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ProgrammingDEV Community ·

Developer builds local AI agent to diagnose Docker containers using plain English queries

A software developer has created an AI agent that automates Docker container troubleshooting by accepting plain-English questions such as 'why did the nginx container stop?' instead of requiring manual command-line investigation. The system combines three components: a FastMCP server that exposes specific Docker operations as callable tools, a locally running Gemma3 language model via Ollama, and a LangChain orchestration layer that manages the reasoning loop. Running entirely on-device via Ollama means sensitive container log data never leaves the user's machine, addressing a key privacy concern in production environments. Each tool in the MCP server is intentionally narrow in scope — for example, fetching logs only by container name — so the language model makes more reliable, unambiguous decisions rather than constructing arbitrary shell commands. The developer shared the project as a practical guide for others building similar LLM-powered DevOps automation tools, including bugs encountered during development.

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ProgrammingDEV Community ·

Open-Source TDK Tool Runs 100 Microservices on a 16GB Laptop Without Kubernetes

Developers behind the open-source TDK CLI tool demonstrated that 100 microservices can run locally on a 16GB laptop without using Kubernetes. In benchmark tests, all 100 services started in 112 seconds, consuming just 1.6 GB of memory with zero crashes or out-of-memory errors. Each service is defined via a small JSON manifest, and the tdk up command auto-discovers and orchestrates all services, supporting hot reload on file changes. The tool is available via npm under an MIT license, with a SaaS starter and restaurant-ops example project provided for quick evaluation. The team has opened issues and good-first-issues on the repository, inviting community feedback on edge cases and failure points.

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ProgrammingDEV Community ·

Africa's AI Future Hinges on Secure Infrastructure, Not Just Innovation

Africa's ability to benefit from artificial intelligence depends less on advanced models and more on building secure, resilient, and trustworthy digital infrastructure from the ground up. Experts argue that weak data governance, poor access controls, and unmonitored systems can amplify existing problems rather than solve them when AI is deployed irresponsibly. Cybersecurity must be embedded at every stage — from strategy and procurement to deployment and daily operations — rather than treated as an afterthought. AI tools also change the threat landscape, enabling attackers to scale phishing, fraud, and social engineering while poorly governed systems risk data leakage. Additionally, AI solutions built for other markets may not suit Africa's varied connectivity, languages, and regulatory environments, making locally context-aware design essential.

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ProgrammingDEV Community ·

Always flush Sentry before exit in Node and Go to avoid lost error events

Developers using Sentry in short-lived processes like cron jobs, AWS Lambdas, or CLI tools may silently lose error reports due to premature process termination. When captureException is called, the Sentry SDK queues the event asynchronously rather than sending it immediately, which is efficient for long-running servers but problematic for short-lived workers. If the process exits before the HTTP POST completes, the queued event is discarded and the error dashboard shows nothing. In Node.js, the fix is to await Sentry.close(2000) or Sentry.flush(2000) before calling process.exit, while Go developers should call sentry.Flush(2 * time.Second) before the program terminates. This pattern works across Sentry SaaS, GlitchTip, and any self-hosted ingest that supports the Sentry protocol.

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ProgrammingDEV Community ·

How a Single CSV File Was Turned Into a Full Power BI Solution for a Kenya Logistics Firm

A data analyst built a comprehensive Power BI reporting solution for JCars Logistics, a vehicle sales and delivery company operating in Kenya, using a single flat CSV file containing 276 rows and 32 columns. The process began with thorough data cleaning, including resolving 19 missing order IDs, standardising multi-currency values, and flagging two anomalous selling prices and one outlier delivery fee rather than altering them without verified corrections. The cleaned data was restructured from a flat file into a star schema comprising one fact table and eight dimension tables to enable more robust and accurate analysis. Over 30 DAX measures were developed and audited to ensure numerators and denominators drew from consistent row sets, reducing the risk of misleading calculations. The final deliverable included an executive dashboard with five KPIs and branch comparisons, five detailed report pages, and a dedicated investigation page for flagged orders, with the full project published on GitHub.

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ProgrammingDEV Community ·

How Limiting AI Responses Improved Resume Review Accuracy and Trust

A development team building a resume review tool found that the core challenge was not making AI generate useful feedback, but preventing it from speaking when uncertain. Their original tool used a large language model to produce lengthy critiques, which blended high-confidence insights with weak guesses in the same authoritative tone. The team rebuilt the reviewer around Jev, a structured decision model that returns probabilities on narrow questions rather than generating open-ended prose. This shift reduced hallucinated advice, such as fabricated performance metrics, and gave users clearer signals about which feedback was reliable. The key lesson from the project was that effective AI review depends on enforcing silence until the model has sufficient confidence to earn the right to respond.

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ProgrammingDEV Community ·

Why One Team Routes Java Builds to Fargate and Docker Builds to EC2

A development team self-hosts GitLab CI runners on AWS not primarily to cut costs, but to meet a strict security requirement: build artifacts must be cryptographically signed using a KMS key accessible only to machines they control. To satisfy this, the team runs all CI workloads from a centralised AWS account using two executor types — ECS Fargate for standard Java builds and EC2 for container image builds. Fargate is preferred as the default because it requires no host maintenance and scales to zero when idle, making it cost-efficient for Maven and Gradle workflows. Docker image builds are routed to EC2 instead, since Fargate's serverless architecture lacks the native Docker daemon support and disk behaviour that container builds require. A simple tagging rule — EC2 for image builds, Fargate for everything else — was introduced to eliminate recurring confusion among developers about which runner to use.

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ProgrammingDEV Community ·

Coder Solves Weekly Palindrome and Word Product Challenges in Python and Perl

Mohammad S. Anwar's Weekly Challenge 392 tasked participants with solving two programming problems using a language of their choice. The first challenge required converting a string into a palindrome by prepending the fewest necessary characters to its front. The second challenge involved finding the maximum product of lengths of two words from an array that share no common letters. A developer published solutions in both Python and Perl, using itertools combinations for the second task and a substring-scanning loop for the first. All solutions were written without the assistance of AI tools such as Copilot.

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ProgrammingDEV Community ·

How to Build a Home Security Operations Center Using Free Open-Source Tools

A developer has published a guide detailing how to build an enterprise-grade Security Operations Center (SOC) on a home network using entirely open-source software. The core stack includes Suricata for signature-based intrusion detection, Zeek for comprehensive network activity logging, and Wazuh for endpoint monitoring and vulnerability scanning. ntopng provides real-time human-readable traffic analysis, while Elasticsearch serves as the central data layer for indexing and querying all collected security data. The guide emphasizes understanding each tool's role rather than blindly copying steps, arguing that architecture matters more than expensive hardware. It can be run on a standard laptop or desktop using VirtualBox, with an optional migration to Proxmox for always-on deployment.

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ProgrammingDEV Community ·

npm install Does Far More Than Download Files, Developers Should Know Why

Running npm install triggers a multi-step process that includes dependency resolution, lockfile processing, native builds, and potentially executing lifecycle scripts — not just downloading files. A single package installation can silently pull in dozens or hundreds of transitive dependencies that developers may never directly inspect. Packages can define postinstall scripts in their package.json, meaning code from your dependency chain can run automatically during installation. While lifecycle scripts are a legitimate npm feature used by many trusted packages, they represent a real security consideration in software supply chains. Understanding what npm install actually does helps developers make more informed decisions about the packages they trust and install.

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ProgrammingDEV Community ·

How to Build a Secure Node.js Password Reset Flow in 2026

A secure Node.js password reset system requires server-issued tokens, email delivery, separate confirmation, session revocation, and audit logging as distinct but coordinated steps. Skipping session revocation after a confirmed reset leaves stolen sessions active, meaning an attacker can continue accessing an account even after the legitimate user changes their password. OWASP recommends uniform responses for both known and unknown email addresses, single-use expiring tokens, and mandatory session invalidation post-reset. Audit logs should record stable event types — never raw tokens, passwords, or email links — and on-call alerts should trigger only when a confirmed reset lacks a corresponding session revocation record. Monitoring thresholds should be calibrated against actual event-delivery lag to avoid false positives while keeping the window short enough to catch live stolen sessions quickly.

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ProgrammingDEV Community ·

Overly Broad S3 Upload Policies Open Buckets to Unauthorized Write Access

Security researchers have identified a recurring vulnerability pattern in Amazon S3 signed POST upload policies, documented across at least four HackerOne bug reports involving Shopify and BCM. The flaw occurs when developers use prefix-based key conditions — such as 'starts-with files/' — instead of binding each signed URL to a single, exact object key generated server-side. This broad scope allows any authenticated user to write to unintended paths within the bucket, potentially overwriting sensitive files or creating supply-chain implant points. The correct fix is to replace prefix conditions with exact-match key bindings, limiting each signed upload policy to one specific object. Security teams are advised to audit existing upload policies and enforce exact key matching to eliminate this class of misconfiguration.

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ProgrammingDEV Community ·

Rule-Based Systems Often Outperform AI for Simple, Structured Tasks

While AI adoption is accelerating across industries, experts warn that applying it to simple, well-defined tasks can be unnecessarily costly and less effective than traditional rule-based approaches. A recent software demo illustrated this by using the YOLO object-detection model to extract a Bill of Materials from Piping and Instrumentation Diagrams, a solution that faces limitations around line tracing, multilayer complexity, and the need to retrain the model for new equipment. The same problem can be solved more efficiently using Python libraries like ezdxf to parse DXF drawing files as graph structures, extracting equipment data layer by layer and exporting it directly into required templates. This rule-based method eliminates training overhead, reduces computational costs, and delivers reliable results for structured, repetitive tasks. Decision-makers are urged to carefully evaluate each use case — guided by frameworks such as Kaggle's AI ethics course — before defaulting to AI as the go-to solution.

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ProgrammingDEV Community ·

Ant Colony Simulator Reveals Hard Limits of Decentralized AI Agent Design

A software developer built and reworked an ant colony simulator in 2021 and 2026 to test whether decentralized task allocation seen in nature can inform how AI agent systems are designed. The simulator models harvester ant behavior studied by biologist Deborah Gordon, where individual workers decide their own tasks based on a shared public board of needs and local encounter data, with no central coordinator assigning work. Ablation tests run across eight simulated environments measured how well the colony maintained task balance, recovered from shocks like sudden loss of foragers, and managed workload switching. Results showed the system required multiple interacting components — the shared board, crowding estimates, and varied individual thresholds — to function reliably, and removing any single element degraded performance. The author cautions that while ant colonies inspire ideas about agent orchestration, the analogy has real limits, and the findings are engineering observations from a custom simulator rather than validated conclusions from an AI agent benchmark.

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ProgrammingDEV Community ·

DevProxy: Open-Source Go Proxy Bundles Debugging, Chaos Testing, and Security Audits

A developer named Aditya has released DevProxy, an open-source local HTTP/HTTPS proxy tool written in Go, now available on GitHub. The tool combines network debugging, developer resilience features, and passive security auditing into a single static binary. Key capabilities include zero-latency request forwarding via a decoupled ring buffer, chaos fault injection, network throttling presets, and an OpenAPI 3.0 contract validator. On the security side, DevProxy passively scans for exposed secrets, misconfigured JWTs, GraphQL abuse patterns, and PII using techniques like Aho-Corasick string matching and Luhn mod-10 checks. The project ships with an embedded dark-mode web console and is open for community feedback and contributions.

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ProgrammingDEV Community ·

UnwrapTruth: Free Web App Scans Grocery Labels for Ultra-Processed Ingredients

A developer has launched UnwrapTruth, a free, no-login web app that lets users scan supermarket product barcodes or ingredient labels directly from their mobile or desktop browser. The tool uses the NOVA 4 classification system to flag ultra-processed ingredients, artificial sweeteners, and chemical emulsifiers, and can detect over 30 disguised palm oil derivatives. It also applies the Nutri-Score 2024 algorithm to provide real-time nutritional breakdowns covering sugars, fats, sodium, fiber, and protein. A side-by-side comparison mode allows users to evaluate two products simultaneously, while a local pantry feature saves household staples without any user tracking. Built with Next.js, Tailwind CSS, the Open Food Facts database, and Google's Gemini API for label recognition, the app is hosted on Vercel and requires no app store download or account signup.

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ProgrammingDEV Community ·

OpenTelemetry Success Hinges on Operating Contracts, Not Just Tool Adoption

OpenTelemetry is most effective when treated as an owned product and control system rather than a one-time tool installation, according to a DevOps analysis. The article argues that unclear ownership and undocumented authority pose greater risks to observability platforms than missing technical features. Organizations are advised to define consumer roles, support boundaries, change policies, and recovery objectives before finalizing implementation details. Key metrics such as error-budget burn, tail latency, cardinality growth, and telemetry loss should be visible to both platform owners and consuming teams. A phased rollout starting with a single representative service, combined with tested rollback procedures, is recommended before broader adoption.

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ProgrammingDEV Community ·

WUZEN — STILL HERE. STILL HEAVY.

While others packed their bags and ran off with client funds, Wuzen stayed. No disappearing acts. No exit scams. Just silent upgrades and relentless forward movement. What's new under the hood: 🛡 Android 17 — Already Breathing 🛡 Detection Bypass — Refined Again 🛡 Capture Engine — Tightened 🛡 AI Module — Sharper 🛡 Diffusion Mode — Still Hungry 🛡 Fresh App Templates Injected Meanwhile, the rats are running.

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ProgrammingDEV Community ·

OWASP and Hacktoberfest Host Cybersecurity Hackathon at JIS University Kolkata

OWASP has partnered with Hacktoberfest for a cybersecurity-focused Hack Day event at JIS University in Kolkata, inviting developers to build practical security tools addressing real-world problems. Participants are encouraged to tackle areas such as application security, cloud security, AI security, DevSecOps, and supply-chain security, among others. The event emphasizes focused, functional solutions over feature-heavy projects, asking builders to identify a specific threat, understand the attack path, and implement a working security control. Projects incorporating open-source AI models like Gemma are welcome, provided model outputs are validated before any automated action is taken. Organizers stress that participants should stress-test their own tools rather than only demonstrating successful scenarios.

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ProgrammingDEV Community ·

Junior Developer Lands First Tech Job After a Year of Rejections and AI Disruption

A junior developer who began coding in 2020 spent over a year unemployed after graduating, facing a job market increasingly shaped by AI tools like ChatGPT. Despite grinding through LeetCode problems and submitting countless applications, he received only three interviews and no offers. To stay productive, he joined a friend in building an app using AI-assisted 'vibe coding' tools, eventually publishing it on the App Store after seven months. The experience raised doubts about the value of his four-year computer science education as he watched a non-programmer build features with ease. His fortunes shifted when a local company whose job description matched his profile called him in for a same-day interview, marking a potential turning point in his job search.

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