/crest

Topic DNA

Purpose

"What are you known for?" is the brand question every engineer eventually faces. Topic DNA — the intersection of Tech × Domain × Perspective — answers it. A defined Topic DNA gives every profile, post, talk, and interview a unifying axis. Without one, the engineer is forgettable in a crowded market.

Scope Boundary

• IN scope: positioning statement authoring, Tech × Domain × Perspective triangulation, content-pillar derivation, defensibility audit, durability check, audience-fit verification.
• OUT of scope: SNS publishing strategy (sns), content calendar / amplification (blog), profile copy on a specific platform (github / linkedin / bio), portfolio architecture (portfolio), full-funnel marketing (delegate to growth / funnel).

Core Concepts

The Triangulation

A defensible niche sits at the intersection of three axes:

A pure-Tech identity ("Rust engineer") is replaceable. A pure-Domain identity ("fintech engineer") is generic. A pure-Perspective identity ("performance obsessive") is too vague. The Tech × Domain × Perspective intersection is where credibility compounds.

Examples of Crisp Topic DNA

Crisp Topic DNA is identifiable in one sentence and survives a 5-second elevator pitch.

Defensibility Audit

A Topic DNA must be:

If all six pass, the Topic DNA is shipping-ready.

Durability vs Trend

Avoid Topic DNA tied to single technologies that age fast:

Tech component should be a class of problem, not a hype tool.

Content Pillars from Topic DNA

Once Topic DNA is set, content automatically derives:

Aim for 3–5 pillars. Each pillar generates years of articles, talks, and projects.

The 80/20 Rule

LinkedIn's 360Brew Topic DNA model recommends:

• 80% of content within Topic DNA pillars (depth signal).
• 20% outside the pillars (breadth signal — keeps you human).

Below 80% on-pillar dilutes positioning. Above 95% becomes one-note.

Audience Fit

Topic DNA must intersect a real audience:

Smaller niches monetize per-client at higher rates; larger niches at scale via products. Pick based on monetization preference.

Common Failure Modes

Triangulation Worksheet

A practical exercise:

1. List 5 technologies you've shipped non-trivial work in (last 24 months).
2. List 3 domains you've worked in or have credible interest in.
3. List 5 perspectives that describe how you approach problems differently.
4. Form 5 candidate triangulations: Tech[i] × Domain[j] × Perspective[k].
5. Run defensibility audit on each.
6. Pick top 1–2 and write the one-sentence positioning.

Two-Tier Strategy

Some engineers maintain:

• Primary Topic DNA — used in headline, About, conference bios.
• Secondary Topic DNA — used for side-projects, experiments, hobby.

Two-tier is fine if both are clearly demarcated. The risk is signal dilution if both appear at primary positions.

Evolution Cadence

Topic DNA should evolve every 18–36 months, not quarterly. Stability builds credibility; constant rebranding signals confusion.

Workflow

1. List 5 tech axes / 3 domains / 5 perspectives from real shipped work.
2. Form 5 candidate triangulations.
3. Draft a one-sentence positioning per candidate.
4. Run defensibility audit — 6 checks (specific / defensible / demonstrable / audible / durable / genuine).
5. Audience-fit check — niche size estimate.
6. Derive 3–5 content pillars from the chosen Topic DNA.
7. Apply 80/20 ratio plan for content allocation.
8. Document Topic DNA in a single canonical artifact (used to seed bio, profile, talks).
9. Set evolution review for 18–36 months out.
10. Hand off to bio for platform variants, portfolio for site IA, blog / sns / conference for content amplification.

Output Template

topic_dna:
  primary:
    one_sentence: "Postgres performance specialist for fintech systems with a compliance-first lens."
    tech: postgres
    domain: fintech
    perspective: compliance_first
    defensibility:
      specific: PASS
      defensible: PASS    # ~50 globally
      demonstrable: PASS  # 3 OSS contributions, 4 articles, 2 talks
      audible: PASS       # peers describe me with these terms
      durable: PASS       # 3-year horizon
      genuine: PASS       # genuinely interested
    audience_estimate:
      size_band: 5000_to_15000
    content_pillars:
      - id: P1
        name: "index design and bloat management"
        share_pct: 25
      - id: P2
        name: "query plan diagnostics under load"
        share_pct: 25
      - id: P3
        name: "replication, HA, and audit logging"
        share_pct: 20
      - id: P4
        name: "compliance, regulatory query patterns (PCI/SOX/MAS)"
        share_pct: 20
      - id: P5
        name: "off-pillar (cooking, climbing, side bets)"
        share_pct: 10
    on_pillar_target_pct: 80
    review_due: 2027-10-01
  secondary:
    enabled: no
  handoff:
    bio: derive_platform_variants
    portfolio: site_ia
    blog: pillar_calendar
    sns: zero_click_publishing

Anti-Patterns

• Buzzword soup — combining 4+ technologies in the headline.
• Trend-bound Tech axis — dies with the trend.
• Pure resume framing — past, not present.
• Vague Perspective ("quality-focused", "team player").
• Topic DNA that doesn't match what you actually do daily.
• Aspirational DNA before any artifacts back it up.
• Quarterly rebranding — no compounding.
• Two-tier with unclear demarcation — confuses everyone.
• Niche under 1,000 globally without high fee-per-client model.
• Niche over 100,000 with no differentiation — invisible.
• Topic DNA derived from competitor envy rather than genuine interest.
• Topic DNA that requires explanation longer than one sentence.
• Pillars overlapping — same content categorized two ways.
• Pillars below 3 (too narrow) or above 5 (too scattered).
• 100% on-pillar content — robotic, no humanity signal.
• Below 70% on-pillar — positioning collapses.

Deliverable Contract

A Topic DNA package is complete when:

• One-sentence positioning written.
• Tech / Domain / Perspective named explicitly.
• Defensibility audit passes 6/6 checks.
• Audience size band estimated.
• 3–5 content pillars derived with share % summing to 100.
• 80/20 on-pillar policy stated.
• Review date set 18–36 months out.
• Handoff briefs prepared for bio, portfolio, blog, sns, conference.

References

• Marty Neumeier, Zag (2007) — radical differentiation framework.
• Al Ries & Jack Trout, Positioning (1981) — original positioning theory.
• April Dunford, Obviously Awesome (2019) — positioning for technical products (transferable to engineers).
• Patrick McKenzie, Don't Call Yourself a Programmer — engineer self-marketing primer.
• David Heinemeier Hansson, Rework / REMOTE — opinionated engineer brand examples.
• LinkedIn 360Brew — Topic DNA model for the platform.
• Jason Fried, It Doesn't Have to Be Crazy at Work — durable, calm brand voice.
• Cal Newport, So Good They Can't Ignore You (2012) — career-capital framing.
• Daniel Pink, Drive — autonomy-mastery-purpose alignment with brand work.
• Seth Godin, This Is Marketing (2018) — niche-first audience strategy.
• Justin Welsh, The Diversified Solopreneur — one-niche solo creator model.
• Andy Crestodina, Orbit Media — content-pillar methodology.