05/23/2026 updated

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Full Stack Developer / Mobile Developer

Delft, Netherlands
Worldwide
BSc Computer Science
Delft, Netherlands
Worldwide
BSc Computer Science

Profile attachments

robert tessler resume 11.pdf

About me

Full Stack Developer and mobile developer with 10+ years of experience. Specialising in React.js, Node.js, Typescript, Python,Swift, SwiftUI, Kotlin, Flutter, React Native and cloud services.

LLMSupabaseFlutterJava (Programming Language)Apple IOSMobile Application DevelopmentDevOpsDjangoGitHubNode.jsRedisFront End (Software Engineering)React.jsSwiftuiExpress.jsSpring BootIos FrameworksGoogle FirebaseBackendFastAPIKotlinKubernetesFull Stack DevelopmentGraphQLReact NativeFront End Software DevelopmentDocker
Core Stack Python, Javascript, Typescript, Java, Kotlin, C++.
Frontend React.js, Next.js, Vue.js, HTML, CSS, SCSS, Three.js, Unity.
Backend Node.js, FastAPI, Spring Boot, .NET, GraphQL, Django.
Mobile Swift, SwiftUI, Jetpack Compose, React Native, Flutter.
Database Postgres, MongoDB, MySQL, ORMs.
Cloud AWS, Firebase, Supabase.
Deployment Github Actions, Gitlab pipelines, Docker, Kubernetes.
AI & ML RAG, Langchain, OpenAI API, LLMs.
Other Technical Lead, System Architecture, Agile Methodologies.

Languages

EnglishNative speaker

Project history

Founder

SixOfNine Engineering

Other

< 10 team member

  1. Engineered a Python/FastAPI mage processing service using ML for black-and-white to colour photo conversion. Deployment of containerized services using AWS Lambda, S3, IAM, EC2, ECS, Docker and Kubernetes
  2. Developed a IOS / Android offline music player app, coding in Swift / SwiftUI, Android Kotlin, Jetpack Compose, MVVM, React Native.
  3. Built a vocal replacement VST plugin, coding in C++11, DSP and JUCE framework.
  4. Developed an architectural 3D visualization web app and model generation using RAG, OpenAI API, Langchain, LLM prompt engineering.
  5. Frontend development in React.js, Vue.js, Typescript, OpenGL, Three.js and Unity for interactive data visualisation systems

Fullstack Developer

Poolder

Banking & Financial Services

10-50 team member

  1. Architected and deployed a SaaS crypto currency trading platform using React.js, Next.js, TypeScript, Postgres, Tailwind and ApexCharts.
  2. Created secure admin interfaces for monitoring and processing orders and improving onboarding workflows.
  3. Enhanced data visualization components for tracking client asset values.
  4. Improved user experience by added buy and sell notifications, messaging functionality.
  5. Utilised Supabase for backend edge functions with deployment to Vercel using Docker and Gitlab pipelines

Full Stack Developer

Sping

Internet & IT

10-50 team member

Development of the QC One React Native app for fruit and vegetable inspections serving 18,000 users. Added features to the HVG Tessa Android Kotlin app for marine steel product inspections

• Optimised networked data sync for QC One, coding in React Native, Typescript, MobX State Management, Realm database, Sentry logging, notifications, efficient rendering, TDD, DDD, unit, integration and end to end testing using Jest
• Reduced download times for the Tessa app, Kotlin, GraphQL, Coroutines, Flow, Room DB, Retrofit, Hilt, MVVM, Jetpack Compose, Clean Architecture.
• Deployed to app stores using Fastlane and GitHub actions CI/CD.
• Ran a research project on selective noise cancelling, Python, FastAPI, React.js
• Created an energy usage calculator for the energy sector, algorithmic coding in Kotlin
• Agile: stand ups, sprint planning, refinements, retrospectives, Jira tasks.

Mobile / Full Stack Developer / Tech Lead

Sway Music

< 10 team member

Engineered a cross platform music streaming app for sharing playlists between Apple Music and Spotify. Coding in Flutter, Swift, SwiftUI and Kotlin.

  1. Developed an innovative cosine similarity text similarity song matching algorithm
  2. Developed a Flutter app, a SwiftUI app plus IOS and Kotlin native components for audio playback using Apple Music and Spotify APIs.
  3. Use of Google Vision API, GCP. Implemented notifications, chat functionality, audio streaming, real time update. Figma designs, app store deployment, OAuth2 authorisation, UI/UX design.
  4. Firebase backend development database operations and image upload. API development in Node.js / Express.js, Javascript, Python, Authentication, Cron based scheduling.
  5. Developed an admin portal in React.js for monitoring users and playlist generation.

Mobile Developer

Knab Bank

Improved the KNAB banking app onboarding flow to make signup simpler and increase client registration numbers. Use of IOS Swift, UIKit, Core Data, Reactive Programming, MVVM, OOP.

Mobile / Full Stack Developer

Sublime X Remote
  1. Developed a mobile Flutter app and admin web site in React.js, Redux for Marine Rescue NSW for reporting marine hazards in coastal waters. The MRNSW Risk App.
  2. Created an IOS Swift app and React.js web app for the Pepsi Cola Taste Challenge.
  3. Deployed to IOS and Android app stores
  4. API development in Firebase and GCP using Node.js, Express.js, Typescript and Python. Image upload, OAuth2 authentication, PDF generation.
  5. Did maintenance of the APTC Fiji technical college website using.NET Core, C#, ASP.NET, .NET MVC, HTML, CSS, SASS and Sitefinity CMS.
  6. Implemented automated data processing and upload into a Hubspot CMS for Crescent Wealth using Python, Pandas, shell scripts, Java, Spring Boot, Maven, Redis, Kafka messaging and AWS.

Full Stack Developer

MercerBell (Saatchi & Saatchi)
  1. Built a React.js hearing test web app for Cochlear with Marketo and Salesforce REST API integrations; unit and integration tested with Jest.
  2. Developed a Node.js/Express.js REST API on AWS (S3, Lambda, API Gateway) for Toyota kiosk JSON data uploads.

Front End Developer

Deloitte
Relationship Access Manager system for the Australian Tax Office. The system allows companies that offer tax services to register with the ATO. Coding in Angular, RxJS, MongoDB, Jasmine.js, Agile, Typescript and Bootstrap

Front End Developer

Landsberry & James
Built ad campaign analytics and an interactive page builder in JavaScript/Angular/jQuery; Java/Spring Boot/MySQL/AWS backend.

Full Stack Developer

Mass Media / Holler
Built and enhanced client-facing .NET/ASP sites (Audi, Unilever, Unity Water) using C#, ASP.NET MVC, SQL Server, JavaScript Backbone.js, jQuery.



Desktop App Developer

Deutsche Bank
Created a derivatives auto-trading desktop app in C++ used by traders globally for automated opportunity detection.

Desktop App Developer

STN-Atlas Electronic

Industry & Mechanical Engineering

50-250 team member

• RAN Hydrographic Ship Project (HSS). Use of sonar to capture oceanographic data to
establish new shipping lanes in north Queensland. Data visualisation, C++, Oracle
database, UNIX RPC, shell scripting.

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