Engineers Archives

Tech Optimizer

July 22, 2026

Migrating mission-critical payments at Nubank to Amazon Aurora PostgreSQL

Nubank, a digital banking platform with approximately 135 million customers in Brazil, Mexico, and Colombia, faced challenges with its payment infrastructure due to inefficiencies in managing 7.5 TB of self-hosted PostgreSQL databases. Queries took over 13 minutes to execute, and replication lags exceeded four minutes during peak times. To address these issues, Nubank evaluated database solutions based on developer productivity, operational efficiency, performance reliability, and scalability. They selected Amazon Aurora PostgreSQL-Compatible Edition for its compatibility, performance improvements, and automated features. The migration to Aurora was facilitated by AWS Database Migration Service (AWS DMS), which minimized downtime and allowed for efficient transition. Post-migration, query performance improved significantly, with some queries executing up to 1,900 times faster, and overall end-to-end service latency decreased, enhancing customer experience. The migration resulted in a 25 percent cost reduction and ensured compliance with regulatory requirements.

Tech Optimizer

July 21, 2026

I Built My Second ETL Pipeline. This Time, I Started Thinking Like a Data Engineer

The author transitioned from a data analyst role to a data engineer, creating a 12-month self-study roadmap focused on learning by building projects. The first project was a GitHub ETL pipeline, which evolved from a simple Python script to a more complex system using SQLite and GitHub Actions for automation. The author realized that the challenges of data engineering lay in system design and orchestration rather than just writing ETL logic. For the second project, the author built an automated RSS ingestion pipeline to explore engineering decisions in creating a reliable data pipeline. The project emphasized the importance of separating application responsibilities from orchestration tasks, leading to the use of Docker for consistent execution environments and Kestra for orchestration. The author validated each component of the project incrementally: first the Python ETL, then PostgreSQL, followed by Docker, and finally Kestra. This approach ensured that each layer functioned correctly before adding complexity. The final architecture included distinct responsibilities for each component: Python for data processing, PostgreSQL for data storage, Docker for execution, and Kestra for orchestration. The author learned that effective engineering involves considering system reliability, error handling, and observability, shifting the focus from merely writing code to designing entire systems. The experience transformed the author's mindset, emphasizing the importance of incremental building and the separation of execution and orchestration responsibilities.

Winsage

July 19, 2026

Windows 11 Secure Boot is a messy ride on older PCs, and even Microsoft can’t fix it

Microsoft held an OEM Secure Boot Office Hours event with manufacturers like Acer, Asus, Dell, and HP to discuss issues related to the Windows 11 Secure Boot 2023 certificate rollout. Many IT administrators left with unresolved concerns, particularly regarding Secure Boot certificate errors. Participants reported persistent problems, including failures of suggested solutions from official documentation to apply to their hardware configurations. Ed Tittel shared his experience with compliance issues related to CA-2023 certificates, noting that ASUS motherboards sometimes required Secure Boot to be disabled temporarily, while MSI models exhibited erratic behavior. ASRock systems needed manual key resets, and documentation was lacking. Devices from Dell, HP, and Lenovo performed better but still faced staggered rollouts and required multiple reboots for BIOS updates. Specific issues raised included HP's BitLocker recovery loop persisting even with the latest BIOS, challenges with legacy device support from HP, devices showing Secure Boot Status as Unknown, and failures in updating the KEK on HP EliteBooks. Some questions from IT administrators regarding Dell and HP went unanswered during the session. The experiences highlighted a trend of Secure Boot issues across multiple OEMs, not limited to a single vendor. IT administrators are advised to pilot updates on representative hardware, back up BitLocker recovery keys, and consult OEM-specific advisories. The unresolved issues reflect common challenges faced by users, indicating that problems with Secure Boot certificate deployments are widespread across various manufacturers.

Winsage

July 18, 2026

Windows 11 Secure Boot certificates have expired, and Microsoft says what to do next

Microsoft held its OEM Secure Boot Office Hours event on July 15, where engineers collaborated with OEM representatives from companies like Acer, Asus, Cisco, Dell, and HP. IT administrators were able to ask live questions about the Secure Boot 2023 rollout. The discussion thread became a detailed technical record, especially following the expiration of the first certificates three weeks prior. Concerns raised by IT admins included BitLocker recovery loops, stuck confidence ratings, and unhelpful Intune error codes. Key facts include: - Devices offline for long periods will still receive the 2023 certificates upon reconnecting to Windows Update. - Devices with existing 2023 certificates in firmware will switch to the new boot manager after the latest Windows patches are installed. - A new script, Detect-SecureBootCertUpdateStatus.ps1, is available in Windows for checking certificate status. - BIOS updates may reset a device’s confidence rating to unrated, which is normal and does not indicate certificate failure. - Admins should edit the AvailableUpdates registry key, not the AvailableUpdatesPolicy, which is managed by Intune and Group Policy. - A licensing bug affecting AvailableUpdatesPolicy on devices upgraded from Pro to Enterprise was resolved by Microsoft in 2026. - BitLocker recovery is not typically linked to the certificate update process but may relate to firmware or PCR issues. - Dell and HP provided guidance on which BIOS versions include the 2023 certificates for their newer models. - Older HP EliteBook 840 G5 units require a manual update package for the new certificates. - Eligible devices can still receive the 2023 certificates in the future, and Surface devices released from 2024 onward come pre-equipped with them. - Microsoft confirmed that devices running 2011 certificates will not lose the ability to receive the 2023 chain. - The Microsoft Corporation KEK CA 2011 and Microsoft UEFI CA 2011 certificates have expired, with the Microsoft Windows Production PCA 2011 set to expire on October 19, 2026.

Winsage

July 18, 2026

Windows 11’s massive July 2026 update fixes 570 vulnerabilities and shows how AI is quietly reshaping Patch Tuesday itself

Microsoft's July 2026 Patch Tuesday update for Windows 11, identified as KB5101650, addresses 570 vulnerabilities and upgrades Windows 11 to version 25H2 (build 26200.8875) and version 24H2 (build 26100.8875). The update includes critical fixes for BitLocker and File Explorer, targeting vulnerabilities that could enable remote code execution. Microsoft's MDASH tool, which uses AI for vulnerability analysis, has helped uncover 16 vulnerabilities in networking and authentication components. The update also introduces non-security enhancements like Point-in-time restore and improved Bluetooth reliability. Microsoft emphasizes the need for users to install updates quickly due to the rapid evolution of AI technology that benefits malicious actors.

AppWizard

July 15, 2026

Ramp’s billionaire CEO ignores résumés and Ivy League degrees—he’s more interested in engineers who built Minecraft servers as teens

Eric Glyman, cofounder and CEO of Ramp, advocates for a hiring philosophy that prioritizes "proof of work" and exceptional drive over traditional qualifications and résumés. He believes valuable hires often come from unexpected backgrounds, citing Ramp engineers who demonstrated dedication through their involvement in Minecraft. Ramp actively seeks talent on platforms like GitHub and through referrals from individuals who know candidates well. Glyman emphasizes the economic advantages of hiring younger talent before they accumulate extensive experience, which can inflate their market value. He also focuses on candidates' long-term motivations and alignment with the company's mission. Glyman's approach aligns with other influential CEOs, such as Elon Musk, who also prioritize tangible evidence of a candidate's abilities over résumés.

AppWizard

July 15, 2026

You Can Install Even More Apps On Android Auto Using This Simple Trick

Android Auto has introduced a new app that allows users to read PDF documents in their vehicles. Users can enhance their Android Auto experience by sideloading apps, which involves installing applications not officially available on the platform, such as CarStream for YouTube playback. To sideload apps, users must enable Developer Mode on their Android device and Android Auto, allowing access to hidden features and enabling the installation of third-party apps. The process includes navigating to Settings, tapping the Build number multiple times to enable Developer Mode, accessing Developer Settings in Android Auto, and enabling Unknown Sources. Users can then download the Android Auto Apps Downloader (AAAD) from GitHub, which is an unofficial app storefront that allows downloading additional applications. AAAD is free with optional in-app purchases, and a PRO version is available for a one-time fee. Sideloading can unlock various functionalities, but it is recommended for advanced users due to potential complications.

Winsage

July 10, 2026

Microsoft goes all in on new AI-powered Windows security strategy – what it means for you

Microsoft is integrating artificial intelligence into its vulnerability management processes to enhance cybersecurity, particularly for its Windows operating system used by over 1.5 billion devices. The company is implementing an automated, AI-driven approach to identify vulnerabilities earlier in the development cycle, allowing for quicker fixes. Microsoft has developed a cloud-based scanning system called MDASH, which has identified 16 vulnerabilities since its introduction, four of which were critical and promptly patched. AI tools are being embedded earlier in the software development lifecycle, and Microsoft is updating its Secure Development Lifecycle best practices to address potential AI-enabled attack techniques. The shift towards an AI-enhanced system will lead to an increase in the volume of security updates, requiring enterprise administrators to adopt more agile approaches to testing and deploying updates. Microsoft has introduced a feature called Known Issue Rollback (KIR) to help admins revert problematic changes. The company emphasizes the importance of human oversight in evaluating AI findings and making informed decisions.

Winsage

July 9, 2026

Evolving Windows vulnerability management to meet the speed of AI-powered discovery

Microsoft is enhancing its security measures for Windows by integrating artificial intelligence (AI) to improve the discovery and analysis of vulnerabilities across its codebase. This includes the use of a multi-model agentic scanning harness (MDASH) that employs various AI models to identify and validate potential vulnerabilities efficiently. A dedicated cloud infrastructure supports this scanning process, which aims to minimize false positives and reduce the time from discovery to customer protection. The company collaborates across divisions to promote AI-powered tools and practices, refining its internal systems to integrate vulnerability discovery into development processes. This includes updating Secure Development Lifecycle (SDL) practices to address AI-enabled attack techniques. Customers can expect an increase in security updates as AI enhances vulnerability discovery capabilities. Windows updates undergo rigorous validation through programs like the Security Update Validation Program (SUVP) to ensure quality and compatibility. Microsoft also offers tools like Known Issue Rollback (KIR) for quick reversion of changes if issues arise during updates. Customers are encouraged to stay current with security updates and utilize resources like the Security Update Guide for prioritizing protections. To facilitate smoother update processes, Microsoft provides optional non-security preview releases for compatibility testing and employs modern management capabilities like Windows Autopatch to automate security updates. Azure Arc enables rebootless updates for Windows Servers, while Microsoft Defender and Intune help manage vulnerabilities and compliance across endpoints. Overall, Microsoft is committed to continuous improvement in its security practices to adapt to the evolving threat landscape and ensure customer protection through timely updates.

Winsage

July 9, 2026

Microsoft’s big cybersecurity plan means more security updates for your Windows machine

Microsoft is integrating artificial intelligence into its security protocols to enhance the safety of Windows users. AI will play a crucial role in the entire lifecycle of security patches, from discovery to development and deployment, allowing for quicker identification of potential issues and more comprehensive updates. Microsoft's AI models are designed to work alongside engineers, improving the efficiency of pinpointing vulnerabilities and resulting in a higher volume of security updates with each release. This integration aims to improve the speed of flaw recognition and enhance the overall robustness of the Windows operating system.