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#backend engineering

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22 articles

System Design: Building a Distributed Tracing Platform

Metrics tell you that latency is bad. Logs tell you that something failed somewhere. Traces tell you which request went where, in what order, and where the time actually disappeared. That is why tracing becomes essential…

Apr 18, 202611 min read

Deep Dive

#system design#distributed tracing#observability

System DesignAdvanced

System Design: Building a Service Discovery Platform

In a distributed system, naming a service is easy. Finding a healthy instance of that service, right now, in the right zone, during a deployment, while failures are happening, is the real problem. That problem is service…

Apr 18, 202610 min read

Deep Dive

#system design#service discovery#microservices

System DesignAdvanced

System Design: Building a Session Management Platform

Sessions feel simple until they become a security boundary. A user logs in. The system gives them a token or cookie. Requests work. End of story. Then reality arrives: - one user is logged in on five devices - an access…

Apr 18, 202611 min read

Deep Dive

#system design#session management#authentication

System DesignAdvanced

System Design: Building a Workflow Orchestration Platform

Many backend processes start life as a queue consumer and a couple of retries. That works until the business process gets longer and stranger. Now the flow needs: - wait for payment confirmation - call three downstream s…

Apr 18, 202612 min read

Deep Dive

#system design#workflow orchestration#distributed systems

System DesignAdvanced

System Design: Building a Distributed Cache

At small scale, cache looks like a simple optimization. Put Redis in front of the database, cache a few expensive reads, and enjoy lower latency. At production scale, a distributed cache stops being a helper library and…

Apr 10, 202614 min read

Deep Dive

#system design#distributed cache#redis

System DesignAdvanced

System Design: Building a Distributed Configuration Platform

Most systems begin with configuration as a file. That works for a while. Then one service needs a database URL rotation without redeploy. Another wants per-environment rate limits. A third wants tenant-specific limits. A…

Apr 10, 202611 min read

Deep Dive

#system design#configuration#distributed systems

System DesignAdvanced

System Design: Building a Fraud Detection Platform

Fraud detection is not a single model. It is a decision system that has to operate under latency pressure, incomplete information, adversarial behavior, and messy business trade-offs. If the system is too loose, fraud lo…

Apr 10, 202613 min read

Deep Dive

#system design#fraud detection#payments

System DesignAdvanced

System Design: Building a Payment Reconciliation Engine

Payments look simple from the product surface. A customer pays. The UI says success. The order moves forward. Under the hood, though, the money and the system state do not move in a single atomic transaction. A payment g…

Apr 10, 202616 min read

Deep Dive

#system design#payments#reconciliation

System DesignAdvanced

System Design: Building a Search Indexing Platform

Search gets demoed as a search box. Search gets operated as a distributed data synchronization problem. The hard part is usually not querying Elasticsearch or OpenSearch. The hard part is getting the right data into the…

Apr 10, 202611 min read

Deep Dive

#system design#search#elasticsearch

AI/MLAdvanced

MCP for Backend Engineers: Tools, Agents, and Production Guardrails

MCP, the Model Context Protocol, is useful because it gives AI applications a standard way to connect to tools and context. For backend engineers, the interesting part is not the hype around agents. The interesting part…

Apr 8, 202614 min read

Deep Dive

#mcp#ai agents#tools

System DesignAdvanced

System Design: Building an API Gateway Platform

An API gateway is the front door to your backend. It receives traffic before your services do, which makes it powerful and dangerous. A good gateway centralizes routing, authentication, rate limiting, request shaping, ob…

Apr 8, 20268 min read

Deep Dive

#system design#api gateway#rate limiting

System DesignAdvanced

System Design: Building a Data Export Platform

Data export is one of those features that sounds small until it takes down production. A product manager asks for "Export to CSV." The first implementation runs a SQL query in the web request, builds a file in memory, an…

Apr 8, 202611 min read

Deep Dive

#system design#data export#async jobs

System DesignAdvanced

System Design: Building an Email Delivery Platform

Sending one email is easy. Sending millions of emails reliably, legally, and without damaging your domain reputation is a system design problem. Email delivery touches product workflows, background jobs, third-party prov…

Apr 8, 202610 min read

Deep Dive

#system design#email delivery#queues

System DesignAdvanced

System Design: Building a File Upload Platform

File upload looks easy until production traffic arrives. Users upload huge files, mobile networks drop halfway through, browsers retry, malicious files appear, thumbnails fail, metadata gets out of sync, signed URLs expi…

Apr 8, 202610 min read

Deep Dive

#system design#file upload#object storage

System DesignAdvanced

System Design: Building a Distributed Job Scheduler

A job scheduler sounds simple: run this task at this time. In production, that becomes a distributed systems problem. Nodes crash after claiming work. Clocks drift. Jobs overlap. Cron expressions are ambiguous. Tenants n…

Apr 8, 202611 min read

Deep Dive

#system design#job scheduler#distributed systems

System DesignAdvanced

System Design: Building a Secrets Management Platform

Secrets management looks like a simple storage problem until you operate it in production. At first, the requirement sounds like this: "Store API keys and database passwords somewhere safe." Then real systems arrive. Ser…

Apr 8, 202613 min read

Deep Dive

#system design#secrets management#security

System DesignAdvanced

System Design: Building a Webhook Delivery Platform

Webhooks look simple from the outside: "When something happens, send an HTTP POST to the customer's URL." In production, that sentence becomes a distributed delivery system. Customers have slow endpoints, invalid TLS cer…

Apr 8, 202611 min read

Deep Dive

#system design#webhooks#event driven architecture

System DesignAdvanced

Idempotency Keys in APIs: Retries, Duplicate Requests, and Exactly-Once Illusions

Any API that changes state will eventually receive the same request more than once. Mobile clients retry on flaky networks. Load balancers retry after connection resets. Users double-click. Workers crash after doing the…

Apr 7, 20267 min read

Deep Dive

#idempotency#api design#distributed systems

DatabasesAdvanced

Cache Invalidation Patterns: TTL, Write-Through, Cache-Aside, and Event-Driven Eviction

Cache invalidation is hard because the cache is not the source of truth. It is a copy, and every copy has a consistency problem. The real question is not "how do we make cache perfectly consistent?" The better question i…

Apr 7, 20265 min read

Deep Dive

#cache invalidation#redis#caching

System DesignAdvanced

Production Incident Playbooks: Debugging Latency, Errors, and Traffic Spikes

Production incidents are not solved by heroics. They are solved by reducing uncertainty quickly. When latency jumps, errors spike, or a queue backlog grows, the worst thing a team can do is randomly restart services, add…

Apr 7, 20265 min read

Playbook

#incident response#production debugging#observability

JavaAdvanced

Spring Boot Production Readiness Checklist: Timeouts, Pools, Health Checks, and Observability

Spring Boot makes it easy to start a service. Production makes it clear whether the service is actually ready. A production-ready service is not just one that passes unit tests. It has bounded timeouts, sane thread pools…

Apr 7, 20264 min read

Deep Dive

#spring boot#production readiness#java

System DesignAdvanced

System Design: Building an Audit Log System for Compliance and Debugging

Audit logs answer a simple question: who did what, to which resource, from where, and when? That question matters during security investigations, customer support, compliance audits, data recovery, and debugging. A norma…

Apr 7, 20265 min read

Deep Dive

#system design#audit logs#compliance