Senior Mobile Engineer (Flutter/Dart, GraphQL) – Hybrid

Kpler; Greater London; Hybrid; GBP 60,000 - 77,000; Full time

Job summary

Kpler, based in London, is seeking a Senior Mobile Engineer to build and ship complex Flutter/Dart features for MarineTraffic and Kpler apps. You will design the mobile BFF stack (Node.js, TS, GraphQL, PostgreSQL/PostGIS) and ensure high performance, accessibility, and Clean Architecture across platforms.

You will participate in product and UX decisions with PMs and designers, mentor peers, and contribute to platform-wide engineering practices in a hybrid, collaborative environment.

Qualifications

• Strong experience building and shipping consumer (B2C) mobile applications at scale, serving over a million users.

Responsibilities

• Develop production-ready features for the MarineTraffic and Kpler apps, upholding Clean Architecture standards and translating platform conventions into polished, native‑feeling experiences.
• Design and evolve the mobile BFF (Node.js, TypeScript, GraphQL, PostgreSQL/PostGIS) as a primary, scalable component serving all mobile needs.
• Act as a quality guardian through code reviews, automated test suites, observability, and continuously improved CI/CD and engineering practices.
• Contribute to product and UX decisions alongside the PM and Designer, owning outcomes rather than just code.
• Maintain and optimise the AI/LLM tooling stack so agents write code autonomously to the teams standards.
• Mentor peers, contribute to the Front‑end Chapter, and support business teams autonomy over their functional scopes as part of the crews platformisation strategy.

Skills

Mobile development

Flutter

Dart

Node.js

TypeScript

GraphQL

Clean Architecture

UX collaboration

Tools

Node.js

TypeScript

GraphQL

Flutter

Dart

PostgreSQL

PostGIS

Mapbox

Kafka

Airflow

Job description

Kpler, based in London, is seeking a Senior Mobile Engineer to build and ship complex Flutter/Dart features for MarineTraffic and Kpler apps. You will design the mobile BFF stack (Node.js, TS, GraphQL, PostgreSQL/PostGIS) and ensure high performance, accessibility, and Clean Architecture across platforms.

You will participate in product and UX decisions with PMs and designers, mentor peers, and contribute to platform-wide engineering practices in a hybrid, collaborative environment.