Full Stack Product Engineer

Sadapay Private Limited; United States; Remote; USD 9,400 - 14,000; Full time

Job summary

SadaPay is seeking a Senior Backend Engineer to own customer-facing product slices across backend services and mobile interfaces. The role is backend-anchored yet full stack, enabling product decisions and end-to-end delivery within a compact, high-leverage team.

Ideal candidates have strong Kotlin/Spring experience, the ability to span backend, web tooling, and mobile code, and are comfortable using AI tools to boost coding and review efficiency. Remote work is supported with Karachi preference.

Qualifications

• Senior backend engineering experience with Kotlin and Spring.
• Ability to work across backend services, web tooling, and mobile codebases.
• Experience using AI development tools in the coding workflow.

Responsibilities

• Take features from Kotlin/Spring services through admin interfaces into the customer mobile experience.
• Build reliable backend services within a shared service monorepo.
• Extend Next.js control modules and integrate into a Flutter application.
• Own all technical layers for a product slice from backend to frontend and mobile.
• Utilize AI coding agents (Claude or Cursor) in implementation and review as part of workflow.
• Make scope and product trade-offs, maintain quality via reviews, RFCs, ADRs, and AI-assisted checks.

Skills

Kotlin

Spring

JVM

Tools

Next.js

Flutter

JVM

Job description

Full Stack Pakistan; Karachi preferred, remote considered

Job details

Senior Experience

Not specified Employment

Role overview

This senior product engineering role owns customer-facing product slices from backend services through operational tooling and mobile interfaces. The work is backend-anchored but deliberately full stack: engineers make product decisions, collaborate across technical layers, and ship complete outcomes in a small, high-leverage team.

Responsibilities

• Take features from Kotlin/Spring services through administrative or operations interfaces and into the customer mobile experience.
• Build clean, reliable, correctness-critical backend services within a shared service monorepo.
• Extend Next.js control modules and integrate required functionality into a Flutter application.
• Own every technical layer needed for a product slice instead of handing work between separate backend, web, and mobile teams.
• Use AI coding agents such as Claude or Cursor for implementation, review, and delivery as part of the normal engineering workflow.
• Make scope and product trade-offs, keep work focused on customer outcomes, and maintain quality through code review, RFCs, ADRs, and AI-assisted checks.

Requirements

• Senior backend engineering experience, especially with Kotlin and Spring or a comparable typed/JVM technology background.
• Ability to work across backend services, web-based operational tooling, and mobile application code.
• Comfort owning ambiguous problems end to end and making practical product and technical decisions.
• Experience building reliable systems where correctness and maintainability matter.
• Willingness to use AI development tools routinely as part of coding and review.
• Strong written communication and judgment around architecture, scope, and engineering quality.

Benefits and work setup

The role is remote, with Karachi preferred and remote candidates considered. It is listed as full-time or part-time.