// codename: S4F4Y4T
Safayat MahmudSenior Software Engineer
Senior Software Engineer with 5+ years of experience. I started in cybersecurity, moved into backend development, and found my sweet spot in DevOps and system architecture. I build SaaS products for HRMS, healthcare, and enterprise clients using Golang and Laravel — experienced in microservices, multi-tenant systems, cloud infrastructure, and automated CI/CD pipelines.
About
My journey into tech started with cybersecurity, where I was fascinated by breaking and securing systems. As I dived deeper, my curiosity grew about what happens behind the scenes — how applications are built and operate. That curiosity led me to software development. Deepening my skills, I discovered DevOps: the perfect combination of development, automation, and operations. Now, I focus on streamlining workflows, optimizing infrastructure, and ensuring seamless deployments. My passion lies in building reliable, efficient, and scalable systems that empower businesses to innovate faster.
const engineer = {
focus: "backend, devops & system architecture",
origin: "cybersecurity → backend → infra",
builds: ["HRMS", "healthcare", "enterprise SaaS"],
loves: "multi-tenant systems & clean CI/CD",
};
// education
Tech Arsenal
Languages
Backend & Architecture
Databases & Caching
Messaging & Streaming
DevOps & Infrastructure
Observability
Experience
Senior Software Engineer
01/2024 — Present- ▸Developed SaaS applications using Golang, Laravel, gRPC, RabbitMQ and Next.js built on a microservices architecture.
- ▸Led zero-downtime migration from AWS to DC2 for AutoMarket and Nagad Islamic, maintaining full uptime throughout transition.
- ▸Mentored junior engineers while contributing to recruitment and onboarding processes.
- ▸Owned CI/CD pipelines and Docker-based containerization strategy for all production services.
Web Application Developer
05/2021 — 12/2023- ▸Developed SaaS applications using Laravel, CodeIgniter and React.js, including a booking system and CRM (RocketWave).
- ▸Integrated payment gateways (Stripe, PayPal, Square) for subscription and transaction-based workflows.
- ▸Managed VPS infrastructure and handled application deployment and production maintenance.
Featured Builds
- ›SaaS platform for diagnostic labs to manage test data, patient records and laboratory workflow.
- ›Built core modules for test management, billing and dynamic report template generation.
- ›Integrated AI chat using multiple LLM providers for automation and user interaction.
- ›SaaS office management system with automated billing/subscription and biometric attendance integration.
- ›Integrated AI-assisted tax calculation into payroll to automate computations and reduce manual errors.
- ›Multi-tenant architecture supporting isolated workspaces per client with role-based access control.
Farm Management Software
- ›Cattle management system covering full lifecycle tracking: reporting, dairy, slaughter, purchase and sales.
- ›Developed an integrated eCommerce module for meat selling and transactions within the platform.
Smart Scheduling Platform
- ›Scheduling SaaS platform similar to Calendly for managing meetings and availability.
- ›Calendar booking with time-slot management, automated scheduling and Google Calendar sync.
// currently building
SaaS Payment Portal
Centralized Payment & Subscription Hub
- ›Unified portal for end clients to manage payments, plans, and invoices across multiple SaaS products from a single dashboard.
- ›Handles multi-product billing, subscription lifecycle, and tenant-scoped access — eliminating per-app payment fragmentation.
// open source
05. // contact
Let's build something resilient.
Open to senior engineering, architecture and DevOps roles. Got a system to scale or a SaaS to ship? My inbox is open.