Backend / platform / data infrastructure
I build backend platforms, event-driven workers, query paths, recovery tooling, and provenance systems for production data products.
Selected backend achievements
2026
Fused eight filing-derived sources into canonical people, affiliations, roles, and append-only field provenance. The system runs resumably per company, keeps disputed fields traceable to source rows, and powers management views without every consumer reinventing trust ranking.
2026
Split analytical reads away from PostgreSQL row-store plans into DuckDB over S3-backed Parquet snapshots, with custom date ranges routed through the columnar path instead of the old fallback.
2026
Added Avro schemas, idempotent producer settings, manual commit semantics, deduplication keys, DLQ routing/replay, retry/backoff, health probes, consumer-lag visibility, resource limits, and ordered shutdown so redeploys and malformed events fail visibly.
2026
Restored deleted production rows from a point-in-time Neon branch through PostgreSQL dblink, then added a pre-commit migration scanner for destructive SQL patterns.
2025-now
Separated transformation logic for estimates, sales orders, and invoices from persistence, added PostgreSQL audit partitioning, and used Rust Decimal types across a Python/Rust boundary to prevent rounding drift.
2025-2026
Preserved incomplete checkout attempts, added gateway-initiation audit trails, and built polling-based wallet recovery with transactional row locking so automated sweeps and admin resolution could not lose updates.
Experience spine
Mar 2026 - Present
Backend/platform/data infrastructure across Fastify APIs, Python Kafka workers, PostgreSQL on RDS/Neon, Redis, DuckDB, S3/Parquet, Docker/EC2, and OpenTelemetry. Shipped management/provenance APIs, notification settings, screener alerts, and production observability surfaces.
Dec 2025 - Apr 2026
Contract backend work for financial transformation flows, precision arithmetic, and partitioned audit logging.
Sep 2025 - Feb 2026
Backend-heavy full-stack work across authentication, news content, subscriptions, payment flows, reporting, feedback, and tenant-aware access controls for a multi-tenant platform.
Apr 2025 - Feb 2026
Backend services in TypeScript, Express, gRPC, Kafka, PostgreSQL, authentication, authorization, query optimization, and service-boundary documentation.
Mar 2024 - Apr 2025
Modular TypeScript/Sequelize services, JWT/RBAC flows, query optimization with indexing/caching/batching/constraints, shared utilities, API design, and teammate mentoring.
2022 - 2024
Delivered a commercial bank information-management system as a freelancer, built backend scheduling/message-queue email flows at Brandbuilder Nepal, and worked across React, PostgreSQL, TypeScript, and build tooling at Pagevamp Nepal.
Education
2017 - 2023
Bachelor of Engineering in Computer Engineering, Tribhuvan University.
Academic systems projects
Built a protein contact-map prediction pipeline with sequence cleaning, duplicate removal, feature generation, reproducible train/validation/test splits, and CNN experiments; also built a face-recognition pipeline with preprocessing, augmentation, CNN embeddings, L2 normalization, and batch-wise cosine-similarity verification.