I build scalable, event-driven enterprise platforms with Java, Spring Boot, C#/.NET, and cloud technologies. They are designed to remain dependable under real operating load.https://rahiyansafin.vercel.appRunning a travel review platform at scale — review eligibility, fraud detection, ranking that resists gaming, and the moderation workflow that makes it trustworthy.https://rahiyansafin.vercel.app/writing/travel-review-platform/https://rahiyansafin.vercel.app/writing/travel-review-platform/Tue, 14 Jul 2026 00:00:00 GMTWhy a global SQL database is really a problem of agreement and time, how Google solved it with TrueTime, GPS, and atomic clocks, and how CockroachDB reaches a practical design on ordinary infrastructure.https://rahiyansafin.vercel.app/writing/cockroachdb-architecture-spanner-hlc/https://rahiyansafin.vercel.app/writing/cockroachdb-architecture-spanner-hlc/Tue, 16 Jun 2026 00:00:00 GMTA story-led explanation of Tasks, compiler-generated state machines, continuations, threads, I/O completion, exceptions, cancellation, contexts, and practical async design in .NET.https://rahiyansafin.vercel.app/writing/how-async-await-work-in-csharp/https://rahiyansafin.vercel.app/writing/how-async-await-work-in-csharp/Tue, 28 Apr 2026 00:00:00 GMTA plain-English walkthrough of how an ASP.NET Core application starts, builds its middleware pipeline, accepts traffic through Kestrel, selects an endpoint, and returns a response.https://rahiyansafin.vercel.app/writing/how-aspnet-core-runtime-handles-a-request/https://rahiyansafin.vercel.app/writing/how-aspnet-core-runtime-handles-a-request/Tue, 24 Mar 2026 00:00:00 GMTAn end-to-end migration article covering compatibility, partition mapping, dual running, cutover, rollback, and the operational model after Kafka.https://rahiyansafin.vercel.app/writing/kafka-to-azure-event-hubs/https://rahiyansafin.vercel.app/writing/kafka-to-azure-event-hubs/Tue, 17 Feb 2026 00:00:00 GMTA story-led, end-to-end guide to CockroachDB changefeeds, Kafka records, and a practical C# consumer, including offsets, ordering, duplicates, recovery, and production design.https://rahiyansafin.vercel.app/writing/cockroachdb-cdc-kafka-csharp/https://rahiyansafin.vercel.app/writing/cockroachdb-cdc-kafka-csharp/Tue, 20 Jan 2026 00:00:00 GMTAsynchronous replication separates primary commit, standby receipt, durable flush, and replay. Read-your-writes depends on replay; failover loss depends on what reached the promoted standby.https://rahiyansafin.vercel.app/writing/replica-lag-read-your-writes/https://rahiyansafin.vercel.app/writing/replica-lag-read-your-writes/Fri, 26 Dec 2025 00:00:00 GMTOFFSET makes the executor process and discard rows before the page, so deep pages grow linearly even with an index. Keyset pagination bounds that work, and a unique tiebreaker makes the cursor unambiguous.https://rahiyansafin.vercel.app/writing/offset-pagination-cost/https://rahiyansafin.vercel.app/writing/offset-pagination-cost/Sat, 20 Dec 2025 00:00:00 GMTHow to remove database round trips without confusing batching, transactions, preparation, concurrency, and bulk-loading behavior in Npgsql and PostgreSQL.https://rahiyansafin.vercel.app/writing/batching-round-trips/https://rahiyansafin.vercel.app/writing/batching-round-trips/Sat, 13 Dec 2025 00:00:00 GMTThe N+1 is not a slow query, it is a correct query repeated thousands of times, and because it works in development with ten rows the only reliable defence is a query count assertion in the test suite.https://rahiyansafin.vercel.app/writing/ef-core-n-plus-one/https://rahiyansafin.vercel.app/writing/ef-core-n-plus-one/Sun, 07 Dec 2025 00:00:00 GMTA soft-deleted row still holds its unique value, so the second registration of the same email fails on a constraint nobody expected to fire. The fix is a partial index, and the decision about whether to use one is upstream of that.https://rahiyansafin.vercel.app/writing/soft-deletes-unique-constraints/https://rahiyansafin.vercel.app/writing/soft-deletes-unique-constraints/Sun, 30 Nov 2025 00:00:00 GMTA JSONB column lets you add an attribute without a migration, which is a real win. The mistake is treating that freedom as a licence to put everything in it, and the mature answer is a hybrid.https://rahiyansafin.vercel.app/writing/jsonb-deferred-schema/https://rahiyansafin.vercel.app/writing/jsonb-deferred-schema/Mon, 24 Nov 2025 00:00:00 GMTHow many database connections you actually need is arithmetic, not intuition, and the real risk is that your pod count multiplies a per-instance default into more connections than Postgres has.https://rahiyansafin.vercel.app/writing/connection-pool-sizing/https://rahiyansafin.vercel.app/writing/connection-pool-sizing/Mon, 17 Nov 2025 00:00:00 GMTHow PostgreSQL foreign keys use child-side access paths and parent-row locks, how to audit composite indexes, and how validation differs from enforcement.https://rahiyansafin.vercel.app/writing/foreign-keys-missing-index/https://rahiyansafin.vercel.app/writing/foreign-keys-missing-index/Tue, 11 Nov 2025 00:00:00 GMTWhy a five millisecond metadata change stalled a site for forty minutes, how a queued ACCESS EXCLUSIVE lock blocks every query behind it, and why lock_timeout is the setting that makes a migration safe.https://rahiyansafin.vercel.app/writing/add-column-lock-queue/https://rahiyansafin.vercel.app/writing/add-column-lock-queue/Tue, 04 Nov 2025 00:00:00 GMTA deadlock needs a cycle in the wait-for graph, which is why consistent lock ordering removes an entire class of incident, and why the database picking a victim is the good outcome.https://rahiyansafin.vercel.app/writing/deadlocks-lock-ordering/https://rahiyansafin.vercel.app/writing/deadlocks-lock-ordering/Wed, 29 Oct 2025 00:00:00 GMTWhy the ANSI isolation table describes symptoms rather than mechanisms, what MVCC changed, and how snapshot isolation still lets two correct transactions corrupt each other.https://rahiyansafin.vercel.app/writing/isolation-levels-and-write-skew/https://rahiyansafin.vercel.app/writing/isolation-levels-and-write-skew/Wed, 22 Oct 2025 00:00:00 GMTHow PostgreSQL separates writes, WAL flushes, synchronous commit, hardware truthfulness, and group commit—and where each durability promise can fail.https://rahiyansafin.vercel.app/writing/fsync-durability-group-commit/https://rahiyansafin.vercel.app/writing/fsync-durability-group-commit/Thu, 16 Oct 2025 00:00:00 GMTWhy an LSM engine saturates a disk with no user traffic, how write stalls turn a background merge into a latency incident, and why the disk needs headroom a capacity graph will never show.https://rahiyansafin.vercel.app/writing/lsm-compaction-write-stalls/https://rahiyansafin.vercel.app/writing/lsm-compaction-write-stalls/Thu, 09 Oct 2025 00:00:00 GMTThe RUM conjecture frames an access method as a trade among read overhead, update overhead, and memory or storage overhead—not as a theorem about range scans.https://rahiyansafin.vercel.app/writing/rum-conjecture-storage-tradeoffs/https://rahiyansafin.vercel.app/writing/rum-conjecture-storage-tradeoffs/Fri, 03 Oct 2025 00:00:00 GMTWhy a matching index still costs one random read per row, how INCLUDE columns turn that into an index-only scan, and why a stale visibility map quietly puts the heap read back.https://rahiyansafin.vercel.app/writing/covering-indexes-index-only-scans/https://rahiyansafin.vercel.app/writing/covering-indexes-index-only-scans/Fri, 26 Sep 2025 00:00:00 GMTSargability, stale statistics, the leftmost prefix rule, correlated columns, and the cost settings that make a planner reject an index it should have chosen.https://rahiyansafin.vercel.app/writing/unused-index-planner-rejection/https://rahiyansafin.vercel.app/writing/unused-index-planner-rejection/Sat, 20 Sep 2025 00:00:00 GMTRandom UUIDs spread B-tree inserts across leaf pages; time-ordered UUIDs improve locality. The effect differs sharply between InnoDB's clustered table and PostgreSQL's heap.https://rahiyansafin.vercel.app/writing/uuid-primary-key-fragmentation/https://rahiyansafin.vercel.app/writing/uuid-primary-key-fragmentation/Sat, 13 Sep 2025 00:00:00 GMTA key-to-node map, frequency buckets, and a minFreq pointer that advances on promotion and resets on insertion, plus concurrency and aging limits of exact LFU.https://rahiyansafin.vercel.app/writing/lfu-cache-o1/https://rahiyansafin.vercel.app/writing/lfu-cache-o1/Sun, 07 Sep 2025 00:00:00 GMTRevenue management for travel — demand forecasting, price fences, the difference between dynamic and surge, and why published prices must be honoured.https://rahiyansafin.vercel.app/writing/dynamic-pricing-travel/https://rahiyansafin.vercel.app/writing/dynamic-pricing-travel/Sun, 31 Aug 2025 00:00:00 GMTAircraft seat maps as a constraint problem — legality, preference, family adjacency, and the concurrent reservation race that a seat map is uniquely bad at.https://rahiyansafin.vercel.app/writing/seat-selection-reservation/https://rahiyansafin.vercel.app/writing/seat-selection-reservation/Mon, 25 Aug 2025 00:00:00 GMTPrice alert infrastructure — polling strategies, trigger thresholds, alert fatigue, and the honesty problem when the price moves after you alert.https://rahiyansafin.vercel.app/writing/price-alert-system/https://rahiyansafin.vercel.app/writing/price-alert-system/Mon, 18 Aug 2025 00:00:00 GMTShort-term rental platforms at scale — the 365-night calendar, host reliability, dynamic pricing integration, and local regulation as a first-class constraint.https://rahiyansafin.vercel.app/writing/vacation-rental-marketplace/https://rahiyansafin.vercel.app/writing/vacation-rental-marketplace/Tue, 12 Aug 2025 00:00:00 GMTRunning a two-sided accommodation marketplace — supply onboarding, ranking that serves both sides, payments in a regulated flow, and the disputes problem.https://rahiyansafin.vercel.app/writing/accommodation-marketplace/https://rahiyansafin.vercel.app/writing/accommodation-marketplace/Tue, 05 Aug 2025 00:00:00 GMTUsing DRY to keep business knowledge authoritative across rules, contracts, data, operations, and documentation without forcing unrelated code into one abstraction.https://rahiyansafin.vercel.app/writing/practical-dry-beyond-code-reuse/https://rahiyansafin.vercel.app/writing/practical-dry-beyond-code-reuse/Wed, 30 Jul 2025 00:00:00 GMTHotel booking as an overbooking-and-allocation problem — room types, allotments, cancellation policy state, and the race between hold, book, and confirm.https://rahiyansafin.vercel.app/writing/hotel-booking-system/https://rahiyansafin.vercel.app/writing/hotel-booking-system/Wed, 23 Jul 2025 00:00:00 GMTFlight search at scale — GDS and aggregator fan-out, result caches that age gracefully, and the itinerary-combinatorics problem that makes searching hard.https://rahiyansafin.vercel.app/writing/flight-search-system/https://rahiyansafin.vercel.app/writing/flight-search-system/Thu, 17 Jul 2025 00:00:00 GMTBuilding navigation at map scale — road-graph routing, map matching from GPS traces, live traffic estimation, and incremental rerouting.https://rahiyansafin.vercel.app/writing/waze-navigation/https://rahiyansafin.vercel.app/writing/waze-navigation/Thu, 10 Jul 2025 00:00:00 GMTPackage tracking as a scan-event pipeline — status models, exception handling, the ETA problem, and why carrier webhooks are the hard part.https://rahiyansafin.vercel.app/writing/logistics-package-tracking/https://rahiyansafin.vercel.app/writing/logistics-package-tracking/Fri, 04 Jul 2025 00:00:00 GMTLast-mile delivery route design, density-based territory planning, failed delivery recovery, and the operational details that dominate the economics.https://rahiyansafin.vercel.app/writing/last-mile-delivery-system/https://rahiyansafin.vercel.app/writing/last-mile-delivery-system/Fri, 27 Jun 2025 00:00:00 GMTFreight dispatch with capacity, hours-of-service, and multi-depot realities — the parts of dispatch that a load board does not solve.https://rahiyansafin.vercel.app/writing/driver-dispatch-system/https://rahiyansafin.vercel.app/writing/driver-dispatch-system/Sat, 21 Jun 2025 00:00:00 GMTMulti-day itineraries as constraint satisfaction, with travel time, opening hours, reservations, and the user's own trade-offs made explicit.https://rahiyansafin.vercel.app/writing/travel-itinerary-planner/https://rahiyansafin.vercel.app/writing/travel-itinerary-planner/Sat, 14 Jun 2025 00:00:00 GMTHow ride matching actually works — spatial partitioning, ETA matrices, batch windows, and why lowest-detour and shortest-wait pull in opposite directions.https://rahiyansafin.vercel.app/writing/ride-matching-algorithm/https://rahiyansafin.vercel.app/writing/ride-matching-algorithm/Sun, 08 Jun 2025 00:00:00 GMTCandidate generation, two-stage ranking, exploration, and the feedback loops that turn a travel recommender into a filter bubble.https://rahiyansafin.vercel.app/writing/travel-recommendation-engine/https://rahiyansafin.vercel.app/writing/travel-recommendation-engine/Sun, 01 Jun 2025 00:00:00 GMTVehicle routing with capacity and time windows, large neighbourhood search, and why an optimal solution computed offline is worthless by morning.https://rahiyansafin.vercel.app/writing/route-optimization-engine/https://rahiyansafin.vercel.app/writing/route-optimization-engine/Mon, 26 May 2025 00:00:00 GMTOCPP, the five-system transaction, demand charges on connected capacity, idle bays, and why public charging reliability is a hardware problem wearing a software costume.https://rahiyansafin.vercel.app/writing/ev-charging-network/https://rahiyansafin.vercel.app/writing/ev-charging-network/Mon, 19 May 2025 00:00:00 GMTThe unlock and ride lifecycle, when a ride actually starts, curb economics, battery swap logistics, and why the payment authorisation is the hardest part of a scooter.https://rahiyansafin.vercel.app/writing/bike-scooter-sharing-platform/https://rahiyansafin.vercel.app/writing/bike-scooter-sharing-platform/Tue, 13 May 2025 00:00:00 GMTEvent time versus processing time, checkpointing and exactly-once state, backpressure, and choosing heap or disk-backed state with an explicit recovery budget.https://rahiyansafin.vercel.app/writing/stream-processing-kafka-flink/https://rahiyansafin.vercel.app/writing/stream-processing-kafka-flink/Tue, 06 May 2025 00:00:00 GMTHours-of-service compliance, driver behaviour scoring as an employment decision, fuel leakage, and why a fleet system's real value sits in the five percent of cases that are not normal.https://rahiyansafin.vercel.app/writing/fleet-management-system/https://rahiyansafin.vercel.app/writing/fleet-management-system/Wed, 30 Apr 2025 00:00:00 GMTDesigning a cursor-based long-poll endpoint in ASP.NET Core with bounded waits, replay, replica coordination, overload control, and failure testing.https://rahiyansafin.vercel.app/writing/long-polling-in-dotnet/https://rahiyansafin.vercel.app/writing/long-polling-in-dotnet/Wed, 23 Apr 2025 00:00:00 GMTScheduling, shuffle, data skew, dynamic allocation, and the operational patterns that decide whether a 4-hour batch job is a cost centre or an outage risk.https://rahiyansafin.vercel.app/writing/batch-processing-system/https://rahiyansafin.vercel.app/writing/batch-processing-system/Thu, 17 Apr 2025 00:00:00 GMTLocal-first hubs, Matter and Thread, the state machine behind automations, and why a smart home that stops working during an outage is a remote control with extra features.https://rahiyansafin.vercel.app/writing/smart-home-platform/https://rahiyansafin.vercel.app/writing/smart-home-platform/Thu, 10 Apr 2025 00:00:00 GMTDesigning a .NET upload boundary that is honest about buffering, quotas, untrusted metadata, scanning, durable storage, retries, and OpenAPI.https://rahiyansafin.vercel.app/writing/file-uploads-minimal-apis/https://rahiyansafin.vercel.app/writing/file-uploads-minimal-apis/Fri, 04 Apr 2025 00:00:00 GMTIncremental extraction, idempotent loads, late-arriving data, backfills, and the data quality checks that decide whether anyone trusts the warehouse.https://rahiyansafin.vercel.app/writing/etl-pipeline/https://rahiyansafin.vercel.app/writing/etl-pipeline/Fri, 28 Mar 2025 00:00:00 GMTThe fifteen year fleet problem, what a CAN bus will actually let you log, command safety on an intermittently connected car, and why a connected vehicle has four data subjects and not one.https://rahiyansafin.vercel.app/writing/connected-vehicle-platform/https://rahiyansafin.vercel.app/writing/connected-vehicle-platform/Sat, 22 Mar 2025 00:00:00 GMTTiered storage for device telemetry, the wide-versus-narrow table decision that changes everything, and why rolling data up is cheaper than querying it raw.https://rahiyansafin.vercel.app/writing/iot-analytics-platform/https://rahiyansafin.vercel.app/writing/iot-analytics-platform/Sat, 15 Mar 2025 00:00:00 GMTA boundary-first way to decide whether shared API behavior belongs in a base controller, middleware, filters, authorization, or explicit application services.https://rahiyansafin.vercel.app/writing/base-controller-shared-concerns/https://rahiyansafin.vercel.app/writing/base-controller-shared-concerns/Sun, 09 Mar 2025 00:00:00 GMTWhy the hard problem in city data is departmental ownership rather than throughput, and what to do about coordinate systems, spatial joins, privacy, and data quality you can defend.https://rahiyansafin.vercel.app/writing/smart-city-platform/https://rahiyansafin.vercel.app/writing/smart-city-platform/Sun, 02 Mar 2025 00:00:00 GMTDomain ownership, data as a product, the federated plane, and why data mesh is a reorganisation with an API in front of it.https://rahiyansafin.vercel.app/writing/data-mesh-architecture/https://rahiyansafin.vercel.app/writing/data-mesh-architecture/Mon, 24 Feb 2025 00:00:00 GMTThe IT and OT boundary, the edge, OPC-UA versus Modbus, historians, digital twins, and why a control loop must never depend on a network it does not own.https://rahiyansafin.vercel.app/writing/industrial-iot-platform/https://rahiyansafin.vercel.app/writing/industrial-iot-platform/Mon, 17 Feb 2025 00:00:00 GMTChoosing and operating bounded parallelism in .NET across CPU work, asynchronous I/O, channels, dependency limits, cancellation, and production measurement.https://rahiyansafin.vercel.app/writing/parallel-programming-in-dotnet/https://rahiyansafin.vercel.app/writing/parallel-programming-in-dotnet/Tue, 11 Feb 2025 00:00:00 GMTDesired state versus reported state, bulk configuration, staged firmware rollouts, and why a two million device fleet is a control plane problem before it is a console problem.https://rahiyansafin.vercel.app/writing/iot-device-management-system/https://rahiyansafin.vercel.app/writing/iot-device-management-system/Tue, 04 Feb 2025 00:00:00 GMTChoosing and operating password hashing in .NET with ASP.NET Core Identity, Argon2id or PBKDF2, versioned envelopes, peppers, upgrades, and capacity controls.https://rahiyansafin.vercel.app/writing/secure-password-hashing-in-dotnet/https://rahiyansafin.vercel.app/writing/secure-password-hashing-in-dotnet/Wed, 29 Jan 2025 00:00:00 GMTSchema registries, compatibility modes, ownership as data, and why a metadata system without enforced write paths becomes a documentation site.https://rahiyansafin.vercel.app/writing/metadata-management-system/https://rahiyansafin.vercel.app/writing/metadata-management-system/Wed, 22 Jan 2025 00:00:00 GMTModeling instants, local dates, wall-clock schedules, offsets, and time-zone identifiers explicitly across .NET, EF Core, databases, and APIs.https://rahiyansafin.vercel.app/writing/time-zones-with-ef-core/https://rahiyansafin.vercel.app/writing/time-zones-with-ef-core/Thu, 16 Jan 2025 00:00:00 GMTConnection counts, QoS, session state, provisioning, and the MQTT to Kafka bridge, written for fleets large enough that the hard problem is connections rather than throughput.https://rahiyansafin.vercel.app/writing/iot-data-ingestion-platform/https://rahiyansafin.vercel.app/writing/iot-data-ingestion-platform/Thu, 09 Jan 2025 00:00:00 GMTHow a high-frequency sensor stream is partitioned, windowed, and turned into an alarm, including the state-size problem that decides whether a stream processor survives contact with real data.https://rahiyansafin.vercel.app/writing/sensor-data-processing-pipeline/https://rahiyansafin.vercel.app/writing/sensor-data-processing-pipeline/Fri, 03 Jan 2025 00:00:00 GMTSpans, context propagation, head versus tail sampling, and the cardinality decisions that determine whether your tracing bill is a line item or an incident.https://rahiyansafin.vercel.app/writing/distributed-tracing-system/https://rahiyansafin.vercel.app/writing/distributed-tracing-system/Sat, 07 Dec 2024 00:00:00 GMTA concrete Prometheus-style storage path—head data, WAL, encoded chunks, label indexes, blocks, compaction, and cardinality—plus where other time-series engines differ.https://rahiyansafin.vercel.app/writing/how-a-time-series-database-stores-data/https://rahiyansafin.vercel.app/writing/how-a-time-series-database-stores-data/Fri, 15 Nov 2024 00:00:00 GMTSteady-state hypotheses, blast radius controls, abort conditions, and the discipline that separates experiments from outages with extra steps.https://rahiyansafin.vercel.app/writing/chaos-engineering-platform/https://rahiyansafin.vercel.app/writing/chaos-engineering-platform/Thu, 24 Oct 2024 00:00:00 GMTDesigning RabbitMQ service boundaries with owned queues, publisher confirms, transactional outbox and inbox records, bounded retries, backpressure, and recovery tests.https://rahiyansafin.vercel.app/writing/rabbitmq-between-microservices/https://rahiyansafin.vercel.app/writing/rabbitmq-between-microservices/Wed, 02 Oct 2024 00:00:00 GMTWeighted routing, metric gates that actually mean something, analysis windows versus sample size, and why most canary systems fail at the metric check.https://rahiyansafin.vercel.app/writing/canary-deployment-system/https://rahiyansafin.vercel.app/writing/canary-deployment-system/Tue, 10 Sep 2024 00:00:00 GMTHow a fleet of GPS devices turns location pings into a live map, without losing positions, overwriting history, or melting the database.https://rahiyansafin.vercel.app/writing/real-time-gps-tracking/https://rahiyansafin.vercel.app/writing/real-time-gps-tracking/Mon, 19 Aug 2024 00:00:00 GMTPrometheus pull semantics, cardinality, recording rules, alert routing with inhibition, and the difference between a metric that explains an incident and one that pages someone.https://rahiyansafin.vercel.app/writing/monitoring-alerting-system/https://rahiyansafin.vercel.app/writing/monitoring-alerting-system/Sun, 28 Jul 2024 00:00:00 GMTLeader-elected scheduling, a timing wheel, DAG dependencies, and the exactly-once claim that is actually at-least-once plus idempotency.https://rahiyansafin.vercel.app/writing/distributed-job-scheduler/https://rahiyansafin.vercel.app/writing/distributed-job-scheduler/Sat, 06 Jul 2024 00:00:00 GMTTwo identical environments, database migrations that break the contract, and the failure modes that turn a supposedly-safe switchover into an outage.https://rahiyansafin.vercel.app/writing/blue-green-deployment/https://rahiyansafin.vercel.app/writing/blue-green-deployment/Fri, 14 Jun 2024 00:00:00 GMTLiveness, readiness, and heartbeat are not the same test, and conflating them is how a slow dependency restarts your entire fleet.https://rahiyansafin.vercel.app/writing/health-check-heartbeat-system/https://rahiyansafin.vercel.app/writing/health-check-heartbeat-system/Thu, 23 May 2024 00:00:00 GMTShared schema, database-per-tenant, schema-per-tenant, and the row-level security middle ground — with the noisy-neighbour maths that picks the tier.https://rahiyansafin.vercel.app/writing/multi-tenant-saas-architecture/https://rahiyansafin.vercel.app/writing/multi-tenant-saas-architecture/Wed, 01 May 2024 00:00:00 GMTxDS control plane, sidecar versus ambient, mTLS with SPIFFE identity, and the honest reasons a mesh is worth it — and the ones that are not.https://rahiyansafin.vercel.app/writing/service-mesh/https://rahiyansafin.vercel.app/writing/service-mesh/Tue, 09 Apr 2024 00:00:00 GMTTwo-phase scheduling, level-triggered reconciliation, the pod lifecycle, and why a Kubernetes-style control loop is the reusable idea underneath every orchestrator.https://rahiyansafin.vercel.app/writing/container-orchestration/https://rahiyansafin.vercel.app/writing/container-orchestration/Mon, 18 Mar 2024 00:00:00 GMTEnvelope encryption, HSM-backed roots, dynamic database credentials, and why the hard part of secrets management is revocation, not storage.https://rahiyansafin.vercel.app/writing/secrets-management-system/https://rahiyansafin.vercel.app/writing/secrets-management-system/Sun, 25 Feb 2024 00:00:00 GMTFencing tokens, Redlock's pause problem, ZooKeeper's sequential ephemeral nodes, and the honest limits of TTL-based mutual exclusion.https://rahiyansafin.vercel.app/writing/distributed-lock-service/https://rahiyansafin.vercel.app/writing/distributed-lock-service/Sat, 03 Feb 2024 00:00:00 GMTRaft, linearizable reads, watch fan-out, and MVCC — how etcd and Consul actually keep fifty thousand services watching config without falling over.https://rahiyansafin.vercel.app/writing/distributed-configuration-management/https://rahiyansafin.vercel.app/writing/distributed-configuration-management/Fri, 12 Jan 2024 00:00:00 GMT