Mobile and Full Stack Developer

Robert Tessler Full Stack / Mobile Developer

Delft, Netherlands +31-061******* ******.*******@*******.*** SUMMARY

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. Emphasis on clean architecture, scalability and user experience. Able to manage projects, communicate with clients and mentor juniors.

SKILLS

Languages Javascript, Typescript, Python, Java, Kotlin, C#, C++ Frontend React.js, Next.js, Vue.js

Backend Node.js, FastAPI, Spring Boot, .NET, Kafka, Laravel, GraphQL Mobile Swift, SwiftUI, Kotlin, Flutter, React Native Database Postgres, MongoDB, MySQL

Cloud Services AWS, GCP, Firebase, Supabase

DevOps Github Actions, Gitlab pipelines, Docker, Vercel AI & ML PyTorch

3D Three.js, Unity

Version Control Git

Other Project Management, System Architecture, Agile Methodologies, Jira LINKS

github.com/rtessler

www.linkedin.com/in/roberttessler

EXPERIENCE

Full Stack Developer Jan 2025 - Jul 2025

Poolder Rijswijk, Netherlands

Added vital functionality to the Poolder crypto currency trading platform. Attracted more clients to the platform by upgrading the signup flow.

• Created secure admin interfaces for monitoring and processing orders and improving internal workflows

• Added admin mode screens for system upgrades

• Enhanced data visualization components for tracking client share value

• Added buy and sell notifications and messaging functionality

• Supabase, React.js, Next.js, Typescript, Postgres, Tailwind, Gitlab pipelines, Vercel, Docker

Mobile / Full Stack Developer Sep 2023 - Sep 2024 Sping Delft, Netherlands

Development of the QC One React Native mobile app for fruit and vegetable inspections serving 18000 users and maintenance of the HVG Tessa Android Kotlin app

• Optimised asynchronous data loading for QC One. Coding in Typescript, MobX, RealmDB, Jest unit and integration testing.

• Reduced load times and added functionality to the HVG Tessa Android app for marine steel product inspections. Coding in Kotlin, Java, GraphQL, Coroutines, Flow, Room, Retrofit, Hilt, N-Tier architecture, MVVM and Jetpack Compose.

• Deployed to IOS/Android app stores using Fastlane and GitHub actions CI/CD with automated regression testing.

• Conducted research projects on OCR and selective noise cancelling using Python, Google Vision API, FastAPI, Docker and Vue.js, Contributed to an energy usage calculator Kotlin project

• Agile methodologies: stand ups, sprint planning, refinements, retrospectives, Jira tasks. Founder May 2023 …

SixOfNine Engineering Delft, Netherlands

Developing a new products specialising in mobile development, AI, 3D and audio:

• Black and white to color image conversion service

• IOS mobile music player app

• Generative AI systems for 3D model creation and concert visuals

• Vocal replacement VST plugin

• Three.js and Unity Games

• Machine Learning, Python, PyTorch, FastAPI, Three.js, Unity, Swift, SwiftUI, Combine, C++, JUCE framework

Mobile / Full Stack Developer / Tech Lead Feb 2022 – May 2023 Sway Music London, Remote

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

• Use of Google Vision API, GCP. Implemented notifications, chat functionality, audio streaming, real time update, Figma and Zeplin designs, IOS / Android app store deployment.

• Developed an innovative cosine similarity text similarity song matching algorithm to find tracks on multiple music streaming platforms.

• Backend development database operations and image upload. Firebase cloud servers in Node.js, express.js, Javascript, Python and Flask.

• Developed an admin portal in React.js for monitoring users and playlist generation Full Stack Developer Jul 2021 - Jan- 2022

Twisted Rope Amsterdam

Developed a Javascript, React.js, D3.js web application for Accenture to visualise campaign data from a Sharepoint REST API.

• Updated Unity AR AReveryware and Pawpow apps for IOS and Android.

• Added features to the legato concert booking system using React.js, PHP, MySQL and Laravel

Full Stack Developer Oct 2020 - Jul 2021

Koda Design Sydney, Remote

Developed a web app for APTC Fiji using Sitefinity CMS, C#, ASP.NET and .NET MVC. An Australian initiative to help education in surrounding island nations and a SwiftUI app for Pepsi

• Created an IOS Swift App and React.js web app development for Pepsi Cola Taste Challenge. API development in Firebase and GCP using Node.js, express.js, Typescript.

• Automated import of data into Hubspot CMS using Python and shell scripts for Crescent Wealth.

• Maintenance of Crescent Wealth API using Java, Spring Boot, Spring Data JPA, Maven, Kafka, JUnit

IOS Developer Apr 2020 - Aug 2020

KNAB Amsterdam

Maintenance and development of the Knab banking app coding in IOS Swift

• Redefined the signup process to make it easy for users to register. Use of Swift, UIKit, Reactive Programming, MVVM, Coordinator Pattern and XCode, Mobile / Full Stack Developer May 2019 - Apr 2020 Sublime X Sydney, Remote

Developed a mobile app in Flutter and admin web site in React.js for Marine Rescue NSW. to reports marine hazards in coastal waters.

• Use of Firebase, Typescript, React Hooks, Redux, IOS and Android deployment.

• Firebase API development using Node.js and express.js. Backend image storage, connections to REST APIs, proxy for authentication, PDF generation, GCP Server configuration: Static IPs, SSL certificate, port routing, DNS Full Stack Developer Mar 2018 - Apr 2019

Saatchi & Saatchi Sydney, Australia

Built an online hearing test web app for Cochlear allowing users to assess their hearing at home. Identify new cochlear customer leads. Frontend development in React.js, Javascript, Bootstrap, Marketo REST APIs.

• Developed a Node.js, express.js REST API hosted on AWS for Toyota. JSON upload of car features and options from Toyota store kiosks. Use of Salesforce, AWS S3, lambda, EC2 and API Gateway.

• Unit and integration testing in Jest.js.

Front End Developer Feb 2017 - Jul 2017

Deloitte Sydney, Australia

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 Full Stack Developer Aug 2013 - Sep 2016

Landsberry & James Sydney, Australia

Created a web app for displaying advertising video, print and radio components and analytics for advertising campaigns. Use of JavaScript, Backbone.js, jQuery, HTML, CSS.

• Backend development using C#, .NET MVC, .NET Web API, SQL Server

• Developed an interactive web page builder linked to ad data for client presentations

• Created a web app for the Seven network to display advertisement spot pricing. Full Stack Developer May 2011 - Jun 2013

Publicis Groupe Sydney, Australia

• Developed an intranet for AIHW using Ektron CMS

• Added functionality to .NET ASP sites: Unity Water, Better Electrical, Audi, Unilever

• Use of C#, ASP.NET, .NET MVC, SQL Server, SEO, JavaScript, Backbone.js, jQuery Full Stack Developer Sep 2009 - Mar 2011

Devotion Digital Sydney, Australia

Development and maintenance of ASP.NET multiple sites: avjennings, bradfordinsulation, westfund, mfaa, clarendonhills, sydneyairportshopping. Coding in Kentico CMS and .NET C#. Updated the wool.au website using Java, J2EE, Spring and WebSphere Desktop App Developer 2000-2005

Deutsche Bank Sydney, Australia

Created a derivatives trading Windows desktop app using Microsoft MFC and C++. The system did automatic opportunity spotting and trading. Improved the productivity of DB traders around the world and generated substantial revenue for Deutsche Bank. Desktop App Developer Nov 97 - Jun 2000

STN Atas Electronic Sydney, Australia

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.

EDUCATION

Bioinformatics Graduate Certificate Sydney University Protein Function and Structure, Statistics, Sequences and Genomes, Molecular Genetics and Inheritance

Computer Science Honours Sydney University

Ray tracing of algebraic surfaces in C/UNIX, scene description language in yacc and lex.

BSc Sydney University

Computer Science and Pure Mathematics

Music

Grade 5 guitar, Grade 4 piano, Sydney University jazz ensemble ACHIEVEMENTS

• Real time visualisation of the ocean floor to establish new shipping lanes. - Atlas

• Developed a music streaming app for sharing between apple music and Spotify - Sway

• Created a mobile app to record sea conditions and warn of marine hazards - Sublime

• Developed a web based online hearing test to assess hearing - Saatchi & Saatchi INTERESTS

• Mobile development in Swift, Kotlin and Flutter

• Machine Learning and Generative AI in Python

• Computer Vision and robotics

• Audio plugin development using the JUCE framework, DSP and C++

• 3D graphics in three.js, Unreal Engine and Unity

• Embedded systems in C++ and Python

• Engineering, Entertainment, Aerospace, Automotive, Energy, Travel, Environment

• Music production and performance

• Travel, Art, Film, Music

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