• 13+ years shipping production software across frontend, backend, and platform architecture
• 1M+ users on the Norwegian National Archive's public Arkivportalen portal I own at Cefalo — plus 10,000+ archivists on the internal systems
• 100,000+ users on the Swiss Life Select EU fintech platform I previously led
• 5 repositories modernized — four from Angular 14 to 21, one to the latest React — with a team reduced from 10 to 5 engineers

At senior staff level, I focus on architecture that survives scale, delivery pressure, and team changes. I write production code, drive technical direction, and mentor engineers with shipping velocity as the outcome. Every role in my career has run on Agile/Scrum — sprints, retros, and regular releases.

How I build: I run an agentic development workflow end-to-end — an agent pipeline picks up a Jira ticket, analyzes the requirement, generates a design spec and plan, implements it, then runs code review and security review, while I direct the architecture and own every merge. Every pipeline stage runs as a separate custom skill I built.

Aug 2022 – Present

Client: Norwegian National Archive (Asta), Norway

Problem

• Frontend platform spread across 5 repositories with increasing feature demand
• Team rebalanced from 10 to 5 engineers before the migration began

Approach

• Drove Angular 14→21 and React migrations across all 5 repositories — pilot repo first, then the rest in overlap
• Own the frontend of all 5 modules, plus the Arkivportalen portal and requisition backends — leading the team day-to-day, with oversight of backend work on the remaining modules
• Built dynamic permission engine and Elasticsearch-backed search capabilities
• Built a Kafka CDC pipeline keeping Elasticsearch and cross-module shared data in sync with PostgreSQL/MongoDB
• Built a digital archive middleware in Python — gradually pulls portal data into its own PostgreSQL and reconciles it against an external digital-media system (where content is published from many sources) to track each item's publish status; a separate portal-side scheduler pulls that status into portal Elasticsearch, so the portal never calls the media system directly — with retries, failure handling, and last-success checkpoints on both sides
• Implemented WebSocket live notifications; drove UI improvements and Google Analytics integration on the portal
• Set up self-hosted Bitbucket Pipelines runners on Azure VMs for CI
• Standardized testing and CI patterns across frontend codebases

Outcome

• Production system serving 10,000+ archivists and a public portal with 1M+ users
• Migration roadmap delivered with a 50% leaner team
• Consistent cross-repo engineering standards for frontend delivery

Core Stack: Angular, React, TypeScript, Kotlin, Java 21, Spring Boot, Python, PostgreSQL, MongoDB, Elasticsearch, Kafka, ActiveMQ

2018 – Jul 2022 (4 years)

Client: Swiss Life Select Fintech Platform, EU

Scale

• Frontend platform serving 100,000+ users across the EU
• Multi-tenant, microservice-backed architecture

Ownership

• Owned core frontend architecture decisions and led frontend engineers
• Built the company-wide Angular frontend architecture (SSR-capable) used by all SELISE teams — teams published shared components, and common packages (auth, SSO, SignalR-integrated notifications, dynamic datatable, dialog) shipped on an internal npm registry
• Delivered SSO, multi-tenancy, PWA, and push notifications
• Implemented real-time integrations with SignalR and RabbitMQ
• Migrated 4 projects from Angular 2 to 12
• Built data-intensive dashboard experiences using Chart.js and AG Grid

Core Stack: Angular, TypeScript, .NET Core, C#, MongoDB, Redis, RabbitMQ, SignalR, JWT, PWA

• Senior Software Engineer — Swiss Life ePrivateWealth (2017): Internal/external insurance portal with AngularJS + .NET Core microservice stack and SignalR real-time integrations.
• Software Engineer — Ruf Informatik E-Service (2016): Reservation platform, social-feed aggregation, and public statistics dashboards.
• Developer — Computer Source Bangladesh (2013 – 2015): End-to-end ERP covering inventory, RMA, sales, POS, accounts, and PMS.

Angular, React, TypeScript, JavaScript, RxJS, Redux, Angular Material, PrimeNG, Chakra UI, Bootstrap, PWA, SSR

NestJS, Node.js, Express, Kotlin, Java, Spring Boot, .NET Core, C#, Python, Django, REST, GraphQL, JWT, SSO

PostgreSQL, MongoDB, MSSQL, Redis, Elasticsearch, RabbitMQ, Apache Kafka, ActiveMQ, SignalR, WebSocket

Docker, Bitbucket Pipelines, Microsoft Azure, AWS, Azure DevOps, Jenkins, GitHub Actions, Application Insights, Azure Blob Storage

Playwright, Jest, Jasmine, Karma, TDD, DDD, SOLID, Design Patterns, Clean Architecture, Agile/Scrum, Agentic development (Claude Code)

Deep dives into the architecture decisions behind my production work — the problem, the options I weighed, and what happened:

• Migrating 5 codebases to Angular 21 with half the team — sequencing, risk, and CI standardization when the team went from 10 to 5.
• An agentic workflow: from Jira ticket to reviewed PR — an agent pipeline for spec, plan, implementation, and review, with a human owning every merge.
• CDC with Kafka: keeping Elasticsearch in sync — why change data capture beat dual writes and batch reindexing.
• A pull-only middleware: publish status behind a rate-limited API — per-item checkpointing keeps 1M-user search in sync without the portal calling the external system.
• A multi-tenant fintech platform for 100K EU users — SSO, tenancy isolation, PWA, and real-time delivery.

My repositories here are mostly focused exercises and experiments — the production work lives in client systems and is described above. All repositories →

"Working closely with Hasan the last three years has been more than a pleasure. He is smart, passionate, talented and articulate. He brought leadership and vision to building Front-End micro-services even with limited guidance."

Md. Towhidul Islam — Software Architect, Head of Technology (Direct Manager)

"I have seen him transform from a developer to a leader of a team of developers within a very short time. He manages his own tasks while ensuring the team stays on track with release plans."

Shabab Akhter — People and Product Manager, Data and AI CoE (Same Team)

"Hasan is a highly skilled problem solver and a very good team player. He takes ownership of his work and has strong leadership skill."

Md Shahi Dullah — Tech Lead, Solution Architect (Cross-team)

More recommendations: https://www.linkedin.com/in/ahasan09/details/recommendations/

If you are hiring for senior/staff engineering roles or want to collaborate on architecture-heavy frontend/platform work, I would be glad to connect.

• LinkedIn: https://www.linkedin.com/in/ahasan09/
• GitHub: https://github.com/ahasan09
• Email: mailto:abul.hasan@cefalo.com

Portfolio: https://ahasan09.github.io/