Martin Negin

Junior Fullstack Developer

B2B Integration Specialist at Verkkokauppa.com

Open to Junior Fullstack Developer roles

Helsinki, Finland

[email protected]

zroot.it

github.com/vem882

linkedin.com/in/mrnegin

Profile

I build and run B2B integrations for a living and I am moving that work into software development. At Verkkokauppa.com I lead procurement integration projects: cXML and OCI punchout, EDI order and invoice flows, Peppol and UBL messaging, and the supplier portals that sit around them. The job is equal parts XML mapping, API debugging and talking to the people on the other end of the connection.

Alongside that I am completing a Bachelor of Engineering in Information Technology with a Software Development specialisation at Oulu University of Applied Sciences. Coursework covers Node.js and React on the web side, Kotlin and React Native on mobile, and C++ for object-oriented and embedded work.

I write software with AI assistance and work in an agile way: small increments, early feedback, and working software ahead of documentation. LLM tooling is part of my normal loop for writing, refactoring and reviewing code, and I read and test what comes out of it rather than taking it on trust. AI also shows up on the delivery side of my job: SSH Communications Security's chat assistant for ordering work equipment runs against an API I specified and consulted on.

Ten years in commerce and procurement have made me comfortable across a wide range of systems, from Coupa and SAP Ariba to Linux servers, Cloudflare and Home Assistant. The more useful skill has been getting up to speed on an unfamiliar one quickly. I am looking for a junior fullstack role where that breadth, integration experience and a habit of automating the tedious parts are useful from day one.

Core competencies

System Integrations & EDI cXML and OCI punchout catalogues end to end, from session setup to order return · EDI order, order response and invoice flows over Peppol and UBL · Coupa Supplier Portal and SAP Ariba Business Network administration

Fullstack Development Node.js and Express REST APIs, EJS server rendering, caching and rate limiting · React, React Native and Expo for web and mobile front ends · Kotlin with Jetpack Compose for native Android

AI-Assisted Development, Agile Practice Agile delivery in practice: small increments, continuous feedback, working software over documentation · Daily use of LLM coding tools for implementation, refactoring and code review, with the output always read and tested before it ships · Delivered the API specifications behind SSH Communications Security's AI procurement assistant and consulted their team through the integration

Breadth Across Systems Procurement and supplier platforms: Coupa, SAP Ariba, Peppol access points · Document standards: cXML, OCI, UBL, EDI message families, XML schemas · Infrastructure: Linux, Nginx, Cloudflare, PM2, Docker, Firebase

Linux, Infra & Automation Linux server administration, Nginx reverse proxying and Cloudflare in front · PM2 process management, log rotation and health monitoring · Git-based deployment driven by signed GitHub webhooks

Technical skills

Languages: JavaScript, TypeScript, Node.js, Kotlin, C++, Python, SQL, HTML/CSS, Bash, Lua
Frameworks: Express.js, React, React Native / Expo, Jetpack Compose, EJS, Electron, ESPHome
Integrations & EDI: cXML Punchout, OCI Punchout, Peppol, UBL, EDI, Coupa, SAP Ariba, XML / XSD
AI & automation: AI-assisted development, Agile working methods, LLM API integration, AI for document parsing, Workflow automation, Home Assistant / IoT
Tools & infra: REST APIs, Git, Linux, Docker, Nginx, PM2, Cloudflare, Firebase, MySQL, PostgreSQL

Professional experience

Verkkokauppa.com

6 years 11 months

B2B Customer Integration Specialist Nov 2024 – Present

Responsible for leading procurement system integration projects for business clients at Verkkokauppa.com. Tasks include managing, monitoring, troubleshooting, and further developing integrations. Additionally, serve as an administrator for various supplier portals such as Coupa Supplier Portal and SAP Ariba Business Network, ensuring smooth connectivity and data exchange between systems.

Key contributor on the SSH Communications Security delivery: wrote the interface specifications for their AI-assisted equipment ordering assistant and consulted their team through the integration, which went live in a few weeks
Lead integrations across punchout catalogues, EDI order and invoice traffic, and Peppol messaging, from requirements through go-live
Administer the Coupa Supplier Portal and SAP Ariba Business Network connections
Diagnose failed transactions end to end, across the customer, the middleware and our own systems

Wholesale Sep 2022 – Nov 2024

B2B Sales May 2021 – Aug 2021

Export Sales Mar 2020 – Aug 2022

Customer Service Agent Oct 2019 – Mar 2020

Power Finland

3 years 5 months

Department Manager Jan 2019 – Oct 2019

Management of Data & Gaming department.

Sales May 2016 – Oct 2019

Expert ASA Oy

2 years 10 months

Sales Jul 2013 – May 2016

Retail sales and customer service.

Selected projects

Ediwire 2026 – Present

Own SaaS product · React, Vite, TypeScript, EDI, SaaS

A SaaS EDI operator I am building: it receives business documents, converts them between formats and delivers them in whatever format each trading partner expects. The idea comes straight from the day job, where most integration effort goes into reconciling the same document expressed five different ways. Built as a React and Vite single-page application on a hardened, Cloudflare-fronted deployment.

zroot.it 2024 – Present

Personal infrastructure · Node.js, Express, EJS, GitHub API, Nginx

This site. A server-rendered Node.js and Express application that pulls live data from the GitHub API, caches it, and renders it through EJS. I wrote it, I host it and I maintain the machine it runs on. Development is AI-assisted end to end, from feature drafts to refactoring.

Git Repo Updater 2024

Personal tool · Bash, Git, Automation, JSON

A shell tool for keeping many GitHub repositories in sync at once. Repositories, branches and target directories are declared in a repos.json file, so adding a new repository to the rotation is a config change rather than a code change.

ESP32 Home Assistant Sensors 2025

Home automation · C++, ESP32, Home Assistant, ESPHome, IoT

Firmware for ESP32 boards that report sensor readings into a self-hosted Home Assistant instance. Part of a wider home automation setup that also includes an ESPHome component for an IVT Rego1000 heat pump controller.

Home Assistant Temperature Widget 2025

Personal tool · JavaScript, Electron, REST API, Home Assistant

A small Electron desktop application that reads a Home Assistant entity over its REST API and keeps the current temperature visible on the desktop. Built to stay out of the way: no window chrome, minimal footprint.

Education

Bachelor of Engineering (BEng), Information Technology: Option of Software Development January 2024 - December 2027

Oulu University of Applied Sciences · In Progress

Vocational Qualification in Business, Business October 2021 - March 2023

Rastor-instituutti · Completed

Certifications

Accessibility — Oulun ammattikorkeakoulu 2023
Copyrights — Oulun ammattikorkeakoulu 2023
Tool Software — Oulun ammattikorkeakoulu 2023
Data protection and information security — Oulun ammattikorkeakoulu 2023
Digital and IT skills — Oulun ammattikorkeakoulu 2023
HP Amplify Elevate 2025 for Supplies — HP 2025
HP Amplify Elevate 2025 for Personal Systems — HP 2025
HP Amplify Elevate 2025 for Poly — HP 2025
HP Amplify Elevate 2025 for Print — HP 2025

Languages

Finnish Native or Bilingual
Russian Native or Bilingual
English Professional Working