{"id":3159594,"url":"https://alion.io/job/concentric-staff-software-engineer","title":"Staff Software Engineer","company":{"id":1344,"name":"Concentric","domain":"concentricmarket.com","url":"https://alion.io/company/concentric","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":"staff","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Bengaluru, India","Kolkata, India","Pune, India"],"countries":["IN"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":32000,"max_usd":79000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":26},"experience_years_min":6,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"DNS","optional":false},{"name":"Objective-C","optional":false},{"name":"VPN","optional":false},{"name":"Windows","optional":false},{"name":"Cloudflare","optional":true},{"name":"DLP","optional":true},{"name":"Zero Trust","optional":true},{"name":"Zscaler","optional":true}],"status":"live","first_seen_at":"2026-10-23T15:35:27Z","employer_posted_date":null,"last_verified_at":"2026-10-23T15:35:27Z","board_verified":false,"closed_at":null,"days_open":5,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":5},"description":"Responsibilities: \nDesign and implement transparent network traffic interception on macOS using Apple's Network Extension framework.\nBuild selective traffic redirection for AI applications while minimising impact on non-managed network traffic.\nDesign and implement communication between the Network Extension and the endpoint service responsible for proxy coordination, authentication, and policy management.\nArchitect traffic steering mechanisms that securely redirect eligible traffic to the cloud inspection platform.\nDesign resilient handling of application launches, network changes, sleep/wake cycles, interface changes, captive portals, and roaming scenarios.\nEnsure seamless coexistence with enterprise VPN clients, SASE agents, endpoint security products, and other Network Extension-based software.\nInvestigate and resolve interoperability issues involving routing, DNS, proxy configuration, packet processing, and competing network extensions.\nDesign mechanisms for selectively intercepting traffic before enterprise proxy or SASE products when appropriate while maintaining compatibility with enterprise networking policies.\nOptimise CPU utilisation, memory footprint, connection latency, and startup performance for enterprise laptop deployments.\nBuild comprehensive diagnostics, health monitoring, and troubleshooting capabilities for complex customer environments.\nCollaborate closely with endpoint service, cloud platform, security, Windows, and backend engineering teams to define clean APIs and system contracts.\nParticipate in customer escalations involving networking interoperability and complex enterprise deployments.\nMentor engineers and help define the long-term macOS networking architecture.\n\nRequirements: \n6+ years (Senior) / 9+ years (Staff) of professional software engineering experience.\nExtensive hands-on experience building production software using Apple's Network Extension framework.\nProven experience shipping enterprise networking products on macOS.\nDeep understanding of Network Extension providers, transparent proxy architectures, packet flow, DNS handling, and network routing.\nStrong understanding of the macOS networking stack, including interface management, routing, DNS resolution, TLS, and proxy behaviour.\nExperience diagnosing complex interoperability issues involving VPN clients, proxy software, endpoint security agents, and other network extensions.\nStrong systems programming skills in Swift, Objective-C, or C/C++, with the ability to work across language boundaries where appropriate.\nExperience building highly reliable background services and privileged system components.\nStrong debugging skills using macOS networking diagnostics, packet captures, system logs, and performance analysis tools.\nExcellent communication skills and the ability to collaborate across multiple engineering teams.\nStrongly Preferred Experience building endpoint security products such as: Endpoint DLP, EDR/XDR o Secure Web Gateway (SWG), SASE endpoint client o VPN client, Zero Trust Network Access (ZTNA) client, Endpoint Firewall.\nDeep experience with: Transparent Proxy Provider, Packet Tunnel Provider, App Proxy Provider, Network Filter Provider, System Extensions, Endpoint Security Framework (ESF).\nExperience integrating with enterprise identity and device management platforms.\nExperience designing networking software that coexists with products from vendors such as Zscaler, Palo Alto Networks, Netskope, Cisco, Microsoft, Cloudflare, or similar enterprise networking platforms.\nFamiliarity with enterprise certificate management, proxy authentication, TLS interception, and trust distribution.\nExperience supporting large enterprise deployments managed through Jamf, Intune, Kandji, or similar MDM platforms.\nSkills\nC++, Network Extension, Objective-C, Swift, System Extensions, 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