Senior Software Engineer · Mobile · Web · Backend · Contractor

Senior software engineer across mobile, web, desktop and backend. I led every client of an email app used by millions, and I’m available for contract work.

Explore workStart a project

01 — Prologue

02 — Selected work

BlueMail

Lead React Native Engineer · Blix Inc. · 2024 — 2026

Every platform, end to end.

Mobile, desktop and web: I led all of BlueMail’s client work. That meant moving it from separate native apps to one React Native codebase spread over several repositories, writing the native code that makes an email app feel at home on each platform, and preparing the release builds for every store.

Visit BlueMail
  • iOS
  • Android
  • macOS
  • Windows
  • Linux
Inboxes
70M+
Play downloads
10M+
Countries
160
01

Platform migration

Led the move from separate Swift and Java apps to one shared React Native client, across several repositories.

02

Deep native integration

Swift and Kotlin wherever the product needed it: notifications, widgets, background execution and more.

03

Features end to end

Core product features from design to production, from the add-account flow to the message view.

04

Every client in step

iOS, Android, Electron desktop and the React web client, kept consistent as the product grew.

05

Architecture

Shaped how the client codebase is structured, so new features land cleanly on every platform.

06

Builds & hiring

Prepared release builds for every store and ran technical interviews for the client team.

React Native · React · TypeScript · Redux · Electron · Swift · Kotlin

03 — AI

AI in the product. Agents in the workflow.

I build AI features into products, and I build software with agents, with the engineering discipline to keep both reliable.

In the product

AI features that hold up in production.

  • LLM APIs on AWS Bedrock and OpenAI
  • AI features shipped in client products
  • TensorFlow models running in React Native

In the workflow

Agentic development, with a human in the loop.

  • Daily work with coding agents like Claude Code
  • Custom skills for review, shipping and debugging
  • Multi-agent workflows for larger changes
  • Verification before anything merges

Built with discipline. Delivered with calm.

Products for startups, a global nonprofit and teams in the field.

2024 — 2026 · Lead React Native Engineer

TypeApp

BlueMail’s sister email app at Blix, on iOS and Android. Built on the same client platform, so I carried the architecture, native modules and release builds across both apps.

React Native · iOS · Android

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2024 · Tech Lead

HAAPI

One home for rental hosts on Airbnb and Booking.com. I led a team of six through technical design and sprints, and built on React, Firebase Functions, the Hostaway API and OpenAI.

React · TypeScript · OpenAI · Firebase

H

2023 — 2024 · Full-stack Engineer

Materiality for BSR

Turns sprawling spreadsheets into one timeline of what matters to a business. Full-stack on React and Node: I set up the AWS environments, automated database archiving and shipped an LLM API on Bedrock.

AWS · React · Node.js · MySQL

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M

2023 · React Native Engineer

Fieldux

Dispatches maintenance crews to remote sites and keeps working when the signal doesn’t. Offline-first from the ground up.

React Native · Redux Offline · Keycloak

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2021 — 2023 · React Native Engineer

ChalkNotes

Story trails on a living map, with branching paths where everyone picks their own ending — and shares it everywhere.

React Native · Google Maps · Firebase

04 — At scale

5+

years shipping apps

Professional React Native since 2021

5

platforms from one codebase

iOS, Android, macOS, Windows, Linux

70M+

inboxes powered by BlueMail

10M+ downloads on Google Play alone

05 — Approach

Engineering rigor, human nuance.

1

Understand

The people, the problem and the constraints, before the first line of code.

2

Design

Architecture that fits the problem: typed, tested, and easy for the next engineer to change.

3

Ship

Releases, monitoring and the edge cases, until it holds up in production.

Mobile

  • React Native
  • Swift
  • Kotlin
  • Expo
  • Custom native modules
  • iOS & Android platform APIs

Web & desktop

  • React
  • TypeScript
  • Electron
  • Web apps

Backend

  • Node.js
  • NestJS
  • Express
  • Firebase Functions
  • API design & integrations

Cloud & data

  • AWS
  • Firebase
  • MySQL
  • Serverless
  • Database design

Engineering

  • Architecture
  • Large-scale codebases
  • Migrations & refactors
  • Offline-first
  • Performance & debugging

Builds & CI

  • GitHub Actions
  • GitLab CI
  • Build pipelines
  • Builds for every major store

AI

  • Agentic workflows
  • Claude Code
  • LLM integrations
  • AWS Bedrock
  • OpenAI
  • TensorFlow

Education

Engineering degree in Computer Science

Technical University of Cluj-Napoca

Leadership

  • Led a team of six
  • Technical design & architecture
  • Planning & delivery
  • Hiring & interviews
  • Mentoring
  • Stakeholder management

06 — Work with me

Which engagement is right for you?

Flexible contracts for startups and product teams, remote across time zones.

Build

From idea to the App Store.

  • Apps for iOS, Android, web and desktop
  • The backend and APIs behind them
  • CI/CD and release-ready builds
  • Clean handoff to your team
Enquire
Most requested

Embed

A senior engineer on your team.

  • Hands-on lead across mobile, web and backend
  • Architecture and code review
  • Build and release pipelines
  • Interviewing and mentoring
Enquire

Advise

Migrations, audits and rescues.

  • Native → React Native migrations
  • Performance and stability audits
  • Release pipeline set-up
  • A clear written plan
Enquire

“The best software disappears. People just feel that it works.”

07 — Contact

Let’s make the next one.

Tell me what you’re building, your timeline and where you’d like help. I reply within two working days.

hello@daniellaios.com