Sekou Dayifourou KEITA
Full-Stack Software Engineer
Software Engineering
Sekou Dayifourou KEITA
TypeScript Full-Stack Engineer for high-performance product systems.
I design and ship reliable full-stack architectures, with recent work spanning Cloudflare vinext contributions and the multi-tenant foundation of SUGUBA.
Selected Contributions
Proven contributions on production-grade codebases
Cloudflare (vinext)
Standardized Route Handler behaviors for Next.js compatibility. Optimized HTTP OPTIONS and Allow header logic for edge runtimes.
View contribution proof
npmx.dev
Led a full accessibility (A11y) refactor. Implemented WAI-ARIA patterns, roving tabindex, and complex keyboard navigation for the registry browser.
View contribution proof
iii-hq (motia-js)
Engineered robust state and stream guard helpers. Implemented unit testing for event-driven trigger filtering.
View contribution proofDaily contribution signal
Real contribution history, styled to match the product visual language.
Selected product work
A concise selection of products with clear architecture choices and practical outcomes.
Featured project
SUGUBA Marketplace
Lead Full-Stack Engineer
Multi-tenant marketplace currently in active development with Next.js, NestJS, PostgreSQL, Redis, and Docker.
Impact
Scaled product listing workloads with tenant-safe data design and caching.
View case study
Challenge: Support high write/read traffic across tenant-isolated product catalogs without latency spikes.
Architecture: Introduced modular service boundaries, indexed query paths, and Redis-backed hot-path caching for listing and search requests.
Result: Improved catalog responsiveness under concurrent load and reduced query pressure on core tables.
Project 02
Video_downloader
Backend/Platform Engineer
Download service built around yt-dlp, stream processing, and resilient fallback flows.
Stack
Impact
Improved reliability and consistency across multiple media quality paths.
View case study
Challenge: Handle unstable upstream media responses while keeping UX simple and resilient.
Architecture: Used yt-dlp orchestration with controlled stream handling and defensive fallback flows for unsupported formats.
Result: Raised successful completion rates and reduced user-facing failures in edge cases.
Project 03
Smart School
Application Architect
Operational platform with analytics dashboards, authentication, and workflow orchestration.
Stack
Impact
Reduced manual overhead through centralized visibility and RBAC workflows.
View case study
Challenge: Unify fragmented operations and enforce secure access for different user roles.
Architecture: Implemented RBAC-aware modules, dashboard aggregation pipelines, and clear workflow boundaries per actor.
Result: Lowered operational friction and improved decision-making through centralized analytics visibility.
Engineering systems that scale
End-to-end ownership from architecture choices to production delivery.
Expertise 1
Systems Architecture
Architecture
Event-driven microservices, resilient API contracts, and database optimization for scale.
- NestJS microservices
- REST/GraphQL APIs
- Indexing and caching strategy
Typical outcome
Reliable foundations for high-throughput, multi-service products.
Expertise 2
Product Engineering
Product
Building 0-to-1 products with Next.js and TypeScript, focused on performance and SEO outcomes.
- Next.js App Router
- Core Web Vitals (Lighthouse 95+)
- Type-safe architecture
Typical outcome
Faster iteration cycles with measurable web performance improvements.
Expertise 3
Cloud and DevOps
Cloud
Production pipelines, serverless execution, and infrastructure reliability.
- Docker and Linux VPS
- GitHub Actions CI/CD
- AWS Lambda and SST
Typical outcome
Stable delivery flow from code to production with fewer release risks.
Stack optimized for product startups
Practical tools used in production, not a keyword list.
Capability snapshot
Balanced front-end and back-end execution with infrastructure fluency, focused on shipping maintainable products and measurable outcomes.
Domains
4
Tools
19
Domain 1
Languages
Type safety, runtime clarity, and maintainable code paths.
Toolset
Domain 2
Frontend
Fast interfaces with strong UX foundations and accessibility.
Toolset
Domain 3
Backend
Reliable APIs, explicit contracts, and scalable service design.
Toolset
Domain 4
Infra
Resilient deployment and production-first operations.
Toolset
Let's build something serious
Open to full-time engineering roles and high-impact product challenges.
Collaboration
I partner with teams that value robust architecture, clean delivery, and long-term product quality.
Availability
Open to full-time roles and selective freelance missions.
