Hi, I'm

Esther Sanusi

Senior Software Engineer — Android · iOS · Windows · macOS

I build technology that works.

6+ years. 20+ live apps. 10M+ people reached — across Android, iOS, Windows, and macOS, in fintech, legal tech, and civic tech. I grew from Android engineer to software engineer by shipping whatever the product needed. Now I'm folding data science and AI into that craft — not a side path, but how I build genuinely smarter products. Mastery is the point.

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Esther Sanusi, Senior Software Engineer
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These are products I've actually shipped — fintech serving millions, legal tech used by courts, civic tech in citizens' hands. Tap any icon to open it inside the phone.

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Esther Sanusi
Hi, I'm Esther 👋 Senior Software Engineer Available for work

Career

Experience

  1. FairMoney

    Mar 2025 – Present

    Software Engineer, Android · Lagos (Remote)

    Nigeria's leading digital bank, 10M+ downloads. Building and maintaining savings features with KMP + Compose Multiplatform.

    • Owned the FairDollar home screen + Help & remote-config FAQs (new USD savings product, 2025)
    • Migrated 3 existing modules to KMP (2025); building Fairlock pre-liquidation & migrating SaversClub to KMP (2026)
    • Optimized CleverTap (events + bots) and Customer.io analytics
    • Hardened reliability — fixed flaky tests, added missing unit & UI tests

  2. Lawpavilion

    Jul 2020 – Mar 2025

    Senior Software Engineer / Team Lead · Lagos (Remote)

    Led mobile across Lawpavilion's legal-tech suite for ~4 years. With no bandwidth to hire, I bridged the gap — which grew me from an Android engineer into a software engineer shipping across mobile and desktop.

    • Lawpavilion Prime (native Android): co-led the Java→Kotlin migration (15K+ lines, −80% NPEs, crash 4.2% → 0.8%)
    • Built My Research, all GPT features and LPInsight; optimized Lucene search across 2021→2025 case data (relevance +60%)
    • Led 5 Flutter products — Elite, Elite Admin, MOJ, CJRP, CourtAI — with remote-config-driven links & content
    • Built code-review culture (−40% prod bugs), cut releases 2 days → 4 hours, mentored juniors

  3. Frontendlabs Ltd

    Apr 2021 – Aug 2022

    Software Engineer / Team Lead (Contract) · London (Remote)

    Agency work — led a team building internal, non-disclosed products and client apps.

    • Led a team of 5; production apps with Kotlin & KMP
    • GraphQL client architecture
    • Multiple internal (NDA) apps + a community/church app

  4. HNG Internship

    Sep 2019 – Nov 2019

    Android Developer Intern · Remote

    Built Android apps as program tasks — including KidStories, Car Park, and others.

  5. She Code Africa

    Jan 2020 – Apr 2020

    Mentee · Android track

    Community-driven program that built my foundations in Android engineering — and where I first beat imposter syndrome.

Mobile

KotlinJavaDartJetpack ComposeKMPCompose MultiplatformFlutter

Architecture

MVVMMVIClean ArchitectureHiltKoin

Async

CoroutinesFlowRxJava

Data

RoomSQLDelightFirebaseDataStore

API

RESTGraphQLKtorRetrofitWebSockets

Quality

TDDRobolectricUI / Instrumentation testsGitLab CIGitHub Actions

Now

Deepening the craft

I'm folding data science and AI into the engineering I already do — not as a separate track, but to make the products I build sharper and more intelligent. It's how I pursue mastery: widening the craft, never abandoning it.

What I do

How we can work together

Mobile Engineering

Android, KMP, and Flutter apps built for scale — clean architecture, real reliability metrics, and a release process that doesn't fight you.

Technical Writing & Content

Engineering articles, tutorials, and developer-brand collaborations that explain hard mobile problems clearly — backed by shipped work.

Consulting & Mentorship

KMP migration strategy, mobile architecture reviews, and team mentoring — turning legacy Android into something your team is glad to maintain.

From the desk

Writing & Thoughts

In the open

Open Source & Activity

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Credentials

Certificates

Social proof

What people say

Contact

Let's work together.

Full-time roles, freelance builds, collaborations, or a talk — tell me what you're making and I'll reply within a day.