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Selini logoSelini

HFT C++ Core Systems Developer - 5-15 years experience

Copenhagen, Capital Region of Denmark, Denmark · On-site

Senior+

Core C++ Developer – Crypto High-Frequency Trading About Selini: Selini is a global trading firm focused on systematic trading and venture investing. Overview We are seeking an exceptional Core C++ Developer to contribut…

Skills: C++, Low-latency Systems, Systems Programming, High-performance Computing, TCP/UDP

Selini logo

HFT C++ Core Systems Developer - 5-15 years experience

Selini

Copenhagen, Capital Region of Denmark, Denmark • On-site

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Senior+

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  • Full-time
  • Competitive Compensation, Holiday Allowance, Free Daily Deliveroo Lunch, High-spec Office and Technology, Team Socials, Global Company Offsites
  • Posted 11d ago
  • ~40 hrs/week

Responsibilities

Design and optimize ultra-low-latency trading infrastructure and scalable algorithms using modern C++. Collaborate with quants and traders to minimize latency and ensure robust, fault-tolerant system operations.

Requirements

Expert-level proficiency in modern C++ (C++17/20/23/26) and extensive experience in Linux-based high-performance systems programming. Background in crypto or traditional finance trading systems is required.

Full job description

Core C++ Developer – Crypto High-Frequency Trading

About Selini:

Selini is a global trading firm focused on systematic trading and venture investing. 

Overview

We are seeking an exceptional Core C++ Developer to contribute to the development and optimization of our high-performance trading systems. This role focuses on building ultra-low-latency infrastructure, optimizing execution speed, and ensuring robust system reliability. The ideal candidate will have deep expertise in modern C/C++, systems programming, and high-performance computing.

Key Responsibilities

  • Design, develop, and optimize low-latency, high-performance trading infrastructure in modern C/C++ (latest standards).
  • Implement efficient and scalable trading algorithms, order execution, and risk management systems.
  • Deep understanding of exchange connectivity standards for market data and order entry
  • Optimize CPU performance, memory management, and multi-threaded applications.
  • Collaborate with quant researchers, traders, and infrastructure engineers to improve system performance.
  • Profile, benchmark, and debug real-time systems to minimize latency and maximize throughput.
  • Maintain robust and fault-tolerant system components for continuous trading operations.

Required Qualifications

  • Expert-level proficiency in C++, with a strong grasp of modern C++ features (C++17/20/23/26).
  • Extensive experience in low-latency, high-performance systems programming.
  • Deep understanding of networking (TCP/UDP), concurrency, and multi-threading.
  • Strong experience in Linux-based development and performance tuning.
  • Experience with real-time, high-throughput systems where performance is critical.
  • Background in crypto or traditional finance trading systems

Soft Skills & Culture Fit

  • Candidates with exceptional academic or industry backgrounds.
  • Strong analytical skills and ability to work in high-pressure, real-time environments.
  • Collaborative team player who enjoys solving complex engineering problems.

We’re a close-knit team that values:

  • High ownership and initiative
  • Curiosity, intellectual honesty, and rapid learning
  • Clear, direct communication
  • Working together toward shared goals — no ego, no politics

Compensation & Benefits:

  • Very competitive compensation, with strong upside based on contribution and performance
  • Competitive holiday allowance 
  • Free daily Deliveroo lunch
  • High-spec office and technology
  • Team socials
  • Global company offsites and development opportunities

 

Related keywords

C++HFTCryptoLow-latencyHigh-performance ComputingTCPUDPLinuxMulti-threadingConcurrencyMarket DataOrder EntrySystematic TradingRisk ManagementC++17C++20

About Selini

LinkedInVisit site

Digital Assets trading and investments firm

Industry
Financial Services
Company size
51-200 employees
Founded
2021
LinkedIn followers
3,021

Digital Assets Investing and Algorithmic Trading Firm

CryptocurrencyTrading PlatformFinTechFinancial Services
View all jobs at Selini

About Selini

LinkedInVisit site

Digital Assets trading and investments firm

Industry
Financial Services
Company size
51-200 employees
Founded
2021
LinkedIn followers
3,021

Digital Assets Investing and Algorithmic Trading Firm

CryptocurrencyTrading PlatformFinTechFinancial Services
View all jobs at Selini

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