Available for select consulting projectsQ4 2026

Senior Java Backend Engineer · Software Consultant

Backend systems that keep your business moving.

I help product companies design, build, and improve secure Java platforms, scalable APIs, and enterprise integrations—without adding unnecessary complexity.

Discuss your project View case studies
7+ years production experience
<12 hours typical response
Kathmandu · Remote worldwide
Samir Gautam, senior Java backend engineer and software consultant
AVAILABLEKATHMANDU, NP
SPECIALIZATIONJava · Spring Boot · Distributed Systems
Typical architectureProduction ready
Client
Gateway
Services
Data
Experience trusted by teams atBasico ITPods365Grow TechInfo Developers

01 · Expertise

Senior engineering for business-critical systems.

From first architecture decision to production support, I focus on the parts of software that must work every time.

01

Backend engineering

Secure Java and Spring Boot platforms built for reliability, maintainability, and growth.

  • REST & GraphQL APIs
  • Microservices & SaaS
  • Legacy modernization
02

Enterprise integrations

Dependable connections between your product, ERP, CRM, payments, and event systems.

  • NetSuite & HubSpot
  • Kafka & RabbitMQ
  • Payment gateways
03

Architecture & performance

Practical technical leadership for teams facing scale, security, or delivery bottlenecks.

  • System design reviews
  • OWASP security
  • Database optimization
20%

faster batch processing

Spring Batch optimization
30%

faster database queries

PostgreSQL tuning
50k+

users securely served

OAuth2 and JWT
100k+

daily events handled

Kafka pipelines

02 · Selected work

Complex problems. Clear outcomes.

A selection of backend and integration systems designed for scale, security, and long-term ownership.

01Enterprise

High-Throughput Payment Processor

Enterprise Payment Gateway System

A highly secure payment aggregation system built on Spring Boot, integrating Stripe, local wallets, and secure payment pathways with robust OAuth2 security.

Java 17Spring BootPostgreSQLRabbitMQSpring SecurityOAuth2

Key delivery

  • Seamless Stripe and local e-wallet API integration.
  • OAuth2 + JWT transaction token authorization for absolute security.
  • Idempotent endpoints reducing double-charge errors to 0%.
02Integration

Enterprise Data Synchronization Hub

NetSuite & HubSpot CRM Integration Hub

A high-performance Java engine bridging NetSuite ERP stock databases with HubSpot lead automation systems using RESTlets and event queues.

Java 17Spring BootKafkaPostgreSQLNetSuite RESTletsHubSpot SDK

Key delivery

  • Custom NetSuite SuiteScript 2.x RESTlet pipelines.
  • HubSpot CRM Contacts, Leads, and Pipeline deals sync engine.
  • Resilient Kafka queue buffering peak data sync volumes (100k+ transactions/day).
03SaaS

Containerized Multi-Tenant Core

Scalable Microservices SaaS Platform

A containerized SaaS product architecture managed via Spring Cloud, Apache Kafka, and Kubernetes, serving highly responsive client portals.

Java 17Spring BootSpring CloudKafkaPostgreSQLDocker

Key delivery

  • Centralized Spring Cloud Config Server with real-time Git hooks.
  • Dynamic tenant database routing (Database-per-tenant isolation).
  • Kafka-driven asynchronous events ensuring microservice decoupling.

03 · Technology

A pragmatic, production-tested stack.

Tools are selected around your constraints—not trends. The result is software your team can understand, operate, and extend.

Technical toolkit20+ technologies
Java (8/11/17/21)Spring BootSpring Cloud / MicroservicesHibernate / JPANode.jsExpress.jsRESTful APIs & GraphQLgRPC & WebSocketsApache KafkaRabbitMQNetSuite Integration (RESTlets / SuiteScript 2.x)HubSpot API Integration (Webhooks / Custom Apps)API Gateway (Spring Cloud / Kong)OAuth2 & JWT Security ProtocolsStripe & Local Payment GatewaysPostgreSQLMySQLOracle DatabaseRedis (Caching & Pub/Sub)MongoDB

Architecture before tooling. Technology choices are validated against scale, team capability, security, and total cost of ownership.

04 · Experience

Built in production, not just in theory.

Seven years delivering enterprise software across fintech, SaaS, integrations, and digital public services.

2024 - Present
1

Senior Java Developer & Integration Specialist

Basico IT (Spain - Remote)

Architect and lead backend systems development and high-throughput integrations for European clients, focusing on secure financial flows and modernizing Java legacy systems.

Java 17Spring BootPostgreSQLKafkaDocker
2022 - 2024
2

Backend Architect & Software Consultant

Pods365 (Kathmandu, Nepal)

Helped define architecture strategies for SaaS multi-tenant portals, bridging NetSuite ERP solutions and HubSpot marketing automation suites to core backend services.

Java 11Spring BootHubSpot APINetSuite SuiteScriptRedis
2020 - Present
3

Founder & Senior Software Engineer

Grow Tech Pvt. Ltd. (Kathmandu, Nepal)

Founded and scaled Grow Tech, designing secure RESTful APIs, multi-tenant architectures, and payment aggregations for Nepalese enterprise and agricultural SaaS platforms.

Java 8/11Spring BootOAuth2/JWTLDAPDocker
2019 - 2020
4

Software Engineer (Java Backend)

Info Developers Pvt. Ltd. (Kathmandu, Nepal)

Worked on secure government workflow platforms, digital certificate systems, and enterprise banking APIs.

Java 8Spring BootThymeleafOracle DBDigital Signatures
Download full résumé

05 · Services & rates

Flexible ways to work together.

Transparent starting points make it easier to choose the right engagement. Final scope is confirmed after discovery.

01

Java Backend Development

High-performance enterprise architectures built on Java 17/21 and Spring Boot. We build robust, reliable, and secure foundations that can handle millions of requests without breaking.

Starting at$60 / Hour2 - 8 Weeks
  • Custom Spring Boot API and RESTful services
  • Spring Security + OAuth2 / JWT configuration
  • PostgreSQL / MySQL schema design & query optimization
  • Clean, scalable, and highly documented codebase
Get a tailored estimate
Most requested
02

Spring Boot Microservices & SaaS

Transitioning monolithic platforms to containerized microservice architectures. Includes service discovery, API Gateways, dynamic tenant routing, and event messaging.

Starting at$3,500 / Project4 - 12 Weeks
  • Dockerized microservice cluster configuration
  • Event-driven architecture using Kafka or RabbitMQ
  • Database-per-tenant SaaS multi-tenant logic
  • Kubernetes profiles for automatic autoscaling
Get a tailored estimate
03

HubSpot & NetSuite Integrations

Streamlining business data by linking custom software with HubSpot CRM and NetSuite ERP. Build automated workflows, synchronization tunnels, and custom RESTlets.

Starting at$2,000 / Project2 - 6 Weeks
  • Custom NetSuite SuiteScript 2.x RESTlet pipelines
  • HubSpot Custom App, Webhook, and CRM sync engines
  • Error retry logs & background data sync buffers
  • Automated lead and invoice creation flows
Get a tailored estimate
04

Technical Architect Consulting

Technical consulting on system design, database tuning, security audits (OWASP mitigations), and code refactoring to save infrastructure costs and prevent security breaches.

Starting at$75 / HourOn-Demand
  • Detailed architectural design reviews & diagrams
  • Database slow-query analysis and index restructuring
  • OWASP security checks & penetration audit fixes
  • Refactoring strategy for legacy Java software
Get a tailored estimate

How engagements work

01Discovery call
02Scope & architecture
03Build & validate
04Launch & support

06 · Client feedback

Trusted by technical leaders.

“

Samir joined our remote team and instantly elevated our backend standards. He optimized our Spring Batch processing pipeline, improving inventory sync speeds by 20% and resolving database lockouts that had bugged us for months. His understanding of OAuth2 and payment gateways is second to none.

E
Eduardo Rodriguez JusdadoChief Technology Officer · Basico IT (Madrid, Spain)
“

We hired Samir to build the ERP connector bridging our core SaaS portal with HubSpot CRM and NetSuite. His architectural decisions saved us weeks of dev time. The event-driven Kafka setup he implemented runs incredibly smoothly, handling spikes in leads with zero message loss.

A
James SmithChief Technology Officer · Pods365
“

Samir is an exceptional engineer who thrives under pressure. While at Info Developers, he built citizen workflow engines that processed sensitive digital certificates with high security standards. His commitment to OWASP guidelines and clean code architecture was invaluable to our government agency contracts.

D
Ishwor ThapaProject Manager · Info Developers

07 · FAQ

Before we start.

Straight answers to the questions most clients ask before an engagement.

What kinds of projects are the best fit?+

Backend platforms, Java/Spring Boot modernization, SaaS architecture, API integrations, performance work, and technical audits are the strongest fit.

Can you work with an existing engineering team?+

Yes. I can join as a senior individual contributor, lead a defined delivery stream, or provide architecture and review support to your existing team.

Do you work with international clients?+

Yes. I work remotely from Kathmandu with reliable overlap for European, Asian, and selected US working hours.

How quickly can we get started?+

Most consultations can start within a few days. After a short discovery call, I provide a clear scope, delivery plan, and commercial recommendation.

08 · Start a conversation

Let's build something your team can rely on.

Tell me what you are building, where it is blocked, and what success looks like. I'll reply with a practical next step.

Direct Lead Channels

Have a project in mind, an ERP integration challenge, or need technical consulting? Fill out the form or reach out directly.

EMAIL ADDRESSgautamsamir77@gmail.com
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UPWORK PROFILEHire Samir on Upwork
CONSULTING SLA STATUS
Response Time: < 12 Hours | Timezone: GMT+5:45 (Nepal) / Available for EU & US overlapping hours.
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