Field notes from the SSH Yazılım team on SAP, enterprise application development, integration and digitalization.
A modernization roadmap for enterprise applications stuck on Java 8: LTS strategy, module system obstacles, virtual thread gains, dependency compatibility and a staged migration plan.
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Deciding between microservices and a modular monolith: the distributed systems tax, team-scale criteria, module boundaries with Spring Modulith, decomposition signals and the strangler fig strategy.
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Campaign day architecture: the waiting room, stock reservation design, the hot product problem, absorbing traffic spikes and the campaign runbook — the whole series in one scenario.
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Consistency in distributed systems: orchestration and choreography forms of the saga pattern, compensation design, the UX of eventual consistency and reconciliation discipline.
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High-traffic API design: cursor-based pagination, idempotency keys, versioning strategy, contract-first development, HTTP cache headers and bulk endpoints.
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Pragmatic Domain-Driven Design: bounded context boundaries, the lock and scale impact of aggregate design, ubiquitous language and their counterparts in high-traffic systems.
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Resilience under high traffic: circuit breaker states, bulkhead isolation, timeout budgets, protection from retry storms and the anatomy of cascading failure.
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Overload design: token bucket and sliding window algorithms, distributed rate limiting, prioritized load shedding, graceful degradation and fair quota strategies.
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Asynchronous architecture under high traffic: queue vs event log, backpressure design, the reality of "exactly-once" and idempotent consumers, ordering, DLQs and poison message handling.
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