Senior Android Engineer

Role Description

Type: Full-Time, Remote (6-month contractual job with possibility of extension)

• Required Skills:
• Android
• Kotlin, coroutines/Flow, modern Android architecture
• VpnService: building and managing a VPN tunnel, routing, DNS handling, per-app VPN, always-on VPN behaviour.
• TUN interface concepts: packet capture/forwarding, MTU, TCP/UDP basics as they apply to tunnelling.
• Strong networking fundamentals: TCP/UDP, TLS, DNS, proxies, NAT concepts, latency/packet loss handling.
• NDK/JNI experience (C/C++) for integrating VPN cores (strongly preferred)
• Release hardening: R8/Proguard, crash/ANR monitoring, Play Console workflows
• Building and shipping native libraries for multiple ABIs (arm64-v8a, armeabi-v7a).
• Experience with Gradle/CMake native builds.
• Protocols:
• WireGuard (keypairs, allowed-ips, handshake/keepalive behaviour)
• OpenVPN (TLS, config formats, cypher suites, connection stability)
• IKEv2/IPsec (EAP/TLS or PSK auth options, MOBIKE, NAT-T), strongSwan
• Shadowsocks / custom tunnelling (optional)
• Security & privacy:
• Android Keystore, secure storage, encryption, certificate handling/pinning where appropriate
• Threat modelling, least-privilege design, privacy-first telemetry
• Others:
• Prior VPN product experience (consumer or enterprise)
• Play policy experience for VPN apps
• Experience building “core VPN SDK + app shell” architecture
• Backend/DevOps (Optional):
• One backend stack: Go/Java/Node/Python + PostgreSQL (or equivalent)
• Secure API design, secrets management (KMS/Vault), rate limiting
• Linux networking: iptables/nftables, routing, sysctl tuning
• Infra-as-code and CI/CD; monitoring (Prometheus/Grafana), centralized logs
• Deliverables/success metrics:
• Stable connections across protocols, minimal battery impact
• No DNS/IP leaks in standard test suites
• (Nice to have) Automated provisioning pipeline for servers and user/device configs
• (Nice to have) Monitoring dashboards + alerting; documented runbooks

Qualifications

• Experience with Android development
• Proficiency in Kotlin and modern Android architecture
• Strong understanding of networking fundamentals
• Experience with VPN technologies and protocols

Requirements

• Prior experience in VPN product development
• Familiarity with Play policy for VPN apps
• Experience with backend technologies (optional)

Benefits

• Remote work flexibility
• Opportunity for contract extension

Company Description

Founded in 2013, Fusemachines is a global provider of enterprise AI products and services, on a mission to democratize AI. Leveraging proprietary AI Studio and AI Engines, the company helps drive clients’ AI Enterprise Transformation, regardless of where they are in their Digital AI journeys. With offices in North America, Asia, and Latin America, Fusemachines provides a suite of enterprise AI offerings and specialty services that allow organizations of any size to implement and scale AI. Fusemachines serves companies in industries such as retail, manufacturing, and government.

Fusemachines continues to actively pursue the mission of democratizing AI for the masses by providing high-quality AI education in underserved communities and helping organizations achieve their full potential with AI.