Elijah Serreywoth NhekI build reliable software for complex business processes

Application and Integration Developer based in the Luzern region, working across APIs, business software, system integrations and modern web interfaces with C#, ASP.NET Core, React, databases and automation technologies

Explore flagship builds View professional path

2026EFZ completed

2024Integration role since

03Core projects

Products shaped around real workflows

Three projects that show how I approach architecture, user experience, data and integrations from the first requirement through to a working application

Receipt upload

→

AI extraction

→

Booking draft

IPA project · Full-stack application

BuchungsAPI / KIBuchungsApp

An AI-assisted booking application developed for my IPA. It combines an ASP.NET Core backend with a React and TypeScript frontend, supports manual bookings and receipt uploads, extracts and maps receipt data with OpenAI, and integrates accounting data through Webling

Encrypted settings storage, session-based access control and validation
AI extraction and mapping workflow for uploaded receipts
Accounting adapter, booking APIs and automated tests

ASP.NET CoreReactTypeScriptOpenAIWebling API

Private repository

Personal project · Learning platform

KartAI

A structured flashcard learning platform with themes and subthemes, JSON content import, a study mode, overview pages and a persistent navigation system. The application was designed as a practical learning tool that could later support users, roles and progress tracking

React, TypeScript, Vite and Tailwind frontend
ASP.NET Core API with MongoDB persistence
Theme hierarchy, study flow and security-focused iterations

ReactTypeScriptTailwindASP.NET CoreMongoDB

In development

Personal product · Flexible productivity system

LifeBoard

A highly customisable productivity platform built around user-created widgets and pages. The concept combines a visual editor, reusable variables, relationships between widgets and a logic system that can be edited visually or through code without breaking existing connections

Custom widget design, variables and behaviour
Page-level relationships and data flow between widgets
Visual logic editor with an optional code-based workflow

Product architectureVisual editorData relationshipsAdvanced UI

Product in development

Systems I have built, connected and documented

Professional and educational work that demonstrates integration development, backend engineering, data handling, asynchronous processing and technical documentation

pDDP integration & LPScannerApp

Worked with cross-border postal and customs workflows connecting internal applications, IPC data, customs declaration XML, DAKOSY, Versandtool 2.0, Lobster_data and ERP billing processes. I also produced detailed technical documentation and architecture flows

Mapped the end-to-end parcel, customs and billing flow across several systems
Documented API, XML and architecture boundaries with Mermaid diagrams
Translated a complex logistics process into understandable technical documentation

APIsXMLLogisticsCustomsDocumentation

Odoo AI connector & ERP integration

Worked on an Odoo 18 connector with protected JSON endpoints, service and controller separation, audit logging and restricted draft workflows. I also explored LibreChat account mapping and AI tool integration around Odoo business processes

Structured protected JSON endpoints with controller and service separation
Worked with audit logging, restricted draft workflows and ERP business rules
Investigated LibreChat account mapping and AI-tool access through Odoo users

Odoo 18JSON APIsAI toolsSecurityERP

Doctor data & case management APIs

Built ASP.NET Core and MongoDB prototypes for doctor data, filtering, email usage tracking, case creation, document handling and encrypted case storage, with Form.io-based frontend workflows

Implemented filtering, email usage tracking and case-creation endpoints
Mapped Form.io payloads to ASP.NET Core and MongoDB data models
Worked with document handling and encrypted persistence for case data

ASP.NET CoreMongoDBForm.ioEncryption

MassTransit & RabbitMQ patterns

Created examples for message publishing, consumers and saga state machines with MassTransit and RabbitMQ, including configuration guidance for understanding asynchronous workflows

Built publishers, consumers and saga state-machine examples
Worked with correlation, scheduled transitions and asynchronous error handling
Created a public guide that explains the configuration and message flow

MassTransitRabbitMQSagasC#

View public repository ↗

Country Information XML

Built an ASP.NET application around a SOAP country-information service, including XML parsing and presentation of country, currency and language information

Consumed a SOAP country-information service from an ASP.NET application
Parsed XML responses for country, currency and language information
Presented external service data through a clear MVC interface

ASP.NETSOAPXMLMVC

View public repository ↗

PendeloApp

Contributed to an earlier web application featuring bicycle CRUD workflows, company locations with Google Maps, user activity views, leaderboards, likes and an administration dashboard

Built bicycle CRUD workflows and company-location views with Google Maps
Added activity views, leaderboards, likes and an administration dashboard
Improved the interface and navigation through several design iterations

Web applicationCRUDGoogle MapsAdmin UI

View public repository ↗

Tools I use as part of complete solutions

The technology matters, but the value comes from knowing where each tool belongs in the architecture

Languages & frameworks

C#Application logic

.NETRuntime ecosystem

ASP.NET CoreAPIs and services

PythonScripting and tooling

TypeScriptTyped frontend

JavaScriptBrowser logic

Frontend & UI

ReactInteractive interfaces

HTML & CSSResponsive UI

Tailwind CSSComponent styling

Form.ioDynamic forms

Data & messaging

MongoDBDocument data

PostgreSQLRelational data

SQL ServerEnterprise data

RabbitMQAsync messaging

MassTransitConsumers and sagas

Integration & tooling

OdooERP integration

OpenAI APIAI extraction

SOAP & XMLLegacy integration

OpenAPIAPI contracts

DockerLocal environments

GitVersion control

Application & Integration Developer — Internship

Algorithma GmbH · Luzern

Aug 2024 — Present

Working on APIs, system integrations and business software across ERP, logistics and healthcare-related workflows. My work includes C# and ASP.NET Core development, database integration, Odoo, Lobster_data, message-based processing, testing and technical documentation

C#ASP.NET CoreOdooLobster_dataMongoDBPostgreSQLScrum

Informatiker EFZ — Applikationsentwicklung

Benedict Schule Luzern

2022 — 2026

Completed the Swiss EFZ qualification in application development, combining software engineering fundamentals with practical full-stack, database, API and team-development assignments

Software engineeringWeb developmentDatabasesAPIsTeam projects

A few things about me

I am an Application Developer from the Luzern region of Switzerland. I completed my Informatiker EFZ in Application Development at Benedict Schule Luzern in 2026 and have worked in integration development at Algorithma GmbH since August 2024

My experience covers APIs, ERP and logistics integrations, healthcare data prototypes, messaging workflows, AI-assisted applications and technical system documentation. I am most comfortable when I can understand a real process, model it properly and build the software that connects the pieces

Luzern region, SwitzerlandApplication Development EFZGerman & EnglishOpen to opportunities

2026

EFZ completedInformatiker EFZ, Fachrichtung Applikationsentwicklung

2024

Professional integration workAPIs, ERP systems, logistics workflows and business software

Core personal projectsBuchungsAPI, KartAI and LifeBoard

Next opportunity

Bring me the process that needs a better system

I am open to professional opportunities in application development, integration development and business software, with email or phone as the fastest way to reach me

Send an email View LinkedIn

Phone+41 76 536 92 49Call GitHubgithub.com/AF1ROOpen ↗ LinkedInlinkedin.com/in/elijah-nhekOpen ↗