~/about

The engineer your project actually gets.

// Yawo Alphonse Siatitse — founder, Mawussi Solutions

When you hire an agency, you pitch to a partner and get a junior. When you hire Mawussi Solutions, you get me — the engineer who builds identity frameworks, multi-tenant security services, and cloud platforms at Microsoft, personally scoping, writing, and shipping your code.

For 6+ years across Microsoft Threat Protection, Unified Security Intelligence, and Cloud + AI Security, I've shipped OAuth and RBAC frameworks, event-driven pipelines handling millions of submissions a day, and analyst tooling that made whole teams faster. Independently, I design and deploy complete products end to end: React and TypeScript, .NET and Go APIs, PostgreSQL, Auth0, real-time messaging, observability, CI/CD, and Azure or Cloudflare infrastructure.

Before Microsoft, I shipped full-stack features at Morgan Stanley and co-authored FPGA research published at ACM FPGA '20. I hold a 2026 graduate certificate in Cybersecurity from Johns Hopkins and a CS degree with High Distinction — and I work fluently in English, French, and Ewe.

open for new engagements · booking August 2026
Yawo Alphonse Siatitse
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How I work

principles
01

Security by default

Threat modeling and least-privilege thinking from the first commit — so you never pay to rebuild after a security review.

02

Ship measurable wins

Every engagement is scoped around outcomes your business feels: latency, cost, reliability, revenue. Numbers, not vibes.

03

Direct & senior

You talk to the person doing the work — clear weekly communication, honest trade-offs, and no hand-offs, ever.

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Background

cv
Oct 2024 — Present
Microsoft
Threat Protection · Seattle

Software Engineer II

  • Built the platform's standard OAuth 2.0 On-Behalf-Of framework, reducing authentication overhead by 90%.
  • Led a cloud-native migration for Defender for Office spam-rule authoring, resolving an 11-month authentication bottleneck.
  • Directed a cross-tenant migration into a compliance-hardened Zero Trust Azure environment.
May 2023 — Oct 2024
Microsoft
Unified Security Intelligence · Vancouver

Software Engineer II

  • Launched isolated browser tooling for malware investigation and eliminated recurring multi-region outages.
  • Re-platformed a threat-sample service handling 4M+ submissions/day with distributed tracing and staged releases.
Jun 2020 — May 2023
Microsoft
Cloud + AI Security · Redmond

Software Engineer I

  • Built diagnostic and clustering tools that increased analyst throughput 20×.
  • Architected RBAC, fault-isolated ingestion, artifact replication, and secure secret-management systems.
Jun — Aug 2018
Morgan Stanley
New York

Summer Technology Analyst

  • Shipped two full-stack data-visualization features, saving administrators about 120 hours/year.
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Education & languages

// May 2026

Graduate Certificate, Cybersecurity

Johns Hopkins University

// 2016 — 2020

B.S. Computer Science, High Distinction

University of Rochester · Dean's List · National Society of Collegiate Scholars

lang: English (native)
lang: French (native)
lang: Ewe (native)
lang: Spanish (basic)

Let's build something secure.

Tell me about your project — you'll get a reply within two business days.