Can you build custom admin consoles for internal operations teams?

Yes. I specialize in building high-density, real-time admin consoles that give operations, support, and finance teams full visibility and manual control when needed.

Which cloud providers do you deploy SaaS applications on?

I deploy on Vercel, AWS, Google Cloud Platform (GCP), or containerized Docker droplets on Hostinger/DigitalOcean, configured with Redis caching and automated backup schedules.

Home IndustriesSaaS

Multi-Tenant Architecture · Real-Time WebSockets · High Concurrency

SaaS Solutions.

Q: How do you prevent double-charging or race conditions in transaction ledgers?

I use PostgreSQL ACID transactions with pessimistic row-level locking (`SELECT FOR UPDATE`) and idempotency keys, guaranteeing that duplicate webhooks or concurrent requests can never result in multiple ledger entries.

Building resilient SaaS backends, subscription billing systems, real-time operations dashboards, and ACID transaction ledgers.

Consult on SaaS View Case Studies

Sumer Kumar

Full-Stack SaaS Engineer

Remote Worldwide · USA · UK · UAE · India

SaaS platforms require flawless architecture from day one. Unhandled race conditions, slow database queries, or brittle billing logic can derail user growth. I build scalable Next.js and Node.js SaaS systems with strict PostgreSQL transaction boundaries, real-time WebSocket pipelines, and automated subscription lifecycles.

< 120ms

Stream Latency

Instant

Settlement Speed

99.8%

Fraud Shield

Planning a SaaS platform or ERP migration?Discuss Technical Requirements

Strategic Focus & Challenges Solved

SaaS Application Engineering

From high-concurrency event streaming and automated settlement engines to multi-tenant databases, I build production SaaS platforms that remain rock-solid under heavy traffic surges.

Engineered real-time operations console managing concurrent live scoring feeds and automated user rewards.

Implemented double-entry bookkeeping ledger eliminating race conditions during peak settlement periods.

Built automated fraud detection rules and suspicious transaction lockouts with 99.8% precision.

Integrated multi-tier subscription billing with Stripe, automated invoice receipts, and webhook listeners.

Core Capabilities in SaaS

Tailored system modules, data pipelines & operational interfaces

Modern SaaS Frontends & Dashboards

Sub-second responsive dashboards with real-time chart feeds, advanced data tables, and sleek micro-interactions.

Next.jsReact.jsTypeScriptTailwind CSSFramer MotionChart.js / Recharts

High-Throughput APIs & Microservices

Node.js and Express services engineered for concurrency, low latency, and graceful error recovery.

Node.jsExpress.jsRESTful APIsWebSocketsWorker QueuesRedis

Relational Database Architecture & Ledgers

PostgreSQL schemas designed for ACID compliance, row-level locking, and zero data corruption.

PostgreSQLPrisma / TypeORMDatabase MigrationsRow-Level LocksIndexing

Payments, Subscriptions & Auth

Stripe Billing, usage-based metering, customer portals, multi-factor auth, and team RBAC permissions.

Stripe BillingWebhooksNextAuth / JWTOAuth 2.0Role-Based Access (RBAC)

SaaS Project Execution

Five-step engineering framework from workflow mapping to zero-downtime rollout

Data Flow & Domain Modeling

Define entity relationships, tenancy models (single vs. multi-tenant), state machines, and concurrency limits.

01/05

API Contracts & Database Schemas

Design normalized SQL tables with strict foreign keys, atomic ledger tables, and typed API endpoints.

02/05

Core SaaS App & Dashboard Build

Develop frontend views, real-time WebSocket feeds, auth guards, and team management consoles.

03/05

Billing, Webhooks & Fraud Rules

Integrate payment gateways, automated recurring subscription webhooks, and automated risk detection flags.

04/05

Stress Testing & Cloud Launch

Execute concurrent load simulations, optimize database query plans, and deploy on scalable cloud infrastructure.

05/05

Featured Case Studies

Production systems currently in active commercial operation

Sports & Entertainment Gaming Platform

Match Operations & High-Throughput Console

< 120ms Latency

Engineered a resilient operations control panel with sub-second real-time event feeds, automated transaction reconciliation, and automated fraud rule flags.

Node.jsPostgreSQLWebSocketsTailwind CSSGCP

View Case Study

Explore Other Industries

Discover technical solutions across our other core industry specializations

SaaS Software FAQs

I use PostgreSQL ACID transactions with pessimistic row-level locking (`SELECT FOR UPDATE`) and idempotency keys, guaranteeing that duplicate webhooks or concurrent requests can never result in multiple ledger entries.

Ready to engineer your SaaS platform?

Let's evaluate your workflows, schemas, and automation opportunities.

Contact Me All Industries