Backend engineers

Backend-focused full-stack developer with about six years of software engineering experience across multinational companies. Worked with C#/.NET and Java/Spring Boot for backend services and REST APIs, and with React/TypeScript for user-facing features. Experience includes financial platform feature delivery, testing and release support, CI/CD and deployments, and tooling such as Grafana and CodeQL. Professional English usage is evidenced by IELTS 7.0 at work.

Java and Spring Boot engineer with experience delivering and optimizing backend microservices and REST APIs. Worked as a Technical Lead, improving API performance and leading development through Agile practices and code reviews. Has hands-on experience across AWS/Azure and relational data stores, with a focus on reliability, performance, and maintainability.

Interested in building real-time and distributed systems. I've built a real-time voice platform and a concurrent network simulator from the ground up, and I'm currently working on an object storage engine. I'm looking to work on hard backend and infrastructure problems where engineering depth matters.

Frontend app engineer (approx. middle level) focused on React-based single-page applications and site frontends with a strength in building booking and admin flows; the strongest proven skill is building SPA features and flows using React + Redux with concrete implementations in the ticket-booking pages (Shows, TheatersList, BookShow) that include API integration, form flows, modals and payment token handling; there is limited evidence of automated tests, advanced performance engineering, accessibility depth or large-scale architecture decisions in publicly visible code.

A frontend app engineer (mid-level) with practical experience building API-backed chat UIs and cross-platform React code. The strongest proven skill is integrating a server-side AI endpoint with robust request handling and typed application-level errors as shown in lib/nugen.ts and the app/api/chat route. There is little public evidence of automated tests, accessibility audits, or large-scale performance optimization work.

Cross-platform Flutter developer at a junior level focused on building multi-screen mobile UI prototypes. The strongest proven skill is building Flutter screens, navigation and basic stateful interactions as shown in Mind-Mugs Flutter files such as home.dart, room.dart and menu.dart. There is little to no evidence of offline sync, background work, permission handling, testing or release/CI practices in the public code.

Senior QA Engineer with around 9 years of experience in software testing, including 3+ years of QA team leadership. Experienced in manual testing of web and mobile applications, API testing, functional, regression, and end-to-end testing across multiple business domains. Skilled in test planning, test case design, defect management, release readiness, and Agile/SDLC/STLC processes. Proficient in using Jira, Azure DevOps, and Postman. Currently strengthening automation skills using Playwright and TypeScript, with basic hands-on exposure to performance testing using JMeter. Open to full-time, contract, freelance, and part-time QA opportunities.

Backend engineer (Middle, ~3.0) focused on Node.js scripting for blockchain integrations and tooling.

Technical Product Manager with 5+ years of experience building and improving B2B software products, including train and bus management systems for transport workflows. Experienced in discovery, requirements definition, delivery planning, launch support, and continuous improvement with engineering and QA teams. Also provides technical implementation and support experience, including monitoring, testing, and operational performance analysis.

A mid-level API-focused developer building lightweight ML inference services and web demos. The strongest proven skill is deploying an ML inference endpoint with practical memory and performance choices such as quantization, chunking, and per-chunk cleanup in backend-ai-detector/main.py. Production-ready concerns are not evidenced: there is no auth, no structured observability, no DB migrations, and CORS and secret handling are weak.

Full-stack Node.js and React developer (early-career) focused on building small e-commerce and admin CRUD flows with file upload support. The strongest proven skill is implementing end-to-end product CRUD with image upload, Cloudinary integration, and cleanup as shown in backend/src/controllers/productController.js. There is little public evidence of production-grade concerns such as schema migrations, retry/backoff strategies, structured observability, or hardened server-side auth.

QA Engineer experienced in manual testing and web application validation, including functional, regression, smoke, sanity, and UI checks. Hands-on experience validating REST APIs with Postman and automating web workflows with Playwright, plus defect documentation and retesting support. Also completed an AI-focused internship involving AI workflow testing and collaboration with developers.

Backend Node.js engineer at a middle level focused on building REST APIs and validation-heavy server logic. The strongest proven skill is robust input validation and test coverage as shown by backend/src/validation/ticketValidation.js and the corresponding unit and integration tests in backend/src/validation/__tests__/ticketValidation.test.js and backend/tests/integration/*.test.js. There is limited public evidence of advanced distributed systems design, schema migrations, production-grade observability or explicit retry/backoff and circuit breaker patterns.

Data analyst with 2+ years of experience building BI reporting and dashboards using Python and Power BI, including KPI-focused analysis and data-driven monitoring views. Previously worked as an Android developer, building mobile features with Java/Kotlin and integrating APIs and SQLite for app functionality. Focused on data processing, visualization, and troubleshooting for production systems.

Backend API engineer (Senior level) focused on asynchronous realtime systems and agent tooling. The strongest proven skill is building end-to-end realtime messaging and WebRTC/WebSocket plumbing, demonstrated by app/services/websocket_service/ws_endpoint.py and frontend call_session.py plus audio_manager.py. There is limited public evidence of production-grade infra like CI/CD, observability/metrics, and a documented DB migration history with evolution scripts.

Senior QA and software engineering leader with 11+ years of experience in test strategy, functional and automation testing, and release validation across enterprise and data-intensive platforms. Hands-on in Playwright/TypeScript and Cypress/JavaScript automation, API testing, and SQL-based data validation. Experienced in leading defect management, production support, and UAT sign-off for financial-services and GenAI-driven applications.

Backend-focused engineer (senior-level) with a strength for local-first, data-oriented tooling and demonstrable attention to data integrity and safety. The strongest proven skill is building a local synthetic scenario quality platform with careful schema migrations, signed replay artifacts, a safe SQLite job queue and benchmarking (see scenario_quality/engineering.py and scenario_quality/advanced.py). The public artifacts do not show production-grade service deployments, cloud infrastructure, or large distributed systems patterns such as durable, horizontally scaled queues or multi-service contracts.

Frontend app engineer (middle level) with practical experience building small interactive web apps and a browser-based game; the strongest proven skill is modular client-side state and async flow management demonstrated by the game modules with unit tests and a React useFetch hook that implements AbortController-based cancellation; what is not evidenced is large-scale architecture, measured performance tuning, robust accessibility on custom widgets, or production-grade backend integration patterns.