Nik Nenkov

Provide business technology consulting and hands-on full-stack delivery through Greenwall Business Systems. Lead defined engagements from discovery and requirements through solution design, implementation, testing, deployment, handover and production improvement. Build and modernise business systems with Java/Spring, React, TypeScript, PostgreSQL, REST APIs and Docker, and translate operational goals into maintainable workflows and integrations.

Independently designed and developed an integrated B2B back-office and ERP-style platform for spice import, processing, warehousing and wholesale operations. Covered catalogue, ordering, sales, supply, inventory, documents, transport, GPS and expense workflows. Owned business-process analysis, architecture, implementation, technical operations and coordination with the owner and external providers. Technologies: Java, Spring Boot, React, TypeScript, PostgreSQL, Docker and REST APIs.

Worked on a legacy financial and digital-assets codebase, creating extensive Selenium and Cucumber acceptance and end-to-end test coverage. Delivered product features, migrations and production fixes in an AWS environment using Terraform and Datadog. Strengthened regression protection by understanding existing business flows, reproducing defects and covering critical scenarios.

Assigned by PLAN A to SAP Ariba Business Network in a distributed international team. Worked on legacy Java and the Ariba Framework, adding substantial test coverage, stabilising existing behaviour and delivering a smaller number of new product features in an enterprise procurement and supply-chain environment.

Contributed to software supporting ticketing, reservations, scanning and validation, e-commerce and operational workflows for sightseeing and cruise services in the United States.

Delivered almost the entire Solar Band full-stack system for HEC Solar, a GPS hardware-asset tracking platform used by construction companies. Implemented most of the Vue.js frontend and Go backend and integrated the application with the MQTT broker maintained by the hardware engineering team; physical trackers supplied asset-location data automatically. Technologies: Vue.js, TypeScript/JavaScript, Go, MQTT, GPS, IoT and APIs.

Delivered three principal international client assignments: Axilion Smart Mobility (~10 months), Paysafe (~8 months) and GameAccount Network (~6 months). Built Java services for road-network and traffic-light data, SUMO simulations and virtual Econolite controllers; used Terraform, Jaeger and InfluxDB. Integrated Sportradar widgets into an Angular wallet WebView and created a reusable Angular/TypeScript library. Delivered loyalty and bonus-point features and mentored interns and junior developers.

Started technical delivery as the first developer, establishing the initial Java/Spring Boot codebase and API foundation before the local team expanded. Built Angular and backend functionality for vendor categorisation, performance analysis, business-spend visualisation and Excel import/export, working directly with German architecture and product leadership. Technologies: Java, Spring Boot, Spring Data REST/HATEOAS, Spring Security, Angular, TypeScript, Elasticsearch, PostgreSQL and Azure.

Joined as an intern for the first three months, then continued as a Software Developer. Built the complete cross-platform BIODIT administration product with JavaFX and Spring Boot for Windows and macOS. Integrated physical access-control devices through MQTT and a legacy database through ORM/JPA; solved complex UI, persistence and asynchronous device-workflow problems. Also contributed to internal EPAM tooling and engineering-community work.