01Email infrastructure
Workspace DNS Checker
A read-only diagnostic for Google verification, MX, SPF, DKIM, and DMARC records.
View systemAvailable for select freelance work
Shohan Biswas / Infrastructure specialist
I engineer calm into business email.
Google Workspace migrations, DNS authentication, and backend tools that keep teams connected.
Client operations / controlled changeWorkflow active
AuditPlanChangeVerify
EducationCSE / PUST 2024
Primary workGoogle Workspace
Trust layerSPF / DKIM / DMARC
EngineeringPython / Node / Next.js
Selected systems
Work built around real operational friction.
02Email infrastructure
Mail Deliverability Test
A DNS-based assessment of routing and sender-authentication readiness.
View system03Systems automation
Ubuntu Automatic Update Script
A Bash utility that automates package updates for Ubuntu-based Linux distributions.
View systemServices
From DNS audit to clean handoff.
Focused help for teams moving, securing, or repairing business email.
5.0477 reviews / Level 2Explore servicesPublic tools
Check before you change.
Run read-only Workspace and mail DNS diagnostics directly from this portfolio.
Open infrastructure toolsCapabilities
One operator, four connected layers.
01Workspace & Mail
02Backend Engineering
03Product Development
04Systems & AI
Field notes
Writing from the work.
Building Reliable Email Infrastructure for Small Teams
A practical checklist for SPF, DKIM, and DMARC checks when setting up Google Workspace.
Next.js Architecture for a Portfolio That Scales
Keep portfolio sections and blog in one app while still having clean content boundaries.