Jobs in East London, United States

Location: Remote
Salary: $5000 - $6000 Per Month

Our client is a pioneering fintech company that designs technology for financial institutions and businesses to facilitate seamless multi‑channel payment acceptance. With over two decades of innovation and millions of transactions processed globally, they are trusted as a leader in secure and scalable payment technology.

You’ll be joining a team that sits at the forefront of fintech innovation — where secure mobile payments meet embedded Android systems. This is your chance to influence the future of Android‑based POS technology across a diverse ecosystem of retail, kiosk, and forecourt environments. Expect autonomy, technical depth, and a culture that truly values engineering excellence.

As a Senior Android Developer, you’ll lead the development and integration of next‑generation POS software across a range of Android terminals, including devices from NEWPOS Tech and Elanda. Your focus will be on building secure, production‑grade Android payment solutions, ensuring compliance with the highest standards of data security and transaction integrity. You’ll collaborate closely with gateway teams, acquirers, and hardware vendors to deliver systems that are robust, scalable, and compliant with PCI DSS and EMV standards.

• Design and build modular, high‑performance Android applications in Kotlin using Clean Architecture and Jetpack components.
• Lead the design and integration of mobile payment frameworks for Android POS environments.
• Implement native integrations with SDKs for EMV, NFC, PSAM, printers, and barcode scanners.
• Develop secure, efficient native bridges for payment SDKs and third‑party libraries.

• Integrate with hardware vendor SDKs (e.g. NEWPOS Tech, Elanda, Sunmi).
• Implement EMV Level 2/3, card‑present, and contactless payment flows.
• Manage communication with peripherals (USB, RS232, Bluetooth, NFC, Ethernet).
• Support full transaction lifecycles — from initiation to settlement.

• Apply PCI DSS, EMV, P2PE, and SRED standards in design and implementation.
• Use TEE, Android Keystore, and Secure Elements for key storage.
• Implement secure session management, TLS 1.3 / mTLS, and certificate pinning.
• Participate in certification and validation processes with acquirers and processors.

• Integrate Android POS systems with cloud payment APIs and transaction services.
• Build offline‑first, idempotent transaction flows with safe retries.
• Collaborate with backend teams on API design and telemetry.
• Enable OTA updates and remote device management.

• Champion clean code, automated testing, and peer reviews.
• Mentor junior engineers and contribute to a culture of security excellence.
• Work cross‑functionally with Product, Compliance, and Security teams.
• Operate effectively in a remote, distributed engineering environment.

• 5+ years of Android development (Kotlin/Java), including 2+ years in POS or embedded systems.
• Strong understanding of Android internals, AIDL/Binder IPC, and hardware SDKs.
• Deep experience with payment SDKs, EMV, tokenisation, and acquirer integrations.
• Strong grasp of cryptography, TLS/SSL, and secure key handling.
• Proficient in CI/CD, secure signing, and regulated environments (PCI DSS / ISO 27001).

• Experience with multiple payment processors (e.g. Adyen, Fiserv, Worldline).
• Exposure to HSM/key injection workflows and terminal management systems.
• Knowledge of iOS, Flutter, or React Native (POS bridge integrations).
• Understanding of device attestation, secure boot, and IoT/Edge integration.
• Familiarity with remote device monitoring and OTA deployment.

• Fully remote and flexible working environment.
• The opportunity to shape next‑gen Android payment ecosystems.
• Work with cutting‑edge fintech hardware and security technologies.
• Competitive salary and strong technical growth opportunities.
• Collaborative, innovation‑driven culture that rewards curiosity and expertise.