Latest / Career Skills with Fexingo: Hard Skills, Soft Skills, and Future-Proofing Your Career / Every Skill Has a Half-Life Here's How to Invest Yours
Transcript
- Lucas: So we talk a lot about building skills, but here's a question I don't think we've asked: what's the shelf life of the skill you're learning right now? Luna: Shelf life? Like, skills expire? Lucas: Exactly. There's a concept from engineering and pharma called half-life, the time it takes for something to lose half its value. Every skill has a half-life. A 2017 study from the IEEE found that the half-life of a technical skill in software engineering is about two and a half years. Meaning half of what you know about a specific framework or language is obsolete after thirty months. Luna: That's startling. So if I spend six months mastering a React library, two years later it's basically half as valuable? Lucas: Roughly. Now, that varies wildly by domain. The half-life of a financial analyst's Excel skills might be longer, maybe five or six years, because the tool doesn't change that fast. But the half-life of a digital marketer's knowledge of the current Google Ads interface could be eighteen months. Understanding the underlying principles of ad auction dynamics, that lasts much longer. Luna: So the idea is to separate the durable from the perishable. I remember in my first job, my manager told me to learn SQL because 'it's been around for forty years and it's not going anywhere.' He was implicitly talking about half-life. Lucas: Exactly. SQL, Excel, writing, negotiation, systems thinking — those are high half-life skills, sometimes decades. A specific BI tool like Tableau or Power BI might be five to seven years. A JavaScript framework like Svelte? Maybe three to four. And then a specific API or library you use today could be eighteen months. Luna: So the smart career move is to weigh your learning time against the half-life. But if short half-life skills can command higher salaries right now, there's a tension. Lucas: Right, and that's the strategic part. You can't ignore short half-life skills because they're often the ticket in. If every company is hiring for a specific cloud certification, that's a two-year half-life but a six-figure salary. You take it, but you make sure you're also accumulating longer half-life skills underneath. I've seen people do a 70-20-10 split: 70 percent of learning time on short half-life skills for immediate job performance, 20 percent on medium half-life skills that transfer across roles, and 10 percent on very long half-life like first principles, mental models, communication. Luna: That's a practical framework. And it stings when you realize the bootcamp model — learn React in three months — graduates people with a skill that's half gone in two years. They need to keep reinvesting. Lucas: Exactly. And that's actually fine if you know it going in. The danger is assuming a skill you learned five years ago has full value today. A lot of career stagnation comes from mismatched expectations about half-life. People get comfortable with a specific toolset, then the industry moves and they're blindsided. Luna: How do you audit your own skill stack for half-life? Is there a simple exercise? Lucas: I do something I call a half-life inventory. Write down your top five skills used in your current role. Next to each, estimate how many years before half its knowledge is obsolete. Be honest. Then decide: Is that skill earning you a return today? And can you afford to let it decay? If a skill has a two-year half-life but you're using it daily, you're fine, as long as you're cycling. But if a skill has a five-year half-life and you haven't touched it in two years, it's already lost 20 percent of its value. Maybe you need to refresh or let it go. Luna: That's a sobering thought. I think a lot of us overvalue outdated skills on our resume because they once took effort to learn. We cling to them. Lucas: That's the sunken cost fallacy of skills. I've coached people who list 'SEO' as a skill, but they haven't kept up with the last three Google algorithm updates. That skill's half-life has probably halved again. To an informed employer, that's a red flag. They'd rather see someone with fresh, shorter half-life skills than stale long-half-life ones. Luna: So what about soft skills? Communication, empathy, leadership — those seem like they have extremely long half-lives, maybe infinite. Lucas: I think they do, but they also have what I call a 'value half-life' that's actually quite long, but not infinite. Because the context changes. The way you communicate in a remote-first world is different from a co-located office. The principles of clear writing and active listening have been around forever, but the application evolves. So even soft skills require some maintenance. But yes, they depreciate much slower. That's why investing in them is a compound interest play. Luna: Compound interest — that's a great analogy. The earlier you build high half-life skills, the more they pay off over a career. While short half-life skills are more like trading: you get a quick boost but you have to reinvest constantly. Lucas: And that's why a balanced skill portfolio matters. If you're all short half-life, you'll burn out from constant relearning. If you're all long half-life, you may become irrelevant because you lack the current tools to execute. The sweet spot is having a core of durable skills and a rotating set of perishable ones that keep you relevant. Tesla doesn't just build batteries; they also update the software. Think of yourself as both the hardware and the software. Luna: You know, this episode is exactly the kind of thing that makes me appreciate this show. We dig into these career frameworks that have long half-lives themselves — the concepts stay useful long after the examples fade. A couple of listeners have asked how to support the show, and honestly, if you find these episodes useful, even a small contribution helps keep it ad-free and independent. A couple of dollars a month genuinely makes a difference. You can do that at buy me a coffee dot com slash fexingo. No pressure, just if the show adds value to your career thinking. Lucas: I'll echo that. We put a lot of research into each episode, and listener support lets us keep doing that without sponsors. Even a one-time coffee goes a long way. Alright, back to half-life — I want to leave you with one actionable takeaway. Luna: Please. Lucas: Pick one skill you're currently learning. Look up its typical half-life — there are reports from sources like LinkedIn Learning or the World Economic Forum. Then decide: should you invest more time in it, treat it as a short-term boost, or replace it with a longer half-life alternative? Do that audit quarterly. The people who think about half-life end up with careers that don't suddenly expire. Luna: I like that. And I'd add: don't forget to update that half-life as technology changes. The half-life of a skill like prompt engineering is probably measured in months right now. It's a moving target. Lucas: Great point. So keep monitoring. That's the skill of the future — the ability to calibrate which skills to invest in, and when to let go. Thanks for listening, and we'll see you next time.