Available for full-time, freelance and long-term missions

Faster, more reliable, easier-to-sell SaaS platforms.

I design fast, secure, production-ready SaaS platforms for teams that want to ship without technical debt.

Discuss a project See case studies

Multi-tenantRBACPaymentsBack-office

YDL Product AuditSaaS readiness

Pre-build

MVP readiness4 pillars

Auth, billing, ops and data scoped to launch a marketable SaaS.

Auth & rolesRBAC, sessions, invitations

Ready

BillingPlans, payments, quotas

To scope

OpsLogs, alerts, traceable errors

To strengthen

DataDashboards, exports, events

Ready

Client interfaceModular APIPostgreSQL + jobs

10K+

concurrent users

Modular backend architecture, Redis cache and critical APIs.

-65%

load time reduction

Frontend optimization, queries and product journeys.

25K+

NPM downloads

Open source tools used by developers.

published packages

Node.js, n8n, automation and backend frameworks.

Metrics based on internal project data and client estimates.

About

A fullstack profile focused on product, not just execution.

I design web and SaaS platforms with equal attention to architecture, delivery speed, user experience and business constraints. The goal: turn a fragile idea or process into a clear, maintainable, market-ready product.

Hire me Download CV

Mission snapshotTurn a fuzzy need into a shippable product.

01Diagnosis

02Architecture

03Build

04Stabilization

I start by scoping business flows, permissions, data and delivery risks. Then I build a clear product base: maintainable API, readable interface, useful automations and a deployment ready to be handed over.

Deliverables

Documented API · RBAC · payments · admin dashboard · monitoring · deployment

Positioning

Technical enough to secure the architecture, product-minded enough to keep usage at the center.

Expertise

Expertise built as product levers.

Every intervention targets a concrete outcome: ship faster, clarify architecture, secure flows and reduce operational overhead.

Produit

SaaS architecture

Structure a clear platform before it becomes hard to maintain.

Node.js/TypeScript backends, RBAC, payments, queues, dashboards and maintainable APIs.

Business domain splitAPI contractsCritical journeys

Interface

Web & mobile product

Build fast, readable interfaces designed for real usage.

React, Next.js and React Native interfaces with clear hierarchy, performance and product polish.

Next.jsReact NativeDesign systems

Ops

Business automation

Reduce repetitive tasks without creating fragile dependencies.

n8n/Make workflows, data enrichment, batches and internal tools to reduce manual operations.

n8nBatchesData enrichment

Quality

Performance & security

Stabilize response times and protect sensitive flows.

API optimization, cache, permissions, input validation, monitoring and hardening of critical journeys.

RedisRBACMonitoring

Selected projects

Concrete evidence, not just a stack.

Each project highlights the context, the expected outcome and the technical value actually delivered.

Mobile

RunWeek

Connected sports tracking that unifies Garmin, Apple Watch, Samsung and Xiaomi into a single experience.

A single app for all wearable ecosystems on the market, with consolidated training load calculation.

View case study

Fullstack

Prospect-Pro AI

AI-enhanced B2B prospecting: multi-channel sourcing, lead scoring and message personalization.

A 60% increase in conversion rate was observed, and sales teams gained approximately 15 hours per week.

View case study

Fullstack

Nexus Platform

Multi-channel financial investment platform — web, mobile, admin, and technical blog.

Platform deployed in production, mobile app in Google Play review, E2E encrypted transactions with automatic reconciliation.

View case study

Journey

A career built around product, performance and automation.

Each experience reinforces the same foundation: turning a business constraint into a clear, maintainable platform ready to evolve.

ProductBackendAutomationSEO

View all journeys

April 2024 – July 2024

Lomé, Togo

Fullstack Developer & Project Manager

Groupe Drapeau

Design and development of the web platform for Groupe Drapeau, a civil engineering, construction equipment rental, and real estate company in Togo. I took charge of the entire project: architecture, fullstack development, server configuration, performance optimization, and security best practices on the production side. The role also included product coordination with management. The source code is public on my GitHub. The mission concluded with a complete transfer to Groupe Drapeau's internal team for corrective and evolutionary maintenance.

Prepare the complete transfer to the internal team from the outsetNext.jsNode.jsJavaScript

View details

Juillet 2024 — Mars 2025

Lomé, Togo

Fullstack Development Trainer

IAFP La Pyramide

Training mission at IAFP La Pyramide, a stateaccredited modular training institute in Togo. My role: teach programming fundamentals and walk learners through to delivering autonomous fullstack applications. The program covered algorithmic principles, JavaScript, TypeScript, Dart, modern web development with Next.js, and mobile with Flutter and React Native. I emphasized clean code, version control and collaborative development. Learners shipped endtoend practical projects with regular code reviews and projectbased evaluation. Result: an 85% certification rate across the cohort.

Adapter le rythme à des profils d'apprenants très hétérogènesFaire passer la culture du code propre et du contrôle de versionMaintenir un taux de complétion élevé sur des programmes longsJavaScript

View details

Février 2025 — Octobre 2025

Remote

Software Engineer & Automation Expert

Ubuntu Consulting SARL

Building B2B SaaS solutions and automation platforms for agency clients. The mission covered five products shipped to production, intelligent scraping systems and generative AI integrations. I built ProspectPro (AIaugmented B2B prospecting platform), RunWeek (connected sports tracking across multiple brands), HomeEnergy (energy calculations SaaS), MailCraft (newsletter creation with PDF generation) and an automated data enrichment platform. In parallel, I designed advanced automation pipelines: intelligent scraping (Pages Jaunes, Pappers, GoAfrica, Google Maps), N8N + MailWizz automated campaigns, and an automated phone call system via Vapi + SIP. The period also produced three published NPM packages around N8N.

Industrialiser plusieurs produits SaaS en parallèle sans dérive de qualitéConstruire des nœuds N8N réutilisables et publiables sur le registry publicGérer le scraping légal à grande échelle sans pénaliser les sourcesNext.js

View details

Stack

A technical ecosystem calibrated to produce, scale and maintain.

Tools are not a logo collection. They form a coherent production chain: interface, API, data, deployment and automation.

ProductScalabilityMaintenance

Testimonials

Collaboration built for clarity and execution.

Honest feedback from clients and partners who saw the work move from scoping to delivery.

Samson K. Tofa G.Founder — Nexus Corporation · Nexus Corporation

“David structured a financial web and mobile platform with a strong product vision: backend architecture, security, payments, real-time dashboarding, and operational reliability. He is autonomous, rigorous, and capable of turning complex requirements into a usable system.”

May 23, 2026

M. IgorFounder — Ubuntu Consulting SARL · Ubuntu System SARL

“David quickly understands the business challenges behind technical tools. On our SaaS, B2B prospecting, and automation projects, he built useful, maintainable, and result-oriented solutions.”

May 23, 2026

IAFP La PyramideManagement — IAFP La Pyramide · IAFP La Pyramide

“David does not simply teach code; he teaches learners how to think like developers. His pedagogy, rigor, and project-based approach brought real value to the program.”

May 23, 2026

Blog

Technical notes for building better.

All articles

Tech · 7 min read

DX 2026 — picking your Node.js + TypeScript stack without falling into traps

Node 22 LTS, pnpm, Vite, Vitest, ESLint flat, Zod, Turborepo: the stack I default to in 2026 and why boring beats revolutionary.

Yao David Logan · May 23, 2026Read article

Tech · 9 min read

Observability for a fintech platform — logs, metrics, traces and audit

Structured JSON logs, propagated trace ID, OpenTelemetry, P1/P2/P3 alerts with runbooks, append-only audit log: the toolkit to diagnose a fintech incident in 5 minutes.

Yao David Logan · May 23, 2026Read article

Business · 8 min read

From MVP to traction — 8 patterns to avoid shipping a sleeping B2B SaaS

Sell before coding, time-to-value under 5 min, pricing before features, product observability, native multi-tenant: what separates SaaS that take off from those that sleep.

Yao David Logan · May 23, 2026Read article

Contact

Let's discuss your next product step.

Choose a direct channel or prepare a structured brief. The brief is sent directly to my inbox.

Faster, more reliable, easier-to-sell SaaS platforms.

concurrent users

load time reduction

NPM downloads

published packages

A fullstack profile focused on product, not just execution.

Expertise built as product levers.

SaaS architecture

Structure a clear platform before it becomes hard to maintain.

Web & mobile product

Build fast, readable interfaces designed for real usage.

Business automation

Reduce repetitive tasks without creating fragile dependencies.

Performance & security

Stabilize response times and protect sensitive flows.

Concrete evidence, not just a stack.

RunWeek

Connected sports tracking that unifies Garmin, Apple Watch, Samsung and Xiaomi into a single experience.

Prospect-Pro AI

AI-enhanced B2B prospecting: multi-channel sourcing, lead scoring and message personalization.

Nexus Platform

Multi-channel financial investment platform — web, mobile, admin, and technical blog.

A career built around product, performance and automation.

Fullstack Developer & Project Manager

Fullstack Development Trainer

Software Engineer & Automation Expert

A technical ecosystem calibrated to produce, scale and maintain.

Collaboration built for clarity and execution.

Technical notes for building better.

DX 2026 — picking your Node.js + TypeScript stack without falling into traps

Observability for a fintech platform — logs, metrics, traces and audit

From MVP to traction — 8 patterns to avoid shipping a sleeping B2B SaaS

Get the next technical notes.

Let's discuss your next product step.