Clear Role Fit
I specialize in backend systems where uptime, correctness, and security matter across multiple domains.
Backend Engineer | Payments, Logistics, Platform Systems
Secure backend engineering for products that cannot fail silently.
I design and ship backend systems for payment workflows, fulfillment operations, and transaction integrity, and operational reliability. My work combines architecture discipline, security-first implementation, and production observability.
Node.js
NestJS
TypeScript
AWS
RabbitMQ
MongoDB
Redis
Grafana
About Me
Backend engineer focused on reliable, secure systems
I am Akintunde Israel Segun, a backend engineer with experience building production services across payments, logistics, and platform operations. I enjoy solving complex architecture problems, improving service reliability, and collaborating with teams to deliver systems that are clean, testable, and safe at scale.
Why Hire Me
Core Value Proposition
Proof of Execution
I have delivered APIs, microservices, auth flows, and live-system monitoring in production environments.
Ownership Mindset
I own architecture decisions through deployment, maintenance, observability, and iterative improvement.
Experience Highlights
Backend impact across products and domains
Maxim (Credit Card Platform) | Senior Backend Engineer
- Built a rule-driven revenue distribution system with configurable commission structures.
- Engineered a multi-channel communication microservice with scheduling and retry mechanisms.
- Designed metrics pipelines for business and technical performance visibility.
Procurify International Trading Ltd (Logistics and Payment Platform) | Senior Backend Engineer
- Architected NestJS APIs for auth, KYC, payment verification, shipping, and real-time notifications.
- Implemented security hardening with JWT auth, validation, CORS, rate limiting, and secure headers.
- Established observability using Prometheus, Loki, and Grafana for live production diagnostics.
Deamsoft (Business Platform and API Integrations) | Node.js/NestJS Developer
- Delivered secure backend services with role-based authorization and robust server-side validation.
- Integrated payment workflows and CI/CD automation for reliable release delivery.
Security & System Design
How I design resilient production backends
Defense in Depth
Authentication, authorization, validation, rate limiting, and hardened API boundaries.
Failure-Aware Design
Retry strategies, idempotent operations, and asynchronous messaging for resilient workflows.
Observability by Default
Metrics, logs, and dashboards wired for early risk detection and faster incident response.
Service Boundary Clarity
Modular APIs and microservices with explicit contracts for scalable team collaboration.
Security Projects + Case Studies
Implementation evidence from real repositories
RequestValidator
View repositoryExpress middleware project focused on API boundary safety through structured request validation.
Problem
Malformed request bodies create security gaps and unpredictable backend behavior.
Approach
Route-level schema checks for required fields, type validation, and min/max constraints.
Security Value
Invalid payloads are rejected early before business logic execution.
Tech
JavaScript, Express middleware, body parsing, deterministic error responses.
event-delivery-system
View repositoryEvent delivery backend foundation for webhook workflows designed around reliability and recoverable failures.
Problem
External webhook consumers can miss critical events when services fail or timeout.
Approach
Structured trigger endpoint with delivery flow designed for retries and event tracking extensions.
System Design
Decouples event intake from delivery lifecycle for scalable integration architecture.
Tech
JavaScript, Express, JSON middleware, REST endpoint design for event-driven systems.
Technical Stack
Tools used in delivery
Backend & APIs
Node.js, NestJS, TypeScript, Express, REST APIs, Fastify, Microservices
Security Controls
JWT, OAuth integrations, API keys, validation, rate limiting, CORS, Helmet
Data & Messaging
MongoDB, Redis, RabbitMQ, Firestore, PostgreSQL
Infra & Monitoring
AWS, DigitalOcean, Docker, Prometheus, Loki, Grafana
Contact
Open to Backend Engineer opportunities
Available immediately for teams building secure, high-volume backend systems in payments, logistics, and operations.
Akintunde Israel Segun | Backend Engineer | Immediate Availability