Your product, shipped secure.
Built right the first time.
I build identity and security platforms at Microsoft — and I'll bring the same engineering to your product. One senior engineer who designs, builds, and deploys the whole thing: architecture, APIs, frontend, cloud, with security in from the first commit. No hand-offs. No agency overhead.
Yawo Siatitsefounder · software engineer, Microsoft Security
What I can build for you
servicesSecurity Architecture & Zero Trust
Worried your system won't survive contact with an attacker — or an auditor? I design defenses that assume breach and pass the compliance bar.
Identity & Access
Auth is where breaches start and products stall. I ship OAuth 2.0, RBAC, and IAM that stay fast and secure as you grow — no incidents, no lockouts.
Cloud & DevOps
If deploys are scary and the cloud bill keeps climbing, I set up reproducible infrastructure and CI/CD that ship safely and run cheap.
Backend & APIs
Services that hold up under real load — C#/.NET and Go, REST & GraphQL, clean contracts, and performance your users can feel.
Full-Stack & Product
Have an idea and no team? I take products from blank repo to deployed and working — frontend, backend, cloud, and auth included.
Microservices & Serverless
Event-driven architectures that handle millions of operations a day without runaway cost — built for scale you can actually afford.
How an engagement works
processFree 30-minute scope call
You describe the problem, I ask the hard questions. If I'm not the right fit, I'll tell you straight and point you somewhere better.
Fixed proposal in 48 hours
A written plan with scope, milestones, timeline, and one price. No running day-rate meter, no surprise invoices.
Weekly working demos
Working software every week in a repo you own from day one. You always know exactly where the project stands.
Handover + 30-day support
Documentation, deployment, and a clean handoff to you or your team — with 30 days of post-launch support included.
Why teams hire Mawussi
guaranteesYou talk to the engineer
No account managers, no work quietly handed to juniors. The person on the scope call is the person writing your code — a Microsoft security engineer with 6+ years shipping multi-tenant platforms.
Numbers, not vibes
90% less auth overhead · 20× analyst throughput · 4M+ submissions/day · $1–2M/mo saved. Every engagement is scoped around an outcome you can measure.
Secure by default
Threat modeling, least privilege, and audit trails are built in from the first commit — not bolted on before launch. You ship a product you won't have to rebuild after your first security review.
Selected work
case studiesCut auth overhead 90% — and unblocked an 11-month migration
Built the OAuth 2.0 framework that became the platform standard, then used it to move Defender for Office tooling to a cloud-native platform protecting millions of enterprise seats.
From blank repo to a live multi-portal admissions platform
Designed and shipped UniAccess end to end — student, university, and admin portals with applications, documents, interviews, payments, and Azure deployment. One engineer, the whole product.