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A Person with Their Own Color — Irreplaceable Expertise and Identity

🇰🇷KO🇺🇸EN🇯🇵JA
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Introduction: "Describe Yourself in One Sentence"

In a job interview I was once asked, "If you had to describe yourself in one sentence, what would it be?" I hesitated for a long time. "I'm a backend developer" felt too common, and slapping on a grandiose label felt like a lie.

After that day I stewed on it for a while. There are tens of thousands of developers with the same years of experience and a similar stack — what am I remembered for? If the company hit hard times and could keep only one person, why should it be me? The question is uncomfortable but important. It asks the difference between "a replaceable person" and "a person with their own color."

Let's be clear: "color" is not flashy self-promotion or a loud persona. It is the consistent impression created by the areas you are reliably good at and genuinely care about. This piece covers, concretely, how to find and grow that color, and how to avoid the common traps.

Why "Replaceability" Is a Problem

Before the main discussion, let's look a little more deeply at why color matters.

The Cost of Being Replaceable

A replaceable person is always anxious. If you only do what anyone can do, you have no leverage, and you're the first to wobble in a crisis. A person with a vivid color, by contrast, gains both stability and opportunity thanks to the perception "we'd be in trouble without this person." This is not a selfish calculation but a healthy motivation that makes your work meaningful.

Color Is a Source of Self-Efficacy

Having a color also means "I know what I'm good at." This self-awareness greatly reduces the anxiety that comes from work. Instead of vaguely worrying "am I not enough," you can take on new challenges from the firm foundation of "this is an area where I'm strong."

But It's Not Arrogance

Having a color is different from the arrogance of "I'm special." It's closer to the humility of knowing your strengths and weaknesses precisely. Knowing your strengths, you grow them; knowing your weaknesses, you collaborate with others. Color is not arrogance but self-understanding.

What Differentiation Is (and Is Not)

Not Pretending to Be Different, but Actually Being Different

Mistaking differentiation for "looking different from everyone else" gets you lost. Forcing yourself to pick an unusual tech stack, or pinning trendy keywords on yourself like a name tag, doesn't last. Real differentiation comes from "what I naturally do better and dig into more deeply."

One colleague was oddly sincere about something no one liked: incident response and postmortems. When an outage hit, he was the first to rush in, organize the timeline, and document the prevention measures. A few years later he became the first person who came to mind in the company when you said "reliability." It wasn't a special technology, but consistent interest and contribution that built his color.

Consistency over Rarity

The core of color is not having a rare skill but consistently demonstrating the same value. When the impression repeats — "this person sees things through," "this person's writing is always clear," "this person thinks from the user's side" — no matter the task, that becomes your color.

Finding the Intersection of Strength and Interest

Your color usually lives where three circles overlap.

  • What you're good at: areas where you get good results with less effort than others.
  • What you love: areas you dig into unbidden, where you lose track of time.
  • What's needed: areas the market or organization recognizes as valuable.
        Good at
          /  \
         /    \
   [Your color] is somewhere here
        /        \
   Love it ──── Needed

All three overlapping perfectly is rare. But find the point where even two overlap and grow it, and the third often follows over time. Keep doing what you love and are good at, and at some point the market starts to need it.

Questions for Discovery

Questions to ask yourself to find your intersection.

  • What topics do colleagues keep coming to me about?
  • What work do I lose track of time doing?
  • When I was praised, what kind of work was it?
  • What do others find tedious that I unexpectedly enjoy?

If repeated keywords emerge in the answers, your color is hidden there.

The T-Shaped Professional: Balancing Depth and Breadth

A concept you can't skip when talking about your own color is the T-shaped professional.

  • The vertical bar (depth): deep expertise in one field. This is what makes you irreplaceable.
  • The horizontal bar (breadth): broad understanding of adjacent fields. This enables collaboration and expansion.
  Breadth (adjacent fields)
 ┌───────────────────┐
 │                   │
 └───────┬───────────┘
         │
         │  Depth
         │ (core expertise)
         │
         ▼

Depth without breadth makes it hard to communicate outside your field. Breadth without depth makes you the "knows everything, masters nothing" person who can't own anything. The balance matters.

How to Build Depth

Depth comes not simply from "I've done it a long time" but from "I went one step further where others stop." Not stopping at just using a library but reading its internals; not stopping at fixing a bug but tracing it to the root cause. These "one step further" moments accumulate into depth.

How to Build Breadth

Breadth grows from genuinely collaborating with people in adjacent fields. If you're backend, try to understand the language of frontend, infra, and product, and where possible experience their domain directly, even in small ways. Breadth makes your depth "useful."

Reputation Grows from Consistency

Color is ultimately the impression etched in other people's minds — that is, reputation. And reputation is built not from one big achievement but from the repetition of small behaviors.

The Small Signals That Build Reputation

  • Do you keep promised deadlines?
  • Do you honestly say you don't know when you don't?
  • Do you credit colleagues rather than take their work?
  • Do you avoid the difficult tasks?

When these signals repeat hundreds of times, people perceive them as your "default." That is reputation, and that is color.

Reputation Is Not Elastic

Reputation accumulates slowly but collapses fast. Keep trust a hundred times and break it decisively once, and that one time is remembered for a long while. That is why growing your color is another name for "consistency."

Imitation vs. Authenticity

Imitating others during your growth is natural and necessary. The question is whether you stop at imitation or move from there toward authenticity.

Good Imitation, Bad Imitation

Good imitation learns the principle of "why does that person do it that way." Bad imitation copies only the surface output. The good kind isn't copying your mentor's slide deck verbatim, but learning how they analyze the audience and structure the message.

The Turn Toward Authenticity

After enough imitation, you have to ask, "if I were doing this, how would I do it differently?" Follow the right answer, but pass it once through your own experience and values. Those subtle differences accumulate into authenticity. Authenticity isn't suddenly invented; it gradually emerges atop imitation.

The Trap of Personal Branding: Beware Exaggeration

These days the voices emphasizing "personal brand" are loud. There are good sides, but many traps.

The Danger of Packaging Without Substance

It's dangerous when a flashy intro, a fancy title, or a well-polished profile outruns your ability. When marketing overtakes substance, people who have worked closely with you notice quickly. And that gap is the most lethal thing for a reputation. A brand should be the shadow of your ability, not a mask that hides it.

Balancing "Showing" and "Building"

Making yourself known isn't inherently bad. Doing good work that no one knows about is also a loss. The key is the ratio. Someone who builds 90 and shows 10 earns trust; someone who builds 10 and shows 90 is eventually found out.

Authenticity as the Foundation

A sustainable color stands on authenticity. A forced persona takes energy to maintain and eventually cracks. A color that starts from your real strengths and interests stays consistent without effort.

Practices for Finding and Growing Your Color

Abstract resolutions alone won't create a color. Concrete practice is needed.

Build in Public

Appropriately sharing what you do sharpens your color.

  • Write up what you learn on the internal wiki or a blog.
  • Build and share small tools or libraries.
  • Share your experience in internal talks or study groups.

Sharing isn't bragging; it's a signal to the world of "what I care about." That signal pulls in people with the same interest, and opportunities.

Harden Your Thinking Through Writing

Two things happen when you write. First, vague thoughts get organized and your expertise deepens. Second, the writing speaks your color on your behalf. Write consistently on the same theme and people will naturally remember "for that topic, this person."

Start in One Field, Then Expand

Don't try to build a grandiose color from the start. Pick one small area, dig into it to the level of "here I know best," then widen into adjacent areas. Once one depth forms, it becomes the foundation for building another.

A Practical Example: Building Color in 90 Days

Phase 1 (days 1-30): Discovery
  - Log the topics colleagues ask me about
  - Note the work where I lose track of time
  - Narrow to 2-3 candidate areas

Phase 2 (days 31-60): Dig Deep
  - Pick one candidate
  - Write one internal article on that topic
  - Solve one hard related problem all the way through

Phase 3 (days 61-90): Share and Expand
  - Present/share what I learned
  - Widen into one adjacent area
  - Rewrite my "one-sentence intro"

Types of Color: Technology Isn't the Only Color

When we say "color," we often picture "which tech stack you use." But color is far wider than that.

Functional Color vs. Attitudinal Color

  • Functional color: deep expertise in a specific field. "Distributed systems," "data pipelines," "frontend performance."
  • Attitudinal color: the way you approach work. "Someone who sees things through," "someone who makes the complex simple," "someone who writes clear docs."

Interestingly, the color that is remembered longest is often attitudinal rather than functional. Technologies come and go with trends, but the attitudinal reputation that "handing it to this person puts me at ease" follows you even when the field changes.

A Spectrum of Color Examples

Connector   : someone who links people and information
Translator  : someone who interprets between tech and business
Simplifier  : someone who makes the complex clear
Finisher    : someone who sees started work through to the end
Explorer    : someone who tries new technology first
Teacher     : someone who teaches well what they've learned

Think about which of these is most natural for you. Several may blend into a combination that is uniquely yours.

What Blurs Your Color

As much as you grow your color, you should know the patterns that make you lose it.

Endless Catch-Up

If you chase every new technology as it appears, depth never forms. Just as mixing all colors yields gray, touching every field shallowly erases your color. Selection and focus are the premise of color.

The "Yes-Man" Trap

Saying yes to every request makes you "the person who does anything." Convenient, but colorless. Sometimes saying "that's not my strength — X would do it better" protects your color.

The Swamp of Comparison

Constantly comparing yourself to others blurs your color. The thought "that person is good at that and I'm not..." keeps you from seeing your own unique strength. The object of comparison should be not others but yesterday's you.

A Case: An Ordinary Developer Finds Their Color

The story of a developer, K, five years in. He felt he had nothing especially outstanding. No algorithm-contest wins, no flashy open-source contributions. "I'm just an ordinary developer," he thought.

One day a colleague said, "K, there's always something to learn from your PR reviews. You even explain why you did it that way." Only then did K realize he had a natural strength in "explaining code well."

K consciously grew that strength.

  1. He wrote review comments more carefully, with reasons.
  2. He compiled frequent review points into an internal guide document.
  3. He volunteered as an onboarding mentor for new hires.
  4. He gave an internal talk on code-review culture.

A year later, K became the person who came to mind for "code quality and mentoring," and was promoted to senior. His color wasn't newly created; it was an existing one he discovered and grew.

Connecting Color and Career

Your color is not mere self-satisfaction but a real career asset.

A Magnet That Pulls Opportunities

To a person with a vivid color, opportunities matching that color come. With the perception "for reliability, that person," the important reliability project goes to them. Color is a magnet that pulls opportunities even while you stand still.

Power in Job Changes and Negotiation

"A backend developer specialized in the stability of payment systems" is far stronger than "a backend developer." A concrete color makes you memorable in interviews and turns irreplaceability into leverage in salary negotiation.

Recognition in the Community

Color works outside the company too. Write or speak consistently on a specific topic and your name becomes known in that field. This becomes the foundation for new opportunities, collaboration, and career transitions.

Balance and Caution: Color Is Not a Prison

Emphasizing your color comes with traps that are easy to fall into.

Don't Let Color Become a Cage of a Label

The label "expert in X" pulls in opportunities, but it also confines. The perception that "that person only does that" can block new challenges. Color should be the anchor of identity, not the ceiling of growth. While keeping your core color, leave deliberate time to explore beyond it.

Allow Yourself to Change

Color isn't fixed for life. Interests change, markets shift. Rather than clinging to your color from five years ago, you can keep your core value (say, "I make complex things simple") while evolving the area in which you express it.

Choosing the Channel to Express Your Color

The same color reaches different people depending on the channel you express it through. Choosing the channel that fits you matters.

Characteristics by Channel

Internal wiki/docs : reaches colleagues deeply, permanent, searchable
Tech blog          : external recognition, ideal for deep thinking
Internal talks     : trust and recognition at once, ephemeral
Open source        : strong proof of skill, time-intensive
Social/short posts : fast spread, shallow depth
Mentoring/study    : deep trust, strong to a few

If you're introverted, writing (wiki, blog) fits well; if you like teaching, talks or mentoring; if you want to prove it with your hands, open source. You don't have to do every channel. Digging deep into one or two is better.

Consistency Matters More Than Channel

Whatever channel you pick, the key is consistency. A year of one post per week beats one brilliant post. It's the consistency of accumulation, not the flashiness of the channel, that etches the impression.

A Case: Two Branches of Personal Brand

Two people started blogs around the same time.

P chased trending keywords. He posted a short piece on every hot topic with provocative titles. At first the view counts were good. But because the posts were shallow, when a company that wanted to hire him asked deep questions, he couldn't answer. The gap between packaging and substance showed.

Q wrote only about problems he had actually wrestled with. The posts were few, but each carried depth from real experience. The view counts were lower than P's, but readers felt "this person is the real thing." A few years later, one of Q's posts became a frequently cited reference in the industry, and good opportunities came through it.

The difference wasn't talent but direction. P started from showing; Q started from building. Color only hardens through building.

A Regular Routine to Review Your Color

Color isn't found once and done; it must be reviewed and refined periodically.

Quarterly Self-Check

Once every three months, briefly reflect on yourself.

  • Which area did I contribute to most last quarter?
  • What did colleagues rely on me for often?
  • What work did I lose track of time doing?
  • Does it align with the color I want to grow?

This check keeps your color from diverging from your intent. Working busily, it's easy to get swept into work unrelated to your color; a regular review corrects this.

Using an External Mirror

Self-awareness alone makes it hard to see your color accurately. Ask a trusted colleague or mentor. "What kind of person do I come across as?" "What do you think my strength is?" The image reflected in others' eyes often reveals a color you hadn't noticed.

Recording the Evolution of Your Color

Once a year, compare last year's "one-sentence intro" with this year's. Seeing how the core value stays while the area of expression evolves is a good way to confirm your growth.

Color and the Team: Together, Not Alone

Emphasizing your color can drift into individualism. But a truly strong color shines brighter within a team.

The Value of Complementary Colors

A team is strong not when filled with people of identical color but when different colors complement each other. When an "Explorer" and a "Finisher" are together, new attempts get finished. Knowing your color also reveals which gap you can fill on the team.

Someone Who Recognizes Others' Colors

Paradoxically, the more vivid your own color, the better you recognize others'. Only the insecure try to monopolize every area. Someone who can say "this is X's area, better to hand it over" is someone confident in their own color.

Frequently Asked Questions

Q. I'm a new hire who isn't good at anything yet — can I have a color? Of course. A new hire's color starts not from grand expertise but from attitude. "Someone who asks good questions," "someone who documents meticulously," "someone who keeps digging to the end" are all fine colors. Show small attitudes consistently from the start.

Q. My interests change often — does that mean I can't build a color? Even when interests change, there is often a common thread running beneath them. The pattern that runs through several interests (say, "I learn new things quickly and pass them on") may be exactly your meta-color.

Q. Do I have to force myself to do something to build a color? No. A forced color doesn't last. Start from what you already do naturally, what costs you less effort than others. Color isn't squeezed out by effort; it's discovered through observation.

A Practical Checklist

  • Can I introduce myself in one sentence?
  • Do I know the topics colleagues frequently ask me about?
  • Have I found the intersection of my strength, interest, and market demand?
  • Do I have one core area to build depth in?
  • Am I trying to widen into adjacent areas?
  • Am I keeping small promises consistently?
  • Am I building in public appropriately?
  • Is my ratio of building greater than showing?
  • Is my color confining me?

Color Matters More in the Age of AI

The more tools do much of the work automatically, the more, paradoxically, your own color matters.

The Devaluation of Common Ability

When anyone can quickly produce an average output with the help of tools, the value of "just average" drops. Instead, the value rises of what tools can't easily replace — deep context understanding, good questions, judgment, trust between people. These are exactly the realm of color.

Combining Tools with Your Own Color

The tools themselves are given equally to everyone. Differentiation comes from "what, and from what perspective, you make with them." A person with a vivid color produces different results from the same tools. A tool is a lever that amplifies color, not a substitute for it.

Investing in What Doesn't Change

Technology changes fast, but things like "the ability to explain the complex simply," "the attitude of seeing things through," and "a heart that understands people" do not. Investing in these enduring strengths is the way to protect your color in an age of change.

In the end, the more tools advance, the brighter the color of trust and judgment that only a person can give. Rather than fearing change, it's wiser to deepen the unchanging core of who you are.

Closing: Color Is Discovered, Not Invented

Your color isn't an invention you suddenly conjure one day. It is a process of discovery — making the strengths and interests already within you clear through consistent contribution and honest expression.

Don't strain to look different from others. Instead, dig deep into what you genuinely do well and love, and show it consistently. Then at some point, without needing to explain, a word arises in people's minds alongside you. That is your color, and the beginning of being irreplaceable.

That interview question — "describe yourself in one sentence" — no longer makes me hesitate. The sentence doesn't have to be grand. It only has to be real.

References

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