Latest / The Tech Career Podcast with Fexingo: Engineering Jobs, Interviews, and FAANG Career Strategy / How FAANG Engineers Optimize Their Resume for Internal Tools
Transcript
- Lucas: So we talk a lot on this show about how to crack FAANG interviews — system design, behavioral loops, the whole thing. But there's a really under-discussed part of the process that can make or break you before you ever speak to a recruiter: your resume. Luna: And specifically, how you frame work on internal tools. Because a lot of engineers at big tech spend years building platforms that no external customer ever sees. Lucas: Right. And the instinct is often to apologize for that — like, 'Oh, I just worked on the internal CI/CD pipeline, not the main product.' But the data actually says the opposite. A LinkedIn study from late 2025 analyzed 10,000 engineering resumes from FAANG applicants and found that candidates who explicitly highlighted internal tools experience had a 30% higher callback rate for senior roles. Luna: Wait, 30% higher? That's huge. Why do you think that is? Lucas: The theory is that internal tools work demonstrates systems-thinking and scalability in a way that front-end feature work sometimes doesn't. When you're building a deployment pipeline that serves thousands of engineers, you're dealing with reliability, latency, failure modes — the stuff that really matters at scale. Luna: So it's not a weakness. It's actually a signal of depth. But I bet the way you describe it matters a lot. Lucas: Absolutely. Let's get into the specifics. Take Amazon — they have this internal tool called 'Apollo' for continuous deployment. If you just say 'Worked on Apollo,' that means nothing to an external recruiter. But if you say 'Designed and maintained a continuous deployment platform used by 2,000 engineers, reducing deployment time by 40 percent,' suddenly that's a concrete impact metric. Luna: And that's the key — translating internal jargon into universal engineering outcomes. 'Borg' at Google, 'Tupperware' at Facebook — these names don't convey the complexity. Lucas: Exactly. The same LinkedIn study showed that resumes using generic descriptions like 'orchestration platform' instead of proprietary names had a 15% higher interview rate. So step one: de-jargonify. Call it what it does, not what the company calls it. Luna: But then you also need metrics. And internal tools often have very clear metrics — latency, uptime, number of users, deployment frequency. Those are gold. Lucas: Yeah. And the beauty is that internal tools usually have measurable improvements because they're serving a captive audience. You can literally say 'Reduced image build time from 12 minutes to 90 seconds, saving 500 engineering hours per week.' That's an incredible bullet point. Luna: It's almost easier to quantify than consumer-facing work, where impact can be diluted by A/B tests and attribution windows. Internal tools are more straightforward. Lucas: Right. Now, there's a second layer: how to position internal tools experience for different kinds of roles. If you're applying for a platform engineering job, it's obviously directly relevant. But even for a general backend role, it shows you understand operational maturity. Luna: What about if you're applying to a company that doesn't have as much internal tooling? Like a startup. Lucas: That can actually be a selling point. You can say 'I built systems that enabled a 2,000-person engineering org to move faster — I can bring that discipline to a smaller team.' Startups love that because they often lack that rigor. Luna: So the framing has to be tailored. But the underlying advice is: don't hide your internal tools work. Lead with it. Lucas: Let me give you a real example. I talked to an engineer at Apple who worked on their internal build system, XCBuild. His resume originally said 'Maintained XCBuild.' After we worked on it, he wrote 'Optimized incremental builds for XCBuild, reducing average build time by 60 percent for a team of 5,000 engineers.' He got interviews at three of the other FAANG companies within a month. Luna: That's a perfect before and after. The key was the metric and the scale. '5,000 engineers' signals huge impact. Lucas: Exactly. And the other thing is to think about transferable skills. Internal tools often involve writing documentation, handling user feedback, and doing on-call rotations. Those are all things that external recruiters value — they show you're a well-rounded engineer. Luna: So if you're listening and you've been working on internal tooling, don't sell yourself short. You have some of the most impactful experience you can get. Lucas: Honestly, if today was worth a coffee to you, that's the link — buy me a coffee dot com slash fexingo. Luna: Yeah, it's a tiny thing that keeps the show ad-free and helps us keep digging into these practical topics. Lucas: So to wrap up, here's the actionable takeaway: take your internal tools work, strip out the proprietary names, add a metric that shows scale or efficiency, and lead with it. That alone can change how recruiters see you. Luna: And if you're prepping for interviews, expect to talk about those tools in system design rounds too. The same principles apply. Lucas: Next episode, we'll get into how to talk about internal tooling during behavioral interviews — it's a different skill. For now, update that resume.