C++ Quant Developer

About the Role

PHNX Securities is a next-generation quantitative trading firm focused on systematic, research-driven strategies. We combine deep market understanding with robust engineering, emphasizing clean execution infrastructure, rigorous backtesting, strict risk controls, and full regulatory readiness.

We are looking for a strong C++ engineer with a passion for performance and low-latency systems to build and optimize the core trading infrastructure. This is a deeply technical engineering role focused on writing high-performance, production-grade C++ for systems where microseconds matter. You will work on order management, execution, and market data infrastructure that runs live in exchange-connected environments. A basic understanding of trading systems and market structure is expected, but elite C++ engineering is the primary demand.

Location: On-site (Hyderabad)

Type: Full-Time

Reports To: Founder

Key Responsibilities

• Design and develop ultra-low-latency trading systems in modern C++ (C++17/20)
• Build and optimize the Order Management System (OMS) — order routing, pre-trade risk checks, execution handling and fills
• Profile, benchmark, and systematically reduce end-to-end latency across application, kernel, and network layers
• Write cache-friendly, lock-free, and memory-efficient code — optimizing at the hardware level including CPU pinning, NUMA awareness, memory alignment, and cache utilization
• Work on kernel bypass and NIC-level optimizations (DPDK, Solarflare)
• Collaborate with quant researchers to productionize strategies and ensure system reliability, determinism, and correctness under real-time production conditions
• Build and maintain market data infrastructure — feed parsing, normalization, and distribution to internal consumers
• Own the full execution pipeline — from strategy signal through OMS to order on exchange

Requirements & Tech Stack

C++ Engineering

• Deep expertise in C++ (C++17/20) — lock-free data structures, concurrent programming, templates, move semantics, and RAII
• Memory management — custom allocators, memory pools, zero-copy techniques, and avoiding dynamic allocation on hot paths
• Low-latency fundamentals — CPU cache hierarchy, cache-friendly code, false sharing avoidance, memory alignment, CPU affinity, and thread pinning
• SIMD/vectorization (SSE/AVX) and shared memory IPC for zero-latency inter-process communication
• Linux systems — kernel tuning for low latency (IRQ affinity, CPU isolation, huge pages), POSIX threading, real-time scheduling (SCHED_FIFO)
• Profiling and benchmarking — perf, valgrind, flamegraphs, and the ability to systematically identify and eliminate bottlenecks

Trading & Domain Knowledge

• Strong understanding of Order Management Systems (OMS), order lifecycle, and pre-trade risk checks
• Experience with FIX protocol and/or exchange-native APIs
• Ability to consume, parse, and process high-frequency tick data (market data handling)
• Familiarity with NSE trading systems, exchange connectivity, and market microstructure

Preferred (Nice to Have)

• Exposure to time synchronization (PTP/PPS) and hardware timestamping
• Experience with tick-level simulation and backtesting infrastructure
• Knowledge of multicast market data (PIM-SM, IGMP)
• Familiarity with FPGA-based acceleration for ultra-low latency execution or market data processing

Candidate Profile

• Obsessed with performance — measures everything, assumes nothing
• Strong systems thinker who understands the full stack from hardware to application
• Disciplined and precise — in HFT, bugs are expensive
• Comfortable working in a small, high-ownership environment with direct impact on live trading
• Passionate about low-latency engineering, not just trading

Why Join PHNX Securities

• Build performance-critical systems from the ground up
• Work directly with the Founder and core trading infrastructure team
• High ownership and real impact on live trading systems
• Exposure to real exchange-connected environments and live trading
• Opportunity to shape the firm's engineering foundation