Resume ↓

Tonis Tiganik

Software engineer with 12+ years of Kotlin and Typescript experience. I can create Kotlin backend and data streaming apps, Typescript full stack apps and also Android apps.

Contact information

📧 tonisives@gmail.com | 🐱 Github | 🔗 LinkedIn | 🌏 tonisives.com

Experience

High-Mobility, Remote – August 2018 – Present

Backend engineer, Data streaming engineer.

We worked in small teams to transfer knowledge about system requirements/architecture. My job was to understand project requirements, implement and release services to production.

Ford car data streaming service

Implemented a service that streams data from thousands of Ford vehicles

• Uses Ford SDK to stream data via gRPC and then forward it to Kafka.
• Horizontal scaling with the Ford’s sharding feature and in-house kubernetes
• Fault tolerance with checkpointing in DynamoDB
• Grafana dashboard for monitoring and Sentry for error handling.

Kinesis data sink

Implemented a data sink solution for any number of Kinesis streams

• Each pod publishes to multiple kinesis streams in parallel(configurable)
• Horizontal scaling by partitioning data by vehicle id
• AWS Lambda function to allow customer registration. Deployed with Terraform CDK
• Robust load/fault-injection tests for smooth integration

PSA car data streaming service

Implemented a service that streams data from thousands of PSA(Peugeot, Opel, etc) vehicles

• Data is read from AWS Kinesis and forwarded to internal Kafka
• Horizontal scaling by checkpointing Kinesis in DynamoDB
• Grafana dashboard for monitoring and Sentry error handling

Connected car backend system

Developed a backend system for vehicle data management using Kotlin, implementing MQTT communication and PostgreSQL database integration.

• Built RESTful services for car owner access management
• Implemented hierarchical data structure: User -> Connection -> Car -> Data
• Integrated MQTT protocol for real-time vehicle data streaming
• Developed secure authentication and authorization mechanisms (OAuth with OTP login)
• Built an Android to proprietary data conversion service

We test all services for smooth integration

• 95+% unit tests.
• load/fault-injection test for all edge cases
• We use CI to deploy to Kubernetes via Github actions.

High-Mobility, Remote – August 2014 – August 2018

Android Developer

Android Automotive Data Observing App

Built an app that reads car data from the real vehicle, and uploads it to the server via MQTT

• Jetpack Compose UI with LiveData
• Reads Android Automotive Data via the CarPropertyManager
• Uploads data via MQTT/Bluetooth
• Android Automotive research, including OEM signing, custom firmwares

Bluetooth Auto API Explorer

• A sample app that shows a possible use case for HMKit Android.
• We connect to a vehicle/emulator via BLE/Telematics and send some commands like lock doors and turn on lights.
• Mainly showcases how you can integrate hmkit-android into a customer’s codebase

Open Source Contributions

Developed and supported Kotlin/Java libraries that were used by company clients.

• hmkit-android Uses bluetooth/telematics to connect to vehicles. Clients can add this to their own apps
• hmkit-fleet Used for clients to authenticate and connect to cars via High-Mobility platform remotely
• bluetooth-auto-api explorer Customers can test out their vehicle connection

Cannedapps, Tallinn – 2011 – August 2014 (3 years)

iOS Software Engineer

• Developing Jaguar Land Rover+Fiat iOS apps. These apps use telematics to send/receive data from cars
  • Used Swift to create complex views with navigation logic
  • Also Custom views for the Car brand
  • Polling of the Car command data
• Concepts of Car dashboard apps in Android tablet.
• Weather forecast app for Android

Yrgel Entertainment Internship, Tallinn – January 2011 – May 2011 (5 months)

Intern

• Android/iOS native application development and Mobile game development with Unity3D.

Hobby projects

Audit-Hero – August 2022 – November 2024

• A web app that aggregates Security Audit reports: live website

• NodeJS Backend Development: Used serverless stack with AWS Lambda and DynamoDB. Lambdas are managed through a NGINX proxy.

• Frontend ReactJS development: Developed responsive user interfaces with ReactJS. Used MaterialUI for modern UI elements, hooks/zustand for state store.

• Micro frontends Used Module federation to separate deployment of different sub-pages

• Terraform deployment All services are automatically deployed via Terraform’s CDKTF library.

• Functional Programming: Implemented functional programming concepts using the fp-ts library to build clean, maintainable, and scalable code bases.

• Main functionality

  • Content Aggregation: cron jobs parse APIs and websites, utilizing sophisticated regex pattern matching for effective text parsing.
  • Embeddings Matching: Uses Qdrant DB for embedding storage and LLM for rule creation and verification, effectively matching previous findings with current project code.
  • Code Static Analysis: Implemented static analysis with solidity-parser ANTLR, generating call trees and projecting them using mermaidJS for in-depth auditing insights.
  • SAAS product: Includes payments integration with Stripe/Crypto. Users can buy in-app tokens to spend it on LLM queries.

Knowledge Token NFT project August 2022

• Frontend is written in ReactJS, contracts in Solidity.
• The project allows writers to create NFT-s that readers can mint. Majority of mint fees go to the author, and some to the project.
• Backend is in Solidity and AWS Lambda/DynamoDB

DEX Aggregator on Terra Luna. August 2021

• The node.js AWS lambda function loads price info from token pool contracts.
• React front end shows the price graphs and there is a price alerts function.
• Node.js lambda function checks the alerts info and sends email alerts.
• Users can swap tokens in the liquidity pools directly on the website

Open Source contributions

• Security Audit Contributions: Actively participated in Solidity security audits, finding high level vulnerabilities and gaining deep knowledge of EVM and frameworks like Foundry and Hardhat. Includes multiple projects about defi, NFT-s and L2-s.
• Open source contributions I contributed with PR-s to the langchain(1, 2) and Chroma vector db (1, 2) projects.

ti-vim

• MacOS system-wide Vim mode. Uses Swift in the app, and a Lambda function that validates the app purchase. link

Dig Three

• Dig Three: Digging game for iOS, made with Unity.

Education

Bachelor’s Degree in IT Systems Development, 2007

Estonian IT College – Tallinn, Estonia

Other

• Languages: English(fluent) | Estonian(native) | Thai(mid-level)