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Category: Construction Engineering

How eero mesh WiFi routers connect to the cloud

This is a guest post by Gabe Kassel, Product Manager for Embedded Software at eero. Relying on a single wireless router to provide internet in every room of the home is like expecting a single light bulb to illuminate the entire house. It’s physics – WiFi radio waves don’t travel through walls or objects easily. The eero Home WiFi System is a new take on home connectivity, bucking the trend of one high-powered device in the center of the home.…

100 High-Rise Towers | AMSYSCO Post Tensioning

AMSYSCO Inc. recently reached an important milestone.  We have 100 high-rise towers (20-stories or more) listed in the ‘Skyscraper Database‘ by the Council on Tall Buildings and Urban Habitat.  All of the towers have post-tensioned concrete in the elevated slabs. To date, 78 high-rises towers are either completed or topped-out.  Another 22 high-rise towers are under construction.  Most of the high-rise towers are located in the Midwest US. Our largest market is in downtown Chicago – the birthplace of the…

100 High-Rise Towers

AMSYSCO Inc. recently reached an important milestone.  We have 100 high-rise towers (20-stories or more) listed in the ‘Skyscraper Database‘ by the Council on Tall Buildings and Urban Habitat.  All of the towers have post-tensioned concrete in the elevated slabs. To date, 78 high-rises towers are either completed or topped-out.  Another 22 high-rise towers are under construction.  Most of the high-rise towers are located in the Midwest US. Our largest market is in downtown Chicago – the birthplace of the…

Towards true continuous integration – Netflix TechBlog – Medium

For the past 8 years, Netflix has been building and evolving a robust microservice architecture in AWS. Throughout this evolution, we learned how to build reliable, performant services in AWS. Our microservice architecture decouples engineering teams from each other, allowing them to build, test and deploy their services as often as they want. This flexibility enables teams to maximize their delivery velocity. Velocity and reliability are paramount design considerations for any solution at Netflix. As supported by our architecture, microservices…

Engineering Stability in Migrations: Moving to Immutable Collections in Uber’s Android Apps

Making models for Android apps frequently involves writing a lot of boilerplate code by hand. This process can be time-consuming, error-prone, and lead to hard-to-spot bugs when done incorrectly. To address this at Uber, we built a custom stack to generate AutoValue models and network clients from Thrift Specs. In this article, we explore how models in Uber’s Android apps ended up being mutable despite using AutoValue; we illustrate some of the pitfalls of mutability and detail a class of…

Enhancing Pinner security with login emails and revoking sessions

Amine Kamel, Emanuele Cesena & Eric Zhang | Pinterest engineers, Security The Pinterest Security team is tasked with keeping the accounts of more than 175 million people safe and secure. We recently added another layer of protection to secure Pinners’ accounts. Now, logging in from a new device or location will trigger an email notification, and all active sessions can be viewed and revoked from the user settings page. Here we’ll describe the system architecture powering the new features. New…

A Modest Proposal to Save California $200 Million

In order to forestall a lot of hate mail, the following blog is written in the tradition of eighteenth-century satirist Jonathan Swift’s essay, “A Modest Proposal.”  It is not meant to be taken seriously.  With that out of the way, I have a modest proposal to save the good citizens of California over $200 million.  That is the estimated cost of a suicide-deterrent net project that is going to be installed on the Golden Gate Bridge, according to a recent…

What Makes a Good Fiducial?

Accountants may have a fiduciary responsibility, but that really has nothing to do with PC board assembly. Change the “ry” to a “ls”, however, and you get fiducials, which does have something to do with PCB assembly. A fiducial is essentially an alignment mark for surface mount assembly machines. High volume assembly requires them to ensure accurate registration and parts placement. Low volume assembly, like we do here at Screaming Circuits, doesn’t necessarily require them. (Some low volume shops do,…

In Praise of Doppler Weather Radars

On Mar. 28, 1920, a series of more than 30 deadly tornadoes made widespread paths of destruction through the central and southern U. S. and caused deaths from Michigan all the way to LaGrange, Georgia.  Shortly before 6 P. M., that southern mill town was struck by a tornado with an estimated Fujita rating of F3, which means its winds probably ranged from 158 to 206 MPH.  After wrecking a cluster of worker’s houses, the town’s main mill and factory…

Open Sourcing Screwdriver, Yahoo’s Continuous…

By James Collins, Sr. Director, Developer Platforms and Services, and St. John Johnson, Principal Engineer Continuous Delivery enables software development teams to move faster and adapt to users’ needs quicker by reducing the inherent friction associated with releasing software changes. Yahoo’s engineering has modernized as it has embraced Continuous Delivery as a strategy for improving product quality and engineering agility. All our active products deliver from commit to production with full automation and this has greatly improved Yahoo’s ability to…