Senior Engineer for Cross-Platform System Features

@Microlent

Hello, I’ve built low-level system layers across Android, iOS, and Linux for products that rely on secure tunneling, DNS interception, and unified proxy logic. On Android, I’ve implemented VpnService/TUN stacks, tun2proxy pipelines, per-app routing, and high-performance packet handling. On iOS, I’ve delivered NEPacketTunnel-based engines with Per-App VPN, DNS proxying, and secure Keychain/MDM integration. On Linux, I’m experienced with iptables/nftables, TPROXY, eBPF, Netlink, and systemd packaging. Since your architecture already covers Windows and macOS, I can extend the same depth and consistency for the remaining platforms, ensuring identical behavior from WebView to native layers. I’m comfortable collaborating at a senior level, making unified technical decisions, and building production-grade cross-platform networking components similar to Proxifier. If you’d like, I can review your current architecture and propose the integration plan for all three platforms. Best, Jenifer

@AwaisChaudhry

Hello, I understand you’re looking for a Senior Developer to implement deep system features across Android, iOS, and Linux. You’ve got a solid architecture in place, and now it’s about adding that expert touch to ensure everything runs smoothly on all platforms. My approach will focus on creating unified technical solutions to handle VPN, DNS, and networking complexities seamlessly. By doing this, we can ensure consistent user experience across all devices while collaborating effectively with your lead developer. This will allow for a polished output, matching professional standards. Can you share more about the specific challenges you're facing with the current implementation? Thanks,

@irsolutions

With over a decade of experience in web and mobile development, I understand the complexities involved in implementing deep system features across Android, iOS, and Linux platforms. Your project requirements for a Senior Engineer are not just tasks but challenges that require real platform expertise to ensure stability and efficiency. In past projects, I have successfully delivered cross-platform solutions in fintech and blockchain domains, showcasing my ability to meet and exceed expectations. My expertise in VpnService/TUN integration for Android, Network Extension for iOS, and iptables/nftables for Linux align perfectly with your project needs. By entrusting me with this project, you can expect unified technical decision-making, consistent quality across platforms, and seamless collaboration with your lead developer. I am eager to bring my skills to the table and drive your project towards success. Don't hesitate to reach out and discuss how I can contribute to your project's success. Let's work together to create a robust and stable system that meets your requirements.

@paul612

Hi, With over 20 years of experience in the software industry, I bring a wealth of expertise in platform development, cross-platform integration, and advanced system engineering. My background aligns perfectly with the technical depth and consistency required for this role. Throughout my career, I have successfully delivered robust solutions in mobile application development, cybersecurity, and enterprise-grade systems. My experience includes working extensively with Android VpnService/TUN integration, iOS Network Extension (NEPacketTunnel and NEAppProxy), and Linux networking technologies like netfilter, nftables, and eBPF. I am adept at building unified WebView bridge layers across platforms to ensure seamless user experiences and consistent system operations. I am confident that my skills, experience, and dedication make me an ideal candidate for this position. I look forward to contributing to your innovative project and achieving outstanding results together. Sincerely, Paul

@corpmember29

HELLO, WE HAVE WORKED ON SIMILAR PROJECTS AND CAN PROVIDE EXAMPLES. Your requirements for a senior engineer who can deliver deep, cross-platform system features across Android, iOS, and Linux are fully aligned with my expertise. With 10+ years working on low-level networking stacks, TUN/TAP pipelines, proxy engines, and multi-platform system integrations, I can implement the missing layers to a production-ready standard while maintaining architectural consistency with your existing Windows/macOS core. My approach includes: • Android: VpnService/TUN integration, tun2proxy adaptation, DNS interception, per-app routing, and performance optimization. • iOS: NEPacketTunnel & NEAppProxy implementation, Per-App VPN, DNS proxying, Keychain/MDM integration, and unified WebView-native bridge. • Linux: nftables/iptables rulesets, TPROXY routing, Netlink communication, eBPF/TC pipelines, systemd services, and DEB/RPM packaging. • Cross-Platform Cohesion: shared interception logic, unified logging, consistent DNS model, and a predictable UI→native interface for all platforms. This structure keeps all platform-level decisions technically coherent and ensures smooth coordination with your lead developer. I WILL PROVIDE 2 YEAR FREE ONGING SUPPORT AND COMPLETE SOURC CODE, WE WILL WORK WITH AGILE METHODOLOGY AND WILL GIVE YOU ASSISTANCE FROM ZERO TO PUBLISHING ON STOIRES. Thanks

@Julian29

Hello!! "Senior Engineer for Cross-Platform System Features " I have similar kind of expertise and work experience. , I have gone through your requirement and understand that,you are looking for highly skilled, qualified, and experience (Android ,iphone /ipad) Mobile App with development API web services where admin can manage the app from backend development team for your project. I am available on desk as per your convenient time zone and will work on your project until you satisfied with my work. Awaiting for your positive response. Thanks Julian

@diektech

Hi — Elias from Miami. I read your brief and the goal is clear: you need a senior engineer to take ownership of the deep system layers on Android, iOS, and Linux while aligning tightly with your lead dev handling macOS/Windows. I’ve built TUN-based VPN stacks, tun2socks/tun2proxy engines, Network Extension pipelines, nftables/TPROXY flows, DNS proxies (DoH/DoT), and unified WebView ↔ native bridges for cross-platform apps. I can deliver stable, Proxifier-level quality with consistent routing logic, logging, and system behavior across all platforms. I’d handle Android (VpnService, tun pipeline, DNS, per-app routing), iOS (NEPacketTunnel, Per-App VPN, Keychain/MDM hooks), and Linux (iptables/nftables, eBPF/TC, Netlink, systemd packaging). Clean architecture, predictable performance, and a single, unified rule engine across platforms. A few focused questions: Q1: Should all platforms support dynamic rule updates from the WebView (hot reload), or only static config at launch? Q2: On Linux, do you need dual support for iptables+nftables, or can we standardize on nftables/eBPF? Q3: Any mandatory MDM providers (Intune/Jamf) for day-one support, or just a generic config interface? If this fits, I can outline a tight milestone plan and begin system audits immediately. Regards.

@softsolution2000

I am confident that my expertise in Linux, Mobile App Development, iPhone, Android, and DNS align perfectly with the requirements for the "Senior Engineer for Cross-Platform System Features" project. I am eager to work closely with your team to implement the deep system features across Android, iOS, and Linux platforms. I am open to adjusting the budget after discussing the full project scope, and my focus will be on delivering high-quality results within your budget constraints. Please review my 15 years of experience in my profile to see the quality of work I have delivered over the years. Let's discuss the job details and get started on this project. I am ready to showcase my commitment by starting tasks without being hired. Looking forward to hearing from you.

@farooqtahir2013

As a seasoned Network, Cybersecurity and System Engineer for over a decade, I have nurtured a valuable wealth of skills and experience that perfectly align with your project requirements. I possess formidable technical knowledge in Android, iOS, and Linux platforms with an outstanding understanding of the low-level system components you need to be implemented. By intimately grasping the architecture's unified cross-platform UI concept, WebView-based UI, central rule engine, proxy core, marketplace, desktop integration, my efforts will seamlessly complement our lead developer's work on macOS and Windows implementations. With me onboard, you're not just hiring a developer but someone who genuinely understands the core value proposition of your platform extending beyond mere implementation; it's about design consistency across different platforms to ensure exceptional user experience. My track record of 24/7 availability, quick response times coupled with a 100% delivery rate underscores my dedication to client satisfaction. Let's sail the seas of your project, together.

@LiveExperts

Hello, As an experienced engineer and founder of Live Experts®, I possess comprehensive skills in Android, Linux, Network Engineering, and Software Development, placing me in a unique position to excel in this project. Our strong foundation in key areas like system networking APIs, DNS handling, and performance optimization is directly applicable to your Android implementation needs. Similarly, our experiences with Network Extension (NEPacketTunnel and NEAppProxy) and Keychain integration closely align with requirements for the iOS platform. Not to mention our deep understanding of Linux's iptables, TPROXY, eBPF! I'd like to emphasize the substantial benefits of entrusting me with integrating these features across all three platforms. Beyond the necessary: 1. I can ensure harmonized technical depth and quality so that no aspects are undermined across any of the platforms. 2 My holistic approach guarantees unified decision-making across layers such as DNS handling, interception logic, logging, and proxy routing. 3. Moreover collaboration with your lead developer responsible for Windows and macOS will be seamless as there will be consistent approach from my end ! The long-term maintainability you envision requires professional insight that spans all key platforms. Not only am I capable of delivering results comparable to Proxifier but also focusing on super specialised areas bring out high quality work from us. Overall im lookng for Thanks!

@kamran2012

Hello, I will work as your senior engineer to lead the development of your cross platform communication system. I will start by designing a clear architecture that supports stable data flow between all platforms you want to connect. Then I will set up secure communication layers, handle authentication, and ensure each service can sync and exchange data without delays. I will build the backend logic in a clean and scalable way so the system stays reliable even when traffic grows. I can also integrate real time features, platform specific adjustments, and monitoring so you always know the system health. My focus will be on stability, performance, and smooth operation across all devices. If you want to extend the system later with automation, analytics, or new communication modules, I can support you anytime. Looking forward to discussing further. Regards, Kamran.

@sgrocean37

Hello, You need someone senior who can take the foundation your lead developer has built and extend it across the remaining platforms with the same standard, consistency, and discipline. This is work that only makes sense in the hands of one experienced engineer, not a mix of freelancers applying different interpretations. I'll step in, follow the architecture already defined, and build the remaining system layers so behavior, logic, and user experience stay uniform across all platforms. The focus is stability, predictability, and long-term maintainability delivered through close coordination with your lead developer and a clear, steady workflow. If this aligns with what you're aiming for, I’m ready to take full responsibility and move forward. Please let me know your thoughts. Looking forward to chat, Regards, Sagar P.

@divumanocha

Hello, I am really excited about the opportunity to collaborate with you on this project! It aligns perfectly with my skill set and experience, and I’m confident I can contribute meaningfully to your vision. I genuinely enjoy working on projects like this, and I believe we can create something both functional and visually engaging. Please feel free to check out my profile to learn more about my past work and client feedback. I’d love to connect and discuss the project details further your goals, expectations, and any specific features or ideas you have in mind. The more I understand your vision, the better I can bring it to life. I am ready to get started right away and will put my full energy and focus into delivering quality results on time. My goal is not just to complete the project, but to exceed your expectations and build a long-term working relationship. Looking forward to hearing from you soon! With regards! Divya

@ixorawebmob

Hi Marvin, Hope all is good at your end! I’ve reviewed the project details thoroughly, and I am confident in my ability to contribute effectively. With a strong background in cross-platform system development, I can implement the low-level components necessary for Android, iOS, and Linux. I believe I am the best fit for this job because: - I have extensive experience with VpnService/TUN for Android and Network Extensions for iOS, ensuring deep system feature integration. - My proficiency in Linux networking with technologies like iptables and eBPF will guarantee robust performance and stability across all platforms. - I have a proven track record in building unified WebView bridge layers that maintain consistent behavior across different environments. You can check my portfolio here: https://www.freelancer.in/u/ixorawebmob. I’d love to discuss this further and see how we can collaborate effectively. I'm available for a quick chat at your convenience. Thanks, Arpit

@Herculesz

Hi I specialize in cross-platform system-level development with deep experience across Android (VpnService, tun2socks, DNS routing), iOS (NEPacketTunnel, Per-App VPN, DNS proxying), and Linux (nftables, TPROXY, eBPF). The critical challenge here is ensuring technical parity and consistent behavior across all platforms while maintaining performance, modularity, and a unified WebView-native bridge. I bring experience building VPN layers, proxy chains, DNS interceptors, and packet routing logic using platform-native APIs, along with robust user-mode protocol handling (SOCKS, CONNECT, DoH/DoT, UDP). My approach is to implement clean, well-documented low-level integrations that can seamlessly connect to your existing UI, rule engine, and desktop logic. I’m confident working side-by-side with your lead developer to align on architecture and deliver a Proxifier-grade experience across Android, iOS, and Linux. Thanks, Hercules

@ZohaibRoy

⭐⭐⭐⭐⭐ Senior Developer for Deep System Features on Android, iOS, and Linux ❇️ Hi My Friend, I hope you are doing well. I reviewed your project needs and see you're looking for a Senior Developer to implement deep system features. You don’t need to look any further; Zohaib is here to help you! My team has successfully completed 50+ similar projects in system development. I will work closely with your lead developer to build low-level components for Android, iOS, and Linux, ensuring a robust and professional implementation. ➡️ Why Me? I can easily handle your project as I have over 5 years of experience in developing system features across Android, iOS, and Linux. My expertise includes VPN integration, network APIs, and DNS handling. I also have a strong grip on user-mode proxying and protocols, which will ensure the quality of the implementations. ➡️ Let's have a quick chat to discuss your project in detail. I can share samples of my previous work, showcasing my capabilities in system development. Looking forward to our chat. ➡️ Skills & Experience: ✅ Android Development ✅ iOS Development ✅ Linux Development ✅ VPN Integration ✅ Networking APIs ✅ DNS Handling ✅ User-Mode Proxying ✅ WebView Bridge Layers ✅ System Performance Optimization ✅ MDM Integration ✅ Package Management (DEB/RPM) ✅ Network Protocols (HTTP, SOCKS) Waiting for your response! Best Regards, Zohaib

@iosifpeterfi

You’ve built the core; I specialize in making the low‑level pieces rock‑solid across Android, iOS, and Linux. 15 years in security‑first networking (VpnService/tun2socks, Network Extension, nftables/TPROXY/eBPF), with DoD‑grade hardening and enterprise MDM experience. I’ll match Proxifier‑level stability and unify behavior across platforms. Approach - Discovery: review architecture, rule engine, proxy core, WebView bridge; align on DNS/routing/telemetry contracts. - Audit: capability matrix, entitlements/permissions, perf targets; risk register. - Build/Integrate: Android VpnService+tun2proxy, iOS NEPacketTunnel/NEAppProxy, Linux nftables+TPROXY/eBPF; unified WebView bridge. - Validate: leak tests (IPv4/IPv6/DNS), throughput/latency, battery/CPU; CI/CD, reproducible builds, code signing. - Handover: docs, packaging, MDM/Intune profiles, onboarding. Deliverables - Android: TUN pipeline, per‑app routing, DoH/DoT, UDP/QUIC, foreground service, logging. - iOS: PacketTunnel+AppProxy, Per‑App VPN, DNS proxy, Keychain, managed configs (MDM/Intune). - Linux: nftables/iptables+TPROXY, tc/eBPF marking, per‑user routing, Netlink, systemd units, DEB/RPM. - Parity: shared interception logic, DNS policy, logging schema across all platforms. Acceptance criteria - No DNS/IPv6 leaks; per‑app/per‑user routing verified. - Android ≥8, iOS ≥15, major Linux distros; survives sleep/reboot. -

@Rekhathakur

Dear Client, With WellSpring Infotech, you'll have an experienced software development partner apt for your varied cross-platform project needs. having developed different B2B and B2C products across industries including e-commerce, healthcare, fintech and real estate we understand that no two products are the same and each demands solutions fitted for their specific architecture. Each of the components you need have been previously dealt with by me or my team. We are well-versed in Android's VpnService/TUN integration, tun2proxy pipeline, system networking APIs, DNS handling, per-app routing, performance optimization. We take pride in our adeptness at working with iOS: Network Extension (NEPacketTunnel and NEAppProxy), Per-App VPN, DNS proxying, Keychain and MDM integration. Lastly but not the least we possess strong Linux skills spanning iptables, nftables, TPROXY as well as per-user routing, Netlink communication and systemd services. In summary our skillset matches all your requirements tightly allowing us to approach this project systematically without missing any details. As a startup ourselves turned a service provider in 2015 we understand your vision of growth and innovation There should be no second thoughts about our competency but let me assure you once more that I will apply the same zeal, expertise & dedication that defined us from our early days over a decade ago to get your project off the ground and to the competitive level of Proxifier!!! Thank you!!!!

@Rajoriadares

Hello Client, Greeting of the day!!!! I read your job description I have sound of five years plus experience in App development. I have been DEVELOPED 35+ Apps, three taxi apps, Two socials apps and restaurant apps based on GPS location and notification functionality and based on different domain like sports, Health, GYM, personal business and social etc I have testing team for testing apps. I think I am strongest person for doing this job and provide the quality product with testing. I am always available for your support. Thanks Sr. Mobile Developer