Software Developer & Founder building and operating production software end-to-end — from database architecture and resilient APIs to adaptive AI workflows and zero-downtime deployments.
Systems architecture, type-safe full-stack execution, and applied AI workflows that deliver real business metrics.
I build, ship, and operate production software end-to-end — database architecture, backend microservices, LLM prompt engineering, responsive frontends, deployment automation, and continuous monitoring. I own the entire path from technical requirements to production reliability.
As founder of InterviewEra, I engineered an AI-powered mock interview SaaS running voice and technical interviews with adaptive LLM follow-ups, ATS resume scoring, and programmatic SEO reaching 27.8K+ impressions.
Beyond my own products, I take on selected freelance and contract engineering projects — partnering with early-stage founders and technical teams to deliver clean SaaS MVPs, performant REST APIs, AI features, and backend system fixes.
AI-powered interview preparation platform built and operated independently by Rakesh Kumar. Delivers adaptive technical & behavioral sessions with real-time speech processing, rubric-based grading, and instant feedback.
Explore Macro System Topology (HLD) and Micro Execution Mechanics (LLD).
Real-time mic PCM capture, audio waveform rendering, low-latency UI updates & programmatic SEO routes.
Full-duplex audio stream orchestration, JWT authentication, rate-limiting, and interview lifecycle routing.
Multi-tenant relational schemas, session state snapshots, row-level locking & Redis audio ring buffers.
Sub-second speech-to-text, prompt-chained adaptive follow-up engine & neural voice audio synthesis.
Static interview questions and rote flashcards fail to replicate the real-time cognitive load of live interviews — candidates lack adaptive follow-up questions, voice pacing practice, and objective rubric scoring.
An autonomous AI interviewer that conducts voice-enabled technical and behavioral sessions with dynamic follow-ups, resume-conditioned questioning, multi-dimension scoring, and actionable feedback reports.
Scores candidate resumes against target job descriptions for keyword relevance and ATS parse compliance.
launch tool →Generates customized role- and resume-specific technical and behavioral questions on demand.
launch tool →Structures rough candidate career stories into clear Situation-Task-Action-Result interview responses.
launch tool →An active community built around InterviewEra sharing interview preparation strategies, system design discussions, and placement opportunities.
Rubric-conditioned evaluation without LLM hallucination drift. Scoring evaluates candidate transcripts across five distinct technical dimensions against standardized rubrics rather than free-form LLM judgment. This guarantees reproducible, fair scoring regardless of candidate phrasing or model temperature variations.
A curated collection of production products, backend systems, and open-source engineering implementations.
Full-scale AI interview preparation platform serving 200+ registered users and 500+ interviews with voice AI, resume-based adaptive questions, and 250+ SEO pages.
Compliance-grade e-waste collection & traceability platform for India — pickups, lot management, recycler intake, audit trails, and EPR reporting across citizens, hubs, and recyclers.
AI-powered career roadmap generator — maps candidate skills against target job descriptions and generates structured module tracks with automated assessments.
Full-stack AI placement assistant built during a 24-hour hackathon — resume parsing, job matchmaking, and mock-interview feedback across 10+ modules.
Production-grade prioritized asynchronous task worker system ensuring strict execution order (HIGH > MEDIUM > LOW), database row-level locking for concurrency safety, and idempotent retries with exponential backoff.
Scalable financial transaction API with JWT authentication, category management, analytics aggregation, cursor/offset pagination, and Swagger OpenAPI documentation.
Enterprise-style task management system with role-based access control (RBAC), protected API endpoints, audit activity logs, and real-time dashboard metrics.
Type-safe backend API following Contract-Driven Development (CDD) principles, end-to-end type inference, strict input schema validation, and structured error boundaries.
Streamlined campus recruitment platform connecting students and placement coordinators with job tracking, eligibility filters, and drive scheduling.
Privacy-first health record management system with emergency break-glass access protocols and granular consent-based medical data sharing.
Nirog Bharat – A privacy-first digital health platform with consent-based data sharing and emergency access
Role-based task management system with secure JWT authentication, admin dashboard, activity logging, protected APIs, and analytics. Built using Node.js, MongoDB, React.js, and reusable scalable architecture with proper RBAC and access control.
A secure and scalable Expense Tracker API built with Node.js, Express, PostgreSQL, and Prisma. Features JWT authentication, transaction management, category support, analytics, filtering, pagination, and Swagger API documentation with clean RESTful architecture.
Production-grade prioritized async task processing system built with FastAPI, Celery, Redis, and PostgreSQL. Ensures strict priority execution (HIGH > MEDIUM > LOW), concurrency safety using row-level locking, idempotent retries with exponential backoff, and worker crash recovery.
A production-grade REST API built with TRPC, Express, and TypeScript following Contract-Driven Development (CDD) principles.
I partner with startup founders, SaaS teams, and businesses to turn product requirements into resilient, well-architected production systems.
End-to-end production web applications with responsive UIs, clean state management, database schema design, and secure authentication.
Autonomous enquiry agents, multi-step LLM reasoning, workflow design, n8n automation pipelines, and automated prompt chaining.
Automated inbound/outbound IVR calling agents, real-time speech processing (Deepgram STT & ElevenLabs TTS), and voice state management.
WhatsApp Business API integrations, automated customer enquiry bots, lead capture pipelines, and multi-channel notification systems.
High-performance REST APIs, background task queues, priority task workers, row-level locking, rate-limiting, and DB indexing.
Deep diagnosis of production bugs, slow database queries, security audits, auth vulnerability remediation, and API modernization.
In-depth review of product goals, technical requirements, edge cases, and scope.
Define system architecture, database schema, tech stack, and clear milestones.
Iterative engineering with clean code, frequent updates, and staging previews.
Functional verification, edge-case testing, security checks, and performance audit.
Zero-downtime production deployment, environment setup, and CI/CD pipelines.
Post-launch verification, bug fixes, documentation handoff, and agreed maintenance.
Architected and shipped production REST APIs integrating 5+ third-party services. Optimized MongoDB query aggregation pipelines cutting processing latency by 30% and patched critical authentication vulnerabilities, reducing security exposure by 40%.
Advanced Data Structures & Algorithms, Operating Systems, Distributed Systems, Database Management Systems, and Machine Learning.
Core software engineering, modern web technologies, scalable database architectures, and distributed systems design.
Built and scaled an AI mock interview SaaS serving 200+ registered users and 500+ completed interviews.
Maintained 800+ GitHub contributions over the last year across 24 public engineering repositories.
Awarded 2nd place among 50+ teams at BIT Mesra for building decentralized patient data validation.
Solved 700+ algorithmic challenges covering dynamic programming, graphs, trees, and system design.
Ranked in the top 5% nationwide in Cyber Security & Privacy examination by NPTEL/IIT.
Awarded Elite certification for advanced object-oriented programming and software architecture.
Built a decentralized healthcare data ownership solution enabling cryptographic patient consent verification and emergency access. Secured 2nd place among 50+ competing teams.
An interactive terminal shell. Ask about the production tech stack, verified platform metrics, services, engineering projects, or run commands.
Whether you're exploring InterviewEra or looking for an engineer to architect and build your product, let's connect and figure out the right next step.
Every engagement is priced transparently around your technical complexity, delivery timeline, and specific budget — from early-stage MVPs to specialized AI workflows and backend systems.
Available for full-stack and AI engineering opportunities as well as selected freelance and contract projects. Let's discuss your product requirements, MVP roadmap, or engineering challenge.
Zero-to-one product, database schema, payments & dashboard
