius
2024Multi-tenant ISP billing and network management SaaS for African ISPs.
Multi-tenant SaaS, live in production
ProductBackendInfrastructureDeploymentCustomer SupportMarketingDocumentation
DjangoPostgreSQLRedisCeleryCelery BeatDocker ComposeTraefikFreeRADIUSMikroTik RouterOS APIWireGuardS3 backupsStalwart MailCloudflareREST API
Tenthliner
2025LegalTech platform for Kenyan court e-filing compliance.
Scaled to handle large PDFs with 2,000+ pages
ProductBackendInfrastructureCustomer Support
DjangoPyMuPDFCeleryRedisSeaweedFSClamAVDockerPaystack
57Places
2025Travel marketplace connecting travelers with African tour agencies.
Cold start solved via claimable agency profiles
ProductBackendInfrastructureInternal Tooling
CloudflareApplication-level cachingScheduled jobsInternal AI tooling
Clariss
2024Creative colour platform for designers, from extraction to palettes.
Around 4,000 monthly active users
ProductBackendFrontendCustomer Support
Client-side JavaScriptk-means clusteringServer-side caching
Take5
2026Browser-based word guessing game, play alone or challenge a friend.
ProductBackendFrontend
DjangoBootstrapJavaScriptREST API
Technical writing
Published technical articles for Vultr. I also write on LinkedIn about engineering, building products, customer service, and founding companies.
Custom User Authentication with Simple JWT in Django RESTful
EducativeA course on implementing JWT authentication in Django REST Framework: custom user creation, email verification, token management, and password resets.
Timeline
Timeline coming soon.
Architecture & technologies
Backend & Data
DjangoREST APIPostgreSQLRedisPyMuPDFSeaweedFSClamAVk-means clustering
Infrastructure & DevOps
DockerDocker ComposeCeleryCelery BeatTraefikS3 backupsCloudflare
Networking & Identity
FreeRADIUSMikroTik RouterOS APIWireGuard
Payments & Messaging
PaystackStalwart Mail
Frontend & Client
BootstrapJavaScriptClient-side JavaScript
Other
Application-level cachingScheduled jobsInternal AI toolingServer-side caching
Contact
Open to select freelance and collaboration work.
Email: sajeyksmwangi@gmail.com