Ajay

Lead Backend Developer

SegWitz Sdn Bhd

Jan 2022 - Present • 4 yrs 10 mos

Leadership & Standards * Lead project teams of up to 6 developers while building the backend end to end: plan sprints, break down and assign work, unblock developers and get delivery done; interviewed candidates and helped hire multiple backend developers, and mentored the team. * Backend guidance across the company's projects: review other backend developers' projects, code and feature approaches, and finalize the technical direction before implementation, with final sign-off on project architecture, database design and feature approaches. * Engineering standards: created SOPs and backend architecture and coding standards, and introduced SonarQube quality checks. This reduced issues found at launch time and raised codebase quality across projects. * Involved in every SDLC phase: requirement analysis, turning SRS into API contracts, data models and delivery plans, design, development, testing, release with DevOps and post-release support; join client discussions to explain specs when the non-technical project manager needs support. Engineering Highlights * Architecture decisions on led products: chose a monolith (one deployable, shared database, simpler transactions and operations) where fast delivery mattered, and separate services where parts of a product needed to scale or deploy independently e.g. AdIgnis, Pineapple eCommerce and food-ordering app. * Queue-first async processing: decoupled LLM calls, bill parsing, reports, emails and webhook workflows from synchronous request handling using Redis and BullMQ, with retries, backoff and idempotent handlers to improve resilience to transient third-party failures; plus cron-scheduled jobs. * Payment reliability across 7 gateways (Stripe, Razorpay, Xendit, SenangPay, iPay, MobyPay, Atome): implemented idempotent payment-webhook handling to safely process retries and duplicate callbacks, preventing duplicate order-state transitions and fulfilment while supporting ~5K+ transactions per month across client produc

Programmer

Haryana

Mar 2019 - Dec 2021 • 2 yrs 9 mos

* Built a live vote-counting portal (used in production in a by-election) and an online candidate nomination portal, both handed over to the National Informatics Centre (NIC). * Built REST APIs with Node.js, Express.js, Sequelize and MySQL, and web applications in CodeIgniter and PHP, handling multiple projects in parallel.

PHP Developer

CQLsys Technologies

Jan 2017 - Mar 2019 • 2 yrs 2 mos

* Panels and web applications in Core PHP (OOP) with MySQL, including Google Maps API features. * Designed database schemas, APIs, and admin panels for mobile-app backends using CakePHP and MySQL; built REST APIs in Node.js (Express.js, Sequelize). * Integrated PayPal, Stripe, Braintree, and SquareUp payments, Mailgun and Postmark email, and Twilio SMS.