Jonathan Ooi

Soft Space

Backend architecture, fintech platform modernisation, system integration, and engineering delivery improvement.

• Built a reconciliation engine processing 10M+ transaction records per run, parsing, matching, and reporting in 10 minutes.
• Cut manual reconciliation and settlement from 5 hours to 15 minutes by rolling out automated services.
• Rolled out 20 new backend services to production, modernising legacy bottlenecks into scalable modules.
• Unified 4 separate system portals into one, reducing merchant onboarding time.
• Led and mentored 6 engineers, setting architecture direction across the platform's backend services and concurrent fintech initiatives.
• For well-specified feature work, an AI-assisted, spec-driven workflow turns multi-day tasks into same-day delivery, shifting effort to architecture, review, and testing.

Paywatch

Building the bank integration layer and platform services behind the company's expansion into new countries.

• Built the bank integration layer supporting 3 banks across 3 countries, replacing manual file-upload disbursement with a reusable regional foundation.
• Enabled near-instant disbursement, cutting the wait for withdrawn funds to reach a user's bank from around 4 hours to minutes on withdrawal.
• Cut new-market environment setup from 3 days to 1 hour by automating provisioning with Infrastructure as Code.
• Launched a bill payment integration supporting 50 billers and services, opening a new revenue stream.
• Built a rule engine turning business rules into customisable, visualised configurations across application services.
• Revamped customer portals with the product team and mentored engineers across the systems being built.

Pow Pocket Sdn Bhd

Full-stack product delivery with TypeScript, React, and Next.js across healthcare and e-commerce systems.

• Delivered three production platforms across healthcare, pharmaceutical, and e-commerce within 14 months.
• Built an order management system taking a pharmaceutical company's ordering process online.
• Delivered an online doctor platform for rapid COVID testing.
• Developed a memorial plot management and agent commission distribution system.
• Built automated Cypress test flows validated against 50,000+ records, raising confidence in frontend releases.
• Integrated a healthcare app backend with an e-wallet provider and payment gateway.

EY

Technology consulting across proposal development, delivery leadership, and hands-on engineering for public sector, telco, and retail clients.

• Delivered a government client project and an internal application to production within a 5-month tenure.
• Crafted technology proposals from scratch covering business transformation, change management, product and architecture design, scope, cost, and timeline.
• Led multiple teams and projects, keeping delivery on track against client commitments.
• Contributed hands-on software development to unblock delivery teams, and enforced security, testing, and production-readiness standards.

Carsome

Team delivery, stakeholder management, and technical solutioning aligned with other tech leads and the CTO.

• Led a team of 4 engineers with team delivery, not individual output, as the primary measure.
• Translated business needs into technical solutions with stakeholders.
• Ran task breakdown and delegation, defining scope and definition of done before each sprint.
• Aligned technical direction and delivery with other tech leads and the CTO.
• Protected team wellbeing, shielding engineers from organisational noise.

Carsome

Full-stack development across vehicle bidding, inventory, and internal platform systems.

• Won an internal hackathon with an app for car inventory tracking and location-to-location transfer with handshake and tracking, shipped into daily operations.
• Built a car library covering brands and models worldwide, reused across 5 services platform-wide.
• Reduced manual finance data entry by integrating internal systems into Oracle NetSuite ERP.
• Built the live dashboard for the car bidding platform, showing real-time bid activity.
• Built internal portals and user access control management.

Penpec Group

Full-stack product development reporting directly to the director, turning business ideas into shipped products.

• Initiated and shipped four products to production from scratch: eTender (procurement), Grabies (customer rewards), pharmacyKu (online pharmacy), eRider (on-demand delivery).
• Owned website and mobile application development across the group's product portfolio.
• Translated the director's business ideas into product designs and technical solutions.
• Ran penetration testing across group applications.

Penpec Group

On-premise IT infrastructure and internal tooling for the group.

• Built an internal employee portal (ePortal) from scratch: claims, leave, contacts, announcements, and SAP B1 reports accessible remotely, cutting manual administrative work by 60%.
• Maintained on-premise infrastructure: SAP B1 and UBS servers, Active Directory, firewalls, load balancer, backups, PABX, CCTV.
• Customised SAP B1 reports with Crystal Reports and UBS reports for management.

EQX Asia Sdn Bhd

On-premise server and network support, and the start of the move from hardware into software development.

• Set up a new office server room, door access, and alarm systems single-handedly, avoiding the cost of an external vendor.
• Rolled out an attendance system across 3 country offices, synced back to HQ.
• Built a warehouse inventory tracking system with PHP, MySQL, HTML, and CSS.
• Maintained and troubleshot on-premise servers and network infrastructure, and picked up development from senior engineers.

Impact: Improved maintainability, reduced operational dependency, and created a cleaner foundation for future expansion.

Go · Node.js · PostgreSQL · AWS · Docker

Impact: Replaced manual disbursement with near-instant withdrawals, cutting user wait from around 4 hours to minutes, and new-market setup from 3 days to 1 hour.

Java · Go · REST API · SQL · Bank APIs · Terraform / IaC

Impact: Processes 10M+ transaction records per run in 10 minutes, cutting manual reconciliation and settlement from 5 hours to 15 minutes.

Go · AWS Lambda · S3 · DynamoDB · DuckDB · Parquet

Impact: Turns well-specified multi-day tasks into same-day delivery, with output staying consistent with team standards across projects.

Spec-driven Development · OKF · RAG · AI Skills · MCP · Context Management