Open-source static analysis for security.

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Working at Semgrep

Semgrep is a fast, open-source, static analysis tool for modern languages. With 1,000+ existing rules and simple-to-create custom ones, it finds the bugs that matter. Semgrep can run anywhere: in CI, your editor, or the command-line. Plus, with dedicated infrastructure from r2c, it’s easy to deploy, manage, and monitor Semgrep at scale.

Tech stack


How engineering works at r2c

How are the teams structured?

The teams right now are small enough that each of those teams has one engineer manager, and then there's about five to nine people on each team. The teams are structured based on their technical expertise. We have three main teams:

  • Our program analysis team is mostly OCaml wizards who are writing the core parsing and matching engine.
  • Our security research team consists of software engineers and security experts who are doing a mixture of things, but primarily writing rules and making sure that the tool is producing great results for our customers.
  • Our application team is a team of product-focused engineers and builds the web product in typed-python, flask, react and typescript.

And then we have one cross-functional team, which focuses on our second product, Semgrep Supply Chain, which does third party code dependency scanning. That one is a mix where we've pulled a couple people from each team.

What tools do engineers use?

  • Design: Figma
  • Source Control: GitHub
  • Issue Tracking: Linear
  • Internal Documentation: Notion
  • Incident management: PagerDuty and Datadog
  • Monitoring: Prometheus
  • Communication: Slack
  • Build and Deployment: GitHub Actions and Argo CD
  • Component Design: Storybook

Can developers pick their own tools?

We have a well documented path where we give everyone a Mac and gently nudge people to use VS Code, but that's mostly just because it's easy to get help from other people on the team. It’s not a requirement - many people are on Linux, and some use Emacs or Vim or whatever they want.

If someone suggested a new tool that would affect the wider team, it'd be considered on a team by team basis. We often enjoy the search for new tools and if the team adopts it then it's accepted.

How does the development process work? What's the process for working through bugs, features and tech debt?

The engineering manager is responsible for what the team works on. We have a loose agreement with our product team that we'd spend about 50% of time on new features and 50% of our time on a combination of support and tech debt, which seems to work pretty well.

We are a small startup, so we try to do what makes sense. One thing that we do is twice a year we have a hackathon or a full hack week where everyone in the company from sales to engineering is encouraged to spend that week to try out new things and demo that to the company. We have pretty great prizes and then usually at least two or three projects from that hack week then get pulled into the main work.

We roughly follow an agile framework. We're trying to do one week sprints and ship things. Once a month, we do a bug squashing day or bug squashing week, just try to push those through. But it's not mandated, managers of the teams to figure out what their team needs to do that month.

We do monthly goal setting and quarterly company strategy goals. We have metrics and we use the term “singular goal” a lot for the north star metric. We try to set SMART goals and try to hold ourselves accountable to make sure we are actually creating an impact with our work.

How does code get reviewed, merged, and deployed?

To request a code review, engineers use the GitHub code review feature to tag people who are relevant. We require all the tests to pass before it can either be auto merged or unit merged in. As soon as it is merged, it will be deployed to staging. And then approximately once a day, staging automatically gets deployed to production; we have one click revert if we need to go back.

There's two ways to do rollbacks. One would be just undoing the change through code. We try to have deterministic atomic builds. But database migrations don't quite work that way - we try to write up and down migrations and then if need be, we use Argo CD to deploy different versions. We can also simply point production to old revisions, which are still available if needed.

What is the QA process?

We've prioritized end to end and integration testing. We have a few functional tests for the core workflows that are essential, as well as other tests that check if the website is down or if we can make comments on the core workflows in the product.

We’re also just rolling out a new feature to allow customers to opt-in to beta releases and get early access to new functionality.

What are some recent examples of interesting development challenges solved by internal teams as part of building the product?

We use Treesitter, which is this technology that GitHub wrote to power their Atom code editor, and now powers a lot of modern code editors. That's all open source, so we were able to bring that in and use that as our parser. That allowed us to add 17 languages to Semgrep very quickly.

In the context of writing rules, we've built a pretty interesting editor workflow where people can take other people's rules and collaborate on it, tweak it, make it better and share it back. So when the Log4J incident happened, we had two actual external community members who were going back and forth together working to find the best pattern to accurately detect Log4J with Semgrep.

Another interesting challenge that we faced was when we wanted to implement impersonation. We use SpiceDB, which is an open source fine-grained permissions database. We built a microservice that lets us do impersonation in a way that's auditable and traceable so our customer success engineers can impersonate an organization or a user when we need to reproduce issues.

How does on-call work?

We have three on-call rotations. For the open source part, there's an on call that's mostly doing the release process. Every engineer, including the team lead, is part of the on-call rotations - everyone gets a chance to carry a little bit of that support, and the same thing is true for the rule writing team, our security research team and our application team. When you are on call here, you're really mostly just a traffic cop whose job is to fix easy things. Otherwise, you're running an incident and you're trying to pull in engineers from other teams to help you solve it, and get support from our SREs when needed.

That's a pretty standard on-call process. For us, the philosophy of on-call is always how do you give engineers freedom and responsibility? As we move down the infrastructure, we have individual microservices where it is easy to identify the service owner, then that way they get paged first if an incident occurs.

Hiring process at r2c

How does the application process work? What are the stages and what is the timeline?

Candidates apply through our job website. Our team reviews the application within two weeks and if we want to move forward, we'll reach out. The application process consists of following steps:

  • Initial call, usually with a recruiter.
  • Chat with the hiring manager, who evaluates the technical skill of the candidate either by a live coding interview or a take home test.
  • Virtual onsite interviews which focus on software design, coding, debugging, or mentorship.
  • Final interview with one of the founders where candidates talk about our mission and values.

What is the career progression framework? How are promotions and performance reviews managed?

We do have a pretty extensive framework on the engineering side. Most engineers would come in as an L3 and then get promoted to an L4, L5, L6, etc.

Performance reviews happen twice a year as that's mostly a check just to make sure that we're understanding people's performance. We also do 30, 60, 90 day check-ins for new hires.

We have a formal mentorship program, everybody gets a mentor. Our people team has just started with a round robin arrangement but there's a pairing of people, even across teams and functionally. For example, a couple of engineers are paired up with a sales leader as one of their mentors to talk about professional development and career growth. After this program ends, we'll have a mentee program where more junior folks will help mentor more senior folks.

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