Payment Systems
End-to-end payment flows, settlement, reconciliation, and provider orchestration built for production load.
Technologies
JavaSpring BootPostgreSQLRedis
Architecture
- Idempotency
- Exactly-once semantics
- Ledger patterns
Independent Fintech Engineer · Freelance & Contract · Remote WorldwideAvailable for new projects
Building Scalable PaymentInfrastructure & EnterpriseBackend Systems
Backend & Fintech Engineer specialized in APIs, distributed systems, mobile money integrations, and cloud-native architectures.
Payment SystemsDistributed SystemsAPI ArchitectureMobile Money
Dakar, Senegal (GMT) — open to international freelance & contract engagements. · Start a project
Trusted by teams building in demanding industries
BankingFintechCredit SystemsHealthcareEnterprise SaaS
Companies
Partner brands: BOA Group, ENG Technologie, Mafalia, SarayaTech Senegal.
Trusted expertise
Enterprise-grade capabilities trusted by startups and companies building financial products at scale.
Backend Engineering
Domain-driven services, clean boundaries, and APIs designed for long-lived fintech platforms.
Technologies
Spring BootREST APIsApache KafkaDocker
Architecture
- Clean Architecture
- DDD
- Hexagonal ports
API Architecture
Versioned, observable APIs with strict contracts — gateways, webhooks, and partner integrations.
Technologies
OpenAPISpring Cloud GatewayJWTHMAC
Architecture
- API gateways
- Rate limiting
- Schema evolution
Distributed Systems
Event-driven microservices that stay consistent when networks fail and traffic spikes.
Technologies
Apache KafkaDockerKubernetesAWS
Architecture
- Event sourcing
- CQRS
- Saga orchestration
Cloud & DevOps
Cloud-native delivery with CI/CD, observability, and infrastructure that scales with your product.
Technologies
AWSDockerKubernetesGitLab CI/CD
Architecture
- 12-factor apps
- SLOs
- Zero-downtime deploys
Mobile Money Integrations
Unified integrations for Orange Money, Wave, and regional wallets — one API for your product team.
Technologies
WaveOrange MoneySpring SecurityPostgreSQL
Architecture
- Provider abstraction
- Retry policies
- Audit trails
Featured projects
Case studies built for enterprise credibility.
Investor-ready narratives — problem, architecture, security, scale, and measurable outcomes.
Services
Clear, high-impact engagements for teams that need senior backend and fintech delivery — not generic dev shop output.
Fintech System Development
Greenfield or legacy modernization — payment rails, credit engines, and core financial workflows delivered with production rigor.
Payment Gateway Integration
Connect banks, wallets, and PSPs with secure webhooks, reconciliation, and operational dashboards.
Backend API Development
REST and event-driven APIs with OpenAPI contracts, auth, observability, and performance tuned for real traffic.
Cloud Infrastructure
AWS/Kubernetes foundations, CI/CD pipelines, and environments your team can operate confidently.
Architecture Consulting
Discovery, ADRs, and reference architectures — de-risk major technical decisions before you commit budget.
Mobile Money Integration
Orange Money, Wave, and multi-provider SDK patterns — faster go-live with fewer production surprises.
Tech stack
Production technologies behind banking, fintech, and distributed backends — aligned with real delivery, not a keyword list.
Backend
Java 17Spring BootSpring SecuritySpring CloudNestJS
Frontend
AngularTypeScriptReactNext.jsTailwind CSSStorybook
Data & Cache
PostgreSQLMySQLRedisMongoDBSQLKafka Streams
Messaging & APIs
Apache KafkaRabbitMQREST APIsGraphQLOpenAPIgRPCWebhooks
Cloud & Delivery
DockerKubernetesAWSGoogle CloudGitLab CI/CDGitHub Actions
Fintech & Practices
WaveOrange MoneyJasper ReportsISO 20022PCI-DSSDDDClean ArchitectureEvent-driven designCQRSProvider abstraction
Credentials
Validated expertise you can trust
Engineering principles
How every engagement is engineered — the non-negotiables behind systems that handle money at scale.
Scalability
Horizontal scaling, async boundaries, and data models that grow without rewrites every funding round.
Reliability
Idempotency, retries, and failure modes designed in — because financial systems must survive real networks.
Security
Zero-trust patterns, signed webhooks, least-privilege access, and audit trails on every state change.
Maintainability
Clear module boundaries, documented APIs, and code your team can extend after handoff.
Performance
Latency budgets, caching where it matters, and profiling tied to user-visible outcomes.
Clean Architecture
Domain at the center — infrastructure as detail, not the other way around.
Work process
A proven delivery workflow for freelance and contract engagements — transparent, predictable, enterprise-ready.
- 01
Discovery
Goals, constraints, stakeholders, and success metrics — aligned before architecture or estimates.
- 02
Architecture
System design, data contracts, security model, and phased roadmap with explicit trade-offs.
- 03
Development
Incremental delivery with reviews, CI/CD, and demos tied to business milestones.
- 04
Testing
Unit, integration, and regression coverage — plus failure injection where money moves.
- 05
Deployment
Production rollout, runbooks, monitoring, and handoff your team can operate.
- 06
Optimization
Post-launch tuning — latency, cost, and reliability improvements from real traffic data.
Client trust
Feedback from teams who needed senior fintech delivery — on deadline, under regulatory pressure.
“Delivered our credit and mobile-money flows with the rigor of a regulated environment. Integration time dropped sharply and we had zero critical incidents post-launch.”
“Strong architecture instincts — defined APIs and event boundaries before code, which saved us months of rework when partner integrations scaled.”
“Communicates clearly with product and compliance stakeholders. Exactly what we needed for a senior freelance backend engagement.”
Engineering insights
Notes on building payment systems, scaling backend architectures, and lessons from financial infrastructure in Africa.
About
Senior fintech engineer, freelance-first
Independent specialist in payment infrastructure and enterprise backends — delivering remotely for startups and regulated teams worldwide.
Based in Dakar, Senegal (GMT). Available for international freelance and contract engagements. Long-term interest: building financial infrastructure products from the ground up.
4+
Years in production
20+
Systems delivered
GMT
Dakar · Remote
Freelance Backend & Fintech Engineer
Payment infrastructure · International contracts
Contact
Let's Build Reliable Systems That Scale
International freelance & contract engagements — describe your system, constraints, and timeline. You'll get a direct, honest answer.