Feb 2026 – Mar 2026 · 1 mo · Hanoi, Hanoi, Vietnam · On-site

• Bakery, cafe and 24/7 delivery

Dec 2025 – Feb 2026 · 2 mos · Remote

• ▶ End-to-end ownership of backend platforms handling data pipelines, automation, and production operations.
• Designed, deployed, and maintained a multi-region distributed system from scratch.
• Implemented a hybrid event-driven architecture with custom ETL pipelines for data fetching,
• normalization, caching, and reuse.
• Introduced multi-layer caching, including DNS-level caching for outbound requests, reducing response
• times from 8 seconds to under 3 seconds.
• Built event-driven automation for content (image/video) generation and publishing using FaaS under
• execution constraints, including posting to social platforms via their APIs.
• Owned production operations: monitoring (Sentry), runtime analysis, hot-fixing incidents, and
• performance tuning.
• Set up CI/CD (GitLab), infrastructure deployment, domain routing, SSL, Cloudflare-based traffic
• routing and security, and Nginx-level enforcement; implemented a security-conscious frontend with
• minimal JavaScript and request-level tokenization.

Nov 2025 – Dec 2025 · 1 mo · Remote

• ▶ End-to-end ownership of a production backend platform for content ingestion, processing, and delivery.
• As a contract Senior Software Engineer & Backend Architect:
• Designed and built a full online cinema platform from scratch, covering system architecture,
• backend services, as well as API gateways and custom internal tooling tailored to project-specific requirements.
• Designed and implemented a request orchestration layer to ingest content metadata and media streams
• from multiple external platforms with heterogeneous and poorly documented interfaces.
• Analyzed and reconstructed external request flows through detailed traffic inspection and protocol
• decoding to ensure reliable data acquisition.
• Implemented multi-stage asynchronous pipelines in Python for content ingestion, normalization,
• processing, and delivery.
• Integrated a GIL-free Python runtime and background executors to separate I/O-bound and
• CPU-bound workloads, increasing throughput by 30%, reducing p95 latency by 40%, and lowering
• infrastructure costs by 20%.
• Introduced DNS-level and application-level caching, reducing external request volume by 60%, cutting
• average latency by 50%, and improving system stability.
• Offloaded compute-intensive tasks to FaaS (AWS Lambda), reducing backend CPU utilization by 40%,
• lowering peak memory pressure, and preventing request timeouts under load

Jun 2025 – Dec 2025 · 6 mos · Hai Phong, Vietnam · Hybrid

• ▶ As a contract software engineer, I worked within a self-contained project capsule, independently developing and maintaining components for an internal system focused on task management, communication and progress tracking under strict NDA guidelines.

Jan 2024 – Mar 2025 · 1 yr 2 mos · Remote

• ▶ Backend development for a digital content ecosystem
• Designed and built a digital content platform in Ruby on Rails, handling secure crypto payments at production scale.
• Defined and implemented a transaction management system to ensure data consistency across distributed components.
• Engineered real-time communication using WebSocket, enabling low-latency data flow between backend services and client applications.
• Architected and maintained independent microservices for data extraction, API integrations, and web parsing.
• Designed and implemented user authentication and authorization flows using OAuth 2.0.
• Led the integration of multiple applications into a unified ecosystem with shared identity and accounts.

Jan 2023 – Mar 2023 · 2 mos · Remote

• ▶ Short-term contract to recover and stabilize a failed data collection pipeline after vendor collapse.
• Replaced a failed and unreliable data collection setup after vendor failure, allowing the client to resume operations without restarting the project or increasing budget.
• Delivered a low-maintenance, predictable data pipeline that ran unattended and produced audit-ready data for downstream use.
• Optimized for stability and cost-efficiency over complexity under tight time and budget constraints.

Sep 2022 – Mar 2024 · 1 yr 6 mos · Hybrid

• ▶ Booking data aggregation system for Big Tech (NDA)
• ▶ Backend development and deploy of an internal corporate system for educational sector
• Designed and delivered a Django-based internal system under tight deadlines.
• Implemented role-based access control for administrators, teachers, students, and parents.
• Designed captive portal access over the institution’s Wi-Fi with QR-based entry to the internal system.
• Built branded reports and student records.
• Implemented centralized logging and operational alerts.
• Tech stack: Python, Django, PostgreSQL, Nginx, ClickHouse, JavaScript
• ▶ Backend MVP development for a banking application.
• Implemented a backend MVP for account management and transaction tracking.
• Added Kafka-based event handling and Redis caching to handle frequent reads with lower latency.
• Set up centralized logging and basic monitoring to observe system behavior in production.
• Tech stack: Ruby, Ruby on Rails, PostgreSQL, Redis, Kafka, ElasticSearch, Grafana

Nov 2021 – Aug 2022 · 9 mos · Kyiv, Ukraine · Remote

• ▶ Development of sales, analytics, and customer loyalty covering system for retail
• Designed and built a multi-terminal cashier system with concurrent access to a shared PostgreSQL database on a local network.
• Implemented stock deduction and pricing logic at the database level to prevent double-selling during simultaneous checkouts; enforced row-level locking for checkout and bulk stock updates.
• Implemented real-time price calculation based on stored product and customer data.
• Designed and exposed an API with strict role separation for cashiers, managers, and owners.
• Integrated USB barcode scanners (HID mode) and thermal receipt printers for automated checkout.
• Collected sales and inventory data and generated analytical reports using direct database queries.
• Tech stack: Python, FastAPI, PyQt5, PostgreSQL, SQLAlchemy, Pandas, python-escpos, FPDF.
• ▶ Development of a Pharmaceutical organization system for clinical operations
• Developed a Django-based web application for a healthcare clinic to manage patient appointments and basic medical records. The goal was to automate manual processes and improve patient experience.
• Created an appointment scheduling system where patients could book, reschedule, or cancel appointments.
• Developed a patient profile page to display medical history and upcoming appointments.
• Set up a PostgreSQL database to store patient information, appointments, and medical records.
• Tech Stack: Python, Django, PostgreSQL, Twilio, HTML, CSS

Oct 2021 – Nov 2025 · 4 yrs 1 mo · Moscow, Russia · Remote

Apr 2019 – Sep 2019 · 5 mos · On-site

• ▶ Provided technical support and ensured the smooth operation of IT systems.
• Provided technical support to embassy staff, resolving hardware, software, and network issues.
• Maintained and updated IT infrastructure, including computers, printers, and network equipment.
• Ensured the security of IT systems and data.

May 2018 – Jan 2019 · 8 mos · Hybrid

• ▶ Provided expert consultation in OSINT and gave detailed trainings.

May 2017 – Jul 2017 · 2 mos

• ▶ Completed a full-stack apprenticeship that helped me discover my sympathy for backend development and refine my technical skills.
• Gained hands-on experience with SQL, PostgreSQL, and Node.js.
• Contributed to the development of backend services.
• Learned about software development methodologies and best practices.

Jan 2014 – Jan 2015 · 1 yr

Dec 2012 – Dec 2014 · 2 yrs

Jan 2010 – Jan 2011 · 1 yr · On-site

• Assisted users with basic internet connectivity and networking issues
• Performed router diagnostics and guided customers through troubleshooting
• Logged incidents and escalated complex cases to senior staff

Jan 2000 – Jan 2005 · 5 yrs

• Positions: LM, LW, CDM