Kristina A.
API Development SME Engineer - Custom Builds & System Integrations
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#17 in SEO XML Sitemap Experts#21 in Amazon MWS Developers#36 in WordPress Plugin Developers#54 in Offshore PHP Developers#69 in Xero Developers#85 in AJAX Developers#93 in Application Integration Specialists#100 in jQuery Developers#107 in SQL Developers#152 in Laravel Developers#156 in MySQL Developers#159 in HTML Developers#236 in Senior Software Engineers#294 in Seaborn Developers#419 in JavaScript ES6 Developers
Total earned
$210K
lifetime, as published
Jobs
132
contracts to date
Hours
n/a
not published
Client rating
4.6 / 5
86 reviews · JSS 91%
Hourly rate
$85/hr
profile rate
Index Score
73
#20802 overall
Insights
How these are computed- Run-rate, measured
- $38.2K/yr
- Earnings growth between Dec 18, 2025 and Nov 12, 2026 (329 days), annualised. ≈ $3.2K/month.
- Lifetime pace
- n/a
- Lifetime earnings divided by years on Upwork. A floor on historical pace, not a forecast.
- Earnings per job
- $1.6K
- Average contract value to date.
- Realised hourly
- n/a
- Total earned over billed hours. Fixed-price work inflates it; compare with the profile rate.
Index Score breakdown73.2/100
Scale 39.9/45Quality 22.8/25Trust 0/15Momentum 10.5/15
Observation history
Every read of the public profile. Last observed Nov 12, 2026.
| Observed | Earned | Δ | Jobs | JSS |
|---|---|---|---|---|
| Nov 12, 2026 | $210K | No change | 132 | Not rated |
| Nov 11, 2026 | $210K | +$34.4K | 132 | Not rated |
| Dec 18, 2025 | $176K | +$8.3K | 112 | 91% |
| Apr 17, 2025 | $168K | 95 | 72% |
About
US-Based Principal Engineer | Zero Outsourcing | 25+ Years in the Trenches I provide the technical certainty that only comes from longevity. With over 100 projects completed on Upwork and experience dating back to the earliest days of the web, I build robust backend architecture that works the first time. I Make Systems Talk to Each Other — HubSpot, Jobber, WooCommerce, Mailchimp, Salesforce, FieldAware, Workyard, and more. If your CRM, website, or field-service tools aren't syncing the way they should, that's exactly the problem I solve. Recent Work: • HubSpot & Jobber Sync — a custom Python listener and PHP-based integration automating real-time client sync (Create/Update) and job lifecycle automation via high-performance webhooks, built when Zapier and native integrations weren't cutting it. • Custom WordPress Booking Plugin — full Jobber GraphQL API integration for a service-industry client, including a self-service cancel/reschedule flow, taken from early development through staging acceptance. • Field Service Software Integration — built in Airtable with TypeScript automations, connecting two different field-service management platforms (FieldAware and Workyard) so job and crew data flow between them automatically • Large-Scale Data Pipeline — a Python/PHP deduplication and normalization pipeline for a veteran employment nonprofit, processing 113 files and roughly 79,600 records. • Commercial Product Development — authored and released a WooCommerce/Authorize.net payment gateway plugin (CIM vaulting, auth-only checkout with manual capture, subscription billing, debug logging) with LemonSqueezy license management, plus a Python Gmail API bulk mailer tool. Core Expertise: • Python & FastAPI — modern, asynchronous, strictly typed APIs • API Integration & ETL — REST, GraphQL, and legacy SOAP services • PHP & Backend Systems — custom architecture, Laravel, and database optimization • Data Architecture — custom SQL design and complex JSON transformations Why Work With Me: You are hiring a Subject Matter Expert, not a junior developer. I do not outsource, I do not subcontract, and I do not require hand-holding. I translate business requirements into production-ready code that is documented and resilient.Read more
Skills
PHPJavaScriptPythonAJAXSQLLaravelAPIjQueryMySQLAPI DocumentationHTMLAmazon MWSJSONWordPress PluginXML
Profile facts
- Member since
- n/a
- Last contract
- not published
- Availability
- Not published
- Earnings shown as
- exact figure
- Languages
- Not published
- Listed under
- Amazon MWS Developers, Senior Software Engineers, JavaScript ES6 Developers, Seaborn Developers, AJAX Developers, SQL Developers, Laravel Developers, Application Integration Specialists, jQuery Developers, MySQL Developers, API Documentation Writers, HTML Developers, Json-LD Developers, SEO XML Sitemap Experts, Twitter API Developers, Xero Developers, WordPress Plugin Developers, XML Developers, QuickFIX Specialists, Offshore PHP Developers
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