Senior / Lead Software Engineer
I help startups go from 0 to 1, turning an idea into a production-ready product. 10+ years and 40+ projects across SaaS, POS, inventory, and e-commerce, now used by 100+ businesses.
Lead Software Engineer
Resonian Inc. · United StatesI work as a senior engineer on difficult product and engineering problems. Most of that work is SaaS, point of sale, inventory, and e-commerce: multi-tenant systems, large data sets, offline-first behavior, and the architecture and deployment around them.
If you have a product or team initiative in mind, reach out via the contact section. I respond as soon as I can.
Designing clear boundaries, data models and application structures that remain maintainable as teams, data and traffic grow.
Balancing engineering quality with UX, business requirements and practical delivery.
Code reviews, architecture decisions, standards and hands-on mentoring that help teams ship reliably.
Engineering work across SaaS, product teams, and commercial freelance—focused on what each role actually involved.
Production engineering skills, grouped by discipline. AI is a current area of development.
Currently exploring these alongside production software engineering.
Product engineering for business software, from new platforms to existing applications.
Scalable web applications, internal tools, dashboards, workflows, and business platforms designed around real-world operational requirements.
Point-of-sale and inventory platforms with sales management, reporting, multi-store workflows, synchronization, and offline-first capabilities where appropriate.
Modern e-commerce applications with product management, customer workflows, orders, payments, and scalable administration.
Production-grade frontend and full-stack applications using React, Next.js, TypeScript, and modern data-management patterns.
Architecture improvements, performance optimization, refactoring, bug fixing, maintainability improvements, and modernization of existing applications.
Integrating Large Language Models, AI agents, Retrieval-Augmented Generation, tool calling, and intelligent automation into new and existing products.
Selected products, with the role, technologies, and capabilities already documented for each.
Supershop Management ERP
Shah has been a great asset in the delivery of our solution. His logical reasoning and planning meant that there has been minimal rework of the desired outcome, and his ability to deliver the front end design and back end logic and data has resulted smooth and quick delivery.
Shah Ali is a very talented full stack developer, I was his first client back in 2019 and he delivered exceptional results building the first iteration of our product. I would highly recommend working with Shah Ali!
shahalihridoy completed the gig, it took a bit longer than expected, but he did not give up and was able to tackle the revisions as they were requested and deliver the final outcome as desired. Communication was good throughout the process.
Shah Ali is very competent at what he does. I can't recommend him more. He is great at communicating exactly what he's working on and gets the job done the right way. He makes sure his work functions correctly and is always there to support even after delivery.
I’m a software engineer, and I wanted some help with some front end work for a project. He worked extremely fast and has an excellent grasp on React and other web technologies. He’s awesome! Definitely consider hiring him!
The seller was great as always! Truly recommend this seller for everyone how are looking for a talented react & firebase developer!
Fantastic person and developer. He will answer any questions you have and complete your work fully!
We hired Md Shah to develop our web app and database for one of our main products. He was very responsible and collaborative at every moment. Md Shah has much technical knowledge and his advice was very appropriate. His job was of high quality and with all guarantees.
Very Awesome. Definitely will buy his services again. He was able to solve the problems quickly and be able to find the new solutions faster.
Great service and communication! I was incredibly impressed with his skill level and knowledge. He helped me from the small idea of the website I had in mind all the way to deployment. Will definitely be working with him again.
I truly appreciate his work, it is high quality and very fast. I will keep going to him for work just very professional.
Fantastic. Fixed a problem I had with my autocomplete search. This was the last major bug I had that was keeping me from launching my website. Thanks so much!
Whether you need a senior engineer to join your team, help modernize an existing application, or build a new product from the ground up, I'd be happy to discuss your requirements.
ProfilesPrefer email? I typically reply within one business day.