Backend Developer – Web Applications

Position Title: Backend Developer – Web Applications

Company: Loch Corporate Services Private Limited

Location: Gurugram, Haryana, India

Work Mode: Work from Office

Job Type: Full‑time (Employment or Contract – to be finalized at offer stage)

Reporting To: Director

Compensation: Commensurate with experience

About the Company

Loch Corporate Services Private Limited is a professional services firm delivering a broad range of solutions across management, cybersecurity, and other specialised areas. Built on a foundation of quality and compliance, Loch supports organisations seeking integrated support functions under a single, trusted provider. The firm maintains strict confidentiality standards, consistent quality controls, and seamless collaboration with client teams across multiple sectors.

Loch's technology arm is actively building a growing portfolio of proprietary products and client-facing platforms across multiple industries — including AI-powered document processing systems, augmented reality applications, CRM platforms, client onboarding portals, e-commerce platforms, and internal operational tools. The Backend Developer will play a central role in designing and delivering the server-side systems that power these products.

Purpose of the Role

Design, build, and maintain the backend services and APIs that underpin Loch's growing product portfolio. This is a hands-on engineering role requiring the ability to work independently across multiple concurrent projects — from intelligent document processing systems and AR-powered e-commerce platforms to CRMs and internal operations tools. The Backend Developer will own server-side architecture decisions, ensure systems are secure, scalable, and maintainable, and work closely with frontend developers, cloud engineers, and stakeholders to deliver production-grade solutions.

Responsibilities and Duties

API Design & Backend Development

• Design, develop, and maintain scalable RESTful and GraphQL APIs for web applications, client portals, and internal tools
• Build backend services for diverse product types including AI-powered document processing systems, AR platform backends, CRM engines, e-commerce platforms, and operational dashboards
• Implement business logic, workflow automation, and data processing pipelines based on documented requirements
• Integrate third-party APIs, SaaS platforms, payment gateways (Razorpay, Stripe), e-signature services (PandaDoc), and external data sources as required
• Build and maintain webhook handlers and asynchronous processing pipelines for event-driven workflows

Authentication, Security & Access Control

• Implement and manage secure authentication and authorisation mechanisms including JWT, OAuth 2.0, and role-based access control
• Design multi-tenant data architectures ensuring strict data isolation between client organisations
• Apply secure coding practices and actively mitigate common web security risks (OWASP Top 10)
• Support on-premise and private cloud deployment requirements for data-sensitive systems where no external data transmission is permitted

Database Design & Optimisation

• Design, normalise, and optimise relational database schemas in PostgreSQL or MySQL for performance at scale
• Write efficient queries, implement appropriate indexing strategies, and resolve N+1 and slow-query issues
• Design and manage database migrations safely in production environments
• Work with MongoDB or other document databases where project requirements demand a non-relational approach

AI & Intelligent Systems Integration

• Integrate local LLM runtimes (e.g. Ollama) and AI processing pipelines into backend services for intelligent document extraction and automation workflows
• Build and maintain backend services that interface with OCR engines (Tesseract), NLP libraries (spaCy), and vector databases for AI-powered applications
• Design API layers that expose AI capabilities to frontend applications in a secure, performant, and maintainable way

Performance, Scalability & Reliability

• Monitor and improve API performance, response times, and system reliability under production load
• Implement caching strategies (Redis, in-memory) to reduce database load and improve response times
• Design backend services to handle concurrent users and high-volume data workflows
• Troubleshoot, debug, and resolve backend issues in production and non-production environments with structured root cause analysis

DevOps Collaboration & Deployment

• Support CI/CD pipeline configuration and deployment workflows in collaboration with the cloud engineer
• Write Dockerfiles and support containerised deployment of backend services
• Manage environment configurations, secrets, and environment variables following security best practices
• Participate in code reviews, contribute to coding standards, and maintain technical documentation for APIs, services, and key workflows

Key Deliverables

• Production-grade backend services and APIs delivered across Loch's active product portfolio
• APIs built to specification with consistent error handling, authentication, and documentation
• Database schemas and queries that meet performance and reliability requirements at scale
• Secure, data-isolated multi-tenant architectures across client-facing products
• AI and document processing backend integrations operational and maintainable
• Technical documentation maintained for all services, endpoints, and key workflows
• Incidents and production defects resolved within agreed timeframes

Essential Skills

• 3 to 5 years of backend development experience delivering production-grade web applications
• Strong proficiency in Node.js (Express or NestJS) and/or Python (Django or FastAPI) — candidates with both are strongly preferred
• Proven experience designing and building RESTful APIs and consuming third-party APIs at scale
• Strong understanding of relational databases (PostgreSQL preferred, MySQL acceptable) including schema design, query optimisation, and migration management
• Solid experience with JWT authentication, OAuth 2.0, and role-based access control implementation
• Knowledge of secure coding practices and ability to identify and mitigate common web vulnerabilities
• Experience with multi-tenant SaaS architecture and data isolation patterns
• Familiarity with Redis or similar caching systems for performance optimisation
• Working knowledge of Docker and containerised application deployment
• Experience with Git, branching strategies, code reviews, and collaborative development workflows
• Familiarity with at least one cloud platform (AWS preferred; GCP or Azure acceptable)
• Strong problem-solving skills and ability to work independently across multiple concurrent projects

Desirable Skills

• Experience integrating local LLM runtimes (Ollama, LlamaIndex) or AI APIs (OpenAI, Vertex AI, Amazon Bedrock) into backend services
• Exposure to OCR engines, NLP libraries (spaCy), or document intelligence pipelines
• Experience building e-commerce backends with payment gateway integrations (Razorpay, Stripe)
• Familiarity with WebSockets or Server-Sent Events (SSE) for real-time data delivery
• Experience with GraphQL API design and implementation
• Exposure to message queues (Kafka, RabbitMQ, BullMQ) for async processing workflows
• Experience with CI/CD pipeline configuration (GitHub Actions or equivalent)
• Basic understanding of AR or 3D asset delivery systems (relevant to AR packaging and beauty platform builds)
• Experience building or supporting on-premise deployments for data-sensitive systems

Qualifications

• Bachelor's degree in Computer Science, Engineering, or a related field preferred
• 3 to 5 years of demonstrable backend development experience with a portfolio of production-deployed applications
• Proven track record of delivering backend systems across the full development lifecycle — from requirements through to deployment and maintenance

Compliance and Confidentiality

• All development work must be performed using approved systems, repositories, and environments
• Source code, credentials, API keys, test data, and configuration details must be handled in line with internal security and confidentiality protocols
• Production and client data must not be copied to personal devices or unapproved tools or environments
• Any exposure to client systems or information must be for authorised business purposes only and logged in accordance with internal processes.

Employee Benefits

• 4 weeks of paid annual leave
• Health insurance coverage
• Provident Fund (PF) as per statutory norms
• Performance‑linked incentives as per company policy