Mark W.
FreelancerTop Rated PlusAPI Technical Writer: Open banking | Payments Processing | Trading
Member since 2020 · 100% Job Success
View on Upwork
WorldTop 0.19%
United StatesTop 0.61%
API DocumentationTop 0.47%
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$8.3k
MRR
est. monthly
#1,982
World rank
of 1,051,138
$267k
Lifetime earnings
since 2020
15
Total jobs
completed
About
I am an API Documentation Specialist for FinTech, including payment processors and investment management. As an Expert-Vetted freelancer on Upwork, I rank in the top 1% of technical writers. I’ve appeared on podcasts like Knowledge Base Ninjas (see video in profile) and collaborate with industry leaders like Scott Abel to train tech writers.
I help companies transform their API documentation into the definitive "single source of truth" while translating complex API workflows into clear, actionable user guides that bridge the gap between business processes and technical execution.
What I Offer:
- FinTech Expertise: In-depth knowledge of payment processors and investment management.
- API Docs Beyond Swagger: Expert in charting API flows and documenting sequences that mirror business processes.
- AI-Equipped Documentation: Ensuring content is semantically rich and queryable for advanced retrieval needs like knowledge graphs.
- OpenAPI Design & Testing: Extensive experience in API design, testing, and documentation that aligns with modern development practices.
- Proven Training Success: Developed and delivered a profitable API documentation course, grossing over $20k independently, covering both technical and instructional content.
Deliverables I Can Provide or Create for You:
- Comprehensive user guides and product manuals
- Detailed API documentation
- Clear SDK documentation
- Developer guides and tutorials
- Training material on technical topics
- Informative knowledge base articles
- Well-structured style guides
My API documentation process includes:
- Analyzing the OpenAPI spec and existing guides to understand the API's business domain.
- Diagramming domain models to capture key entities and relationships.
- Testing the API in a sandbox environment to ensure accuracy.
- Exploring API flows and user journeys (e.g., UI interactions where applicable).
- Revamping API references by thoroughly testing examples and addressing deviations.
Tools and Technologies I Excel In:
- Programming frameworks: Node.js, React, PostgreSQL, SQL, and Python basics
Rankings
Where Mark W. ranks by monthly revenue, worldwide, in United States, and in every Upwork skill it competes in.
World#1,982 / 1,051,138Top 0.19%
United States#837 / 137,007Top 0.61%API Documentation#2 / 422Top 0.47%
FinTech#8 / 1,018Top 0.79%
Payment Processing#2 / 717Top 0.28%
Markdown#2 / 205Top 0.98%
Financial Trading#2 / 483Top 0.41%
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Freelancer snapshot
On Upwork since2020
Rating100% Job Success
Skills tracked5
Skills
API DocumentationFinTechPayment ProcessingMarkdown
Mark W. works mainly in API Documentation, ranking top 0.47% of freelancers in that skill.
MRR trendSoon
Last 12 weeks
Coming soon
Competitors on the board
Who ranks just above and below by MRR across all freelancers.
This freelancer is #1,982 of 1,051,138 across all freelancers.
RankFreelancerMRRMRR trend
MRR benchmark
Mark W. earns more than 99.81% of all freelancers we track.
Top 0.19%
among all freelancers we track
$0–$500
32%
$500–$1k
12%
$1k–$2.5k
17%
$2.5k–$5k
13%
$5k–$10k
12%
$10k–$25k
10%
$25k–$50k
3%
$50k+
1%
Mark W.'s bracket · $8.3k
You32%$0–$500
You12%$500–$1k
You17%$1k–$2.5k
You13%$2.5k–$5k
You12%$5k–$10k
You10%$10k–$25k
You3%$25k–$50k
You1%$50k+
Mark W. earns an estimated $8.3k/mo. That's 5.7× the typical freelancer and more than 99.81% of everyone we track.
Freelancers with no recent MRR are excluded. Only the 151,011 freelancers with active monthly revenue are ranked here.
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MRR is an estimate from Upwork's public figures - not an Upwork-official number.