Tomi
Jokinen
Software Engineer
Mobile specialist · Web & APIs · AI systems
Software engineer with deep production experience in mobile applications and a broad interest in systems, platforms, and emerging AI-native products. I enjoy working across layers of a product stack, learning new technologies quickly, and building practical software that ships.
Projects
Production mobile apps on global stores, hackathon builds—agent-native payments on Arc, on-prem agentic diagnostics—and open-source Android tooling: a resilience-first BLE library and a Gradle plugin for binary compatibility validation.
Navimo
Production mobile app for purchasing and managing travel eSIMs, providing connectivity in 200+ destinations worldwide.
Key Contributions
- Led Android app development from scratch using Kotlin and Jetpack Compose
- Participated in the full app development lifecycle across both Android and iOS
- Contributed to iOS development using Swift and SwiftUI in collaboration with the iOS team
- Built core flows for purchasing, installing, and managing travel eSIMs
TravelWifi
Production mobile app for managing data plans for portable hotspots and purchasing eSIMs, used by customers worldwide.
Key Contributions
- Led development of the Android app from scratch during a React Native → native migration
- Developed and maintained features across both Android and iOS, owning the full release and publishing pipeline
- Introduced Datadog RUM and reduced per-session error rate from ~5% to near zero
Cairn
Nanopayment oracle for sensor networks (Arc)
Winner · LabLab.ai — Agentic Economy on Arc
Hackathon-winning nanopayment oracle network for community environmental sensors on Circle Arc: operators expose x402-gated readings and earn USDC per query; autonomous agents pay nanopayments (EIP-3009 via Circle) for verified data. Includes Solidity contracts (Foundry), TypeScript aggregator and operator services, insurance-style demo agent, and a React dashboard.
Highlights
- Full HTTP 402 → authorize → settle loop across aggregator and sensor operators using x402
- On-chain registries, attestations, reputation, and slashing; quorum verification with MAD outlier rejection
- React dashboard + WebSocket backend for live maps, streams, and scripted adversarial demos
LHADA
Lunar Habitat Anomaly Diagnosis Agent
AMD Developer Cloud Hackathon 2026 · AI Agents track
Agentic diagnostics over real EDEN ISS greenhouse telemetry (replay-as-lunar-scenario): DAMP matrix-profile and threshold detectors raise events; a tool-calling LLM investigates against a citation-backed failure-mode KB and emits structured diagnoses with full reasoning traces. FastAPI + WebSockets backend and Gradio UI; Hugging Face Space for offline replay.
Highlights
- Swap-in telemetry sources and anomaly scenarios behind stable AsyncIO/WebSocket interfaces
- KB-grounded hypotheses with NASA/ESA literature citations — no embedding-retrieval shortcuts
- End-to-end trace streaming for dashboards and judges (tool calls, detector fires, final diagnosis)
blease
Resilience-first Android BLE library
Open Source · Kotlin
Android coroutines/Flow BLE library that mitigates GATT error 133 correctly by default and ships a scriptable fake transport as a published artifact, so apps can unit-test their BLE logic without hardware.
Highlights
- GATT 133 mitigation by default: serialized GATT operations, explicit close on every non-connected transition, capped jittered exponential backoff
- Published :blease-test fake transport for hardware-free, millisecond-fast BLE unit tests with runTest and Turbine
- At-most-once writes by default and a sealed BleResult error model, with connection death exposed as StateFlow state
- Public API tracked with committed ABI dumps; verified against real hardware
android-bcv-bridge
Gradle plugin bridging BCV and AGP 9 built-in Kotlin
Open Source · Gradle Plugin Portal
Gradle plugin that restores the Kotlin Binary Compatibility Validator's apiDump/apiCheck tasks for Android library modules built with AGP 9 built-in Kotlin, where BCV silently registers no tasks.
Highlights
- Registers BCV's own task types directly against the compiled classes of AGP built-in Kotlin — no standalone Kotlin plugin required
- Wires apiCheck into check so CI fails on any binary-incompatible public API change
- Verified end-to-end by a TestKit functional test running with the configuration cache enabled
- Published on the Gradle Plugin Portal as a stopgap until KGP's built-in ABI validation supports Android (KT-78025)
Core Stack
Heaviest day-to-day depth on mobile (Kotlin, Swift, Jetpack Compose, SwiftUI, React Native). I also use React, Next.js, and TypeScript for web and shared product surfaces—this site is Next.js.
Experience
Senior Software Engineer (Mobile)
TravelWifi
- ◆Owned the end-to-end mobile development lifecycle for Android and iOS applications, from requirements gathering and technical design to implementation, release, monitoring, and ongoing maintenance.
- ◆Designed application architecture and UX flows, and architected a modular white-label Android app using Jetpack Compose to enable flexible client-specific customization.
- ◆Led the technical design and implementation of in-app eSIM provisioning on Android, integrating with the Android Telephony API and EuiccManager, including carrier app privilege management for specific eSIMs based on their ARF.
- ◆Designed and implemented comprehensive MiFi device management features, enabling eSIM download, installation, removal, switching, and profile management via WiFi and Bluetooth connections.
- ◆Collaborated closely with product, design, and backend teams throughout discovery, development, and delivery phases to ensure scalable, secure, and maintainable solutions.
- ◆Established and followed modern development workflows, including code reviews, CI pipelines, version control, and release processes to ensure high-quality and reliable deployments.
- ◆Owned production releases and post-release operations, including publishing to Google Play and the App Store, monitoring crashes and performance, and delivering regular updates and improvements.
Relevant Skills: React Native, Kotlin, Jetpack Compose, Material Design, Hilt, Dagger, Retrofit, Swift, SwiftUI, Firebase, Crashlytics, DataDog, Android Telephony / EuiccManager, Human Interface Guidelines, App Store, Google Play
Frontend & Mobile Engineer
Freelance
- ◆Developed web and mobile applications for startups and small businesses using React and React Native across iOS and Android platforms.
- ◆Designed UI-rich, responsive interfaces and implemented client-facing features by translating business requirements into technical solutions.
Relevant Skills: React, React Native, JavaScript, TypeScript, REST APIs, Firebase, Git
AI Training & Data Analyst
Telus International AI Data Solutions
- ◆Supported AI training and evaluation initiatives across speech recognition, voice assistants, search quality, Large Language Models (LLMs), and multimodal (text, audio, vision) annotation workflows.
- ◆Contributed to human-feedback and quality loops (including RLHF-style tasks) to improve model behavior, dataset usefulness, and evaluator consistency.
- ◆Applied quality assurance practices to raise training efficiency, reduce error rates in labeled data, and tighten feedback cycles with program guidelines.
Education
M.Sc. in Computing Sciences(coursework completed)
Tampere University
- ◆Database establishing, modeling, design, SQL queries.
- ◆Data Structures and Algorithms.
- ◆Programming: C, Java, JavaScript, Python.
- ◆Full Stack Web Development.
- ◆Software Production.
- ◆Artificial Intelligence, Machine Learning.
- ◆Cybersecurity.
Bachelor of Business Administration
Seinäjoki University of Applied Sciences
- ◆International Business
Certifications & Courses
AWS AI & ML Practitioner Challenge
Udacity / AWS
Completed the AWS-sponsored AI and ML practitioner curriculum on Udacity (foundation for AWS ML literacy). Working toward the AWS AI Agent Developer Nanodegree; certification exam targeted July 2026.
Winner — Cairn (Agentic Economy on Arc)
LabLab.ai
Winner with Cairn at Agentic Economy on Arc — Circle Arc settlement, x402 APIs, and agent-facing nanopayments for verified sensor readings. Story and links under Portfolio → Projects.
Create Serverless Applications
Microsoft / Coursera
This course is a part of Microsoft Azure Developer Associate (AZ-204) Professional Certificate. Azure Function development, deployment and testing. Evaluating Azure services for integration and process automation scenarios.
Kotlin Core
Hyperskill / JetBrains Academy
Kotlin syntax, application design with functional decomposition, key programming concepts, OOP decomposition, Java and Kotlin libraries
React (Basic) Certification
HackerRank
React (Basic) covers topics like Basic Routing, Rendering Elements, State Management (Internal Component State), Handling Events, ES6 and JavaScript and Form Validation.
CSS Certification
HackerRank
Cascading and Inheritance, text styling fundamentals, layouts, boxing of elements.
Machine Learning with Python
Aalto University
Introduction to machine learning concepts and implementation using Python.
Full Stack Web Development
University of Helsinki
Comprehensive course covering MongoDB, Express, React, and Node.js.
Advanced Programming
University of Helsinki
Advanced concepts in Java programming and software development.
Languages
Finnish
Native
English
Fluent
Spanish
Fluent
Get in Touch
I'm always open to discussing new projects, ideas or opportunities to work together.