Backends that keep your business talking.
I'm Mosaab Abbas. For 8+ years I've built distributed systems, event-driven platforms and the integrations between them, at Tieto, Klarna and Simployer. Norrstack is how you hire me directly.
Enterprise scale, fintech pace, HR-tech detail.
Took legacy Java platforms to modern LTS releases and from Tomcat WARs to containers. Built integrations on Camel, RabbitMQ and Azure Service Bus, and cut CI/CD time from 12 to 6 minutes.
Backend services for automated risk assessment and credit decisions, on Java, Spring Boot, GraphQL, Kafka and AWS. Cut PostgreSQL and DynamoDB query times by 35%.
Integrations between HR, payroll and finance systems. Many vendors, many data models, one source of truth.
Four things I do well. Pick one to see the stack behind it.
Three ways to work together.
You talk to the engineer who does the work. No account managers, no hand-offs to a junior team.
Audit
I read the code, the queues and the dashboards. You get a ranked list of risks and the cheapest fix for each.
- Written report
- Walkthrough with your team
Embedded engineer
I join your team, take tickets, review pull requests and raise the bar on the integration and backend side.
- Your tools, your rituals
- Knowledge stays with the team
Build & hand over
A new integration or service, built with tests, runbooks and monitoring, then handed to your team.
- Agreed scope and milestones
- Documented hand-over
One engineer. Opinions backed by evidence.
I like the parts of a system nobody sees until they break: the queue, the retry policy, the mapping between two systems that disagree about what an employee is. I make those parts boring, measurable and well documented.
Tell me what's breaking.
A 30-minute intro call is free. I reply within one working day.