Through the stack / 01-01 (Week 4)

This week it's mostly high altitude but with some quite crunchy bits : hexagonal architecture, teams management and new features in AWS.

This is "Through the Stack", a weekly list of links relating to topics relevant to Lead developers (actual or aspiring) working with an internet related product.
We split the content in several sections :

  • Building : writing software (with a focus on Ruby but we won't limit ourselves to it)
  • Making : directly related to Building but more in the soft skills around software such as team lead, team management, methodologies and so on
  • Hosting : getting code shipped, deploying code, tools and stacks to deploy and host
  • Keeping online : this part is all about monitoring, managing incidents and the likes

Many lead developers, tech lead and staff engineers have their hands in many projects and influence many layers in their organisations. This publication is an aim at sharing thoughts and content that are relevant to such profiles.
If you have comments or content to suggest please reach out to us by email .


This is a first, at least this year. I have shared similar posts with friends and colleagues over the years in the past. Now, I am seeing a bigger need for reading, sharing and exchanging about all those topics with peers.
This week it's mostly high altitude but with some quite crunchy bits :

  • Hexagonal architecture at Netflix
  • Hg-Git
  • Accountability and decentralization in teams
  • Some great nuggets for people relying on AWS


This week : no Ruby (told you so) as we stay mostly focused on some methodologies and approaches.

Software engineering

  • The netflix tech blog is a great source of content to learn. Following a request by one of my current teammate I stumbled upon this nice nugget that covers Hexagonal Architecture from a high level and practical level :
  • Alongside the above link I stumbled upon "Contract testing" which is a good name and approach to describe how to test third party API for example :
  • Laurent Baumann @lobau shares a couple of great nuggets of design rules through a small thread on twitter : ; handy to keep in mind when creating content and you are not an experienced designer


  • Hg-git is getting close to a v1.0 ( which prompts me to direct you to Heptapod ( and their efforts to bring gitlab to the mercurial masses


This part is about how we work : on our own or with others.

After years working with different teams with Agile methodologies and remotely those articles are a great to reflect on our practices and how we can try out different things with our teams. Remember : being agile is about refining our ways again and again so we work better together.



  • A first announcement from AWS : Guard Duty is improving and adding a way to detect ec2 credential exfiltration : . This is a great feature : EC2 instances can inherit rights from their role and code on those instances can extract credentials and reuse them, but also ... exfiltrate them. So, GuardDuty will now be able to tell you if another account on AWS is using credentials that come from your EC2 instances. Neat.
  • A second one that is also quite interesting. AWS EFS is a way to share data (as a file system) between EC2 instances, lambdas and other things. You can now replicate EFS volume so that if the primary version of it fails you can jump to its clone :
  • What are indexes in a database ? A question many of use aren't sure how to answer so here is a post to refresh our minds on the topic :

Keeping online


About Imfiny

We are a small studio specialized in helping companies level up their teams and scale up their product. We work through the whole stack : software engineering, infrastructure and, also, team management and technical culture.

You can read more about our work on and .

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