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You will get automate workflows between your CRM, marketing, and internal tools
Top Rated
Project details
Manual data transfers and disconnected systems are silent killers of productivity and budget. My Inter-System Workflow Automation service eliminates these inefficiencies, leveraging deep expertise in Structural Integrity to build robust, scalable, and low-maintenance connections between your critical business applications.
I specialize in transforming fragmented operational processes into seamless, automated workflows. This isn't just about scripting; it's about designing an event-driven architecture that ensures data consistency, reduces human error, and frees your team from repetitive tasks. By implementing the Observer/Pub-Sub pattern, I establish a decoupled system where changes in one application reliably trigger updates in another. This approach inherently lowers long-term maintenance costs by creating resilient, self-healing connections that prevent brittle dependencies.
My process begins with a meticulous analysis of your manual touchpoints. Implementation focuses on clean code that is easy to understand and maintain. I prioritize solutions that integrate smoothly into your existing ecosystem, ensuring high adoption and immediate ROI.
I specialize in transforming fragmented operational processes into seamless, automated workflows. This isn't just about scripting; it's about designing an event-driven architecture that ensures data consistency, reduces human error, and frees your team from repetitive tasks. By implementing the Observer/Pub-Sub pattern, I establish a decoupled system where changes in one application reliably trigger updates in another. This approach inherently lowers long-term maintenance costs by creating resilient, self-healing connections that prevent brittle dependencies.
My process begins with a meticulous analysis of your manual touchpoints. Implementation focuses on clean code that is easy to understand and maintain. I prioritize solutions that integrate smoothly into your existing ecosystem, ensuring high adoption and immediate ROI.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$500
|
Standard
$700
|
Advanced
$1,200
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 7 days |
Number of Revisions | 1 | 3 | 3 |
Number of Sources Mined/Scraped | 0 | ||
Install Script | - | - | - |
Test Script | - | - | - |
Task Automation | - | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$100Frequently asked questions
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GB
Goran B.
Oct 7, 2025
UpWork API Key Specialist
AO
Alex O.
Jun 23, 2025
Bubble Developer for Hotel Booking Flow (using booking API)
David helped integrate a complex API into our Bubble platform and he was fantastic to work with. Always quick to respond, he went above and beyond to build custom code solutions that really fit our needs. Super reliable, knowledgeable, and easy to communicate with - we really enjoyed working with him and would definitely recommend him for any API or Bubble-related work.
PC
Piers C.
Jun 16, 2025
Bubble.io / Python - Need to send data to a python script and return the result to bubble
Great work
EC
EL Mahdi C.
May 13, 2025
Automate Q&As Flashcards
Great as always
SW
Swetlana W.
Apr 28, 2025
Fix push notification in firebase.
I have been working with David for a long time. Every task has been implemented superbly so far. I can recommend him!
About David
API Integration Specialist | System Architect | Backend Developer
100%
Job Success
London, United Kingdom - 12:51 am local time
I've solved this exact problem inside Mastercard and Vodafone — I know what breaks at scale before it breaks.
✮ #1-Ranked API Integration Specialist in the UK
✮ Expert-Vetted — Top 1% on Upwork
✮ Worked with Mastercard & Vodafone
✮ 10+ years solving enterprise-grade backend problems
✮ Architected APIs handling 100,000+ requests/second
✮ 100% customer satisfaction guarantee
Prior to freelancing I solved the hardest integration problems inside two of the world's most demanding enterprises real-time payment sync, event-driven pipelines, and third-party API orchestration under enterprise SLAs at Mastercard and Vodafone. Having architected systems supporting 1M+ daily active users and protected $2M+ in revenue through reliable API design, I can guarantee I will add measurable value to your backend. If I can't deliver, I won't charge for my time — and nobody works for free.
[ What I Build For You ]
✮ RESTful & GraphQL API Design & Architecture
✮ Payment Processor Integrations
✮ Real-Time Data Pipelines & Kafka Systems
✮ Third-Party API Orchestration & Webhooks
✮ PostgreSQL Optimisation & Query Tuning
✮ AWS Infrastructure — Lambda, API Gateway, RDS, SQS
✮ Zero-Downtime Deployments & CI/CD Pipelines
✮ SOC2 & GDPR-Compliant API Security
✮ OAuth, JWT & IAM Implementation
✮ Docker & Container Architecture
✮ API Design Reviews & Technical Leadership
✮ Engineering Team Mentorship & On-Call Rotation Setup
[ Database Expertise ]
✮ PostgreSQL — optimisation, scaling, replication
✮ Amazon RDS & Aurora
✮ Amazon DynamoDB
✮ Redis & ElastiCache
[ Infrastructure & DevOps ]
✮ AWS — Lambda, API Gateway, SQS, RDS, ECS
✮ Docker & Kubernetes
✮ CI/CD Pipeline Design
✮ Zero-Downtime Deployment Architecture
✮ Load Balancing & Rate Limiting
✮ Monitoring & Incident Runbooks
[ Proven Numbers ]
✮ 25x latency improvement — 5s → 200ms on production APIs
✮ 100,000 requests/second throughput architected
✮ $600K/year saved through query optimisation
✮ 99.99% uptime SLA delivered
✮ 1M+ daily active users supported
✮ 40% reduction in engineering incident response time
✮ $2M+ in revenue protected through reliable API uptime
[ My Domain Experience ]
✮ Payment & Fintech API Integration
✮ Real-Time Event-Driven Systems
✮ SaaS Backend Architecture
✮ Enterprise API Transformation
✮ High-Traffic Consumer Platforms
✮ API Security & Compliance (SOC2, GDPR)
✮ Engineering Team Leadership & Mentoring
I love what I do — working with founders and CTOs across industries has given me the opportunity to solve genuinely hard problems at scale. My approach goes beyond the task in front of me. I focus on building the right foundation the first time, and a long-term relationship built on results.
Drop me a message — I'll reply with a personalised Loom walking through exactly what I'd do with your specific situation.
My 6 Promises:
💎 Data-driven API decisions backed by impact metrics
💎 Production-ready delivery with 99.99% uptime mindset
💎 Proactive mentoring and knowledge transfer to your team
💎 Full ownership with formal on-call API support
💎 Professional, efficient execution under pressure
💎 Partnership approach focused on long-term scaling
Steps for completing your project
After purchasing the project, send requirements so David can start the project.
Delivery time starts when David receives requirements from you.
David works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery & Mapping
Analyze existing workflows, system APIs, and identify integration points.
Architecture & Design
Propose a tailored automation architecture and data flow strategy.