Senior FIX Engineer H/F

Sigma; Basel; On-site; CHF 120,000 - 180,000; Full time

Job summary

Sigma, Basel-based financial institution, seeks a Senior FIX Engineer to join the Trading Applications team onsite in Basel. You will own FIX interfaces, connectivity and related infrastructure for the live trading environment, collaborating with traders, developers and external brokers.

The role requires banking industry experience, strong FIX protocol knowledge, and hands-on configuration, troubleshooting and integration skills. Fluency in English is essential; German is a plus.

Qualifications

• Banking domain experience is mandatory.
• Hands-on FIX protocol and interfaces experience.
• Experience with trading applications and market connectivity.
• Knowledge of TCP/IP, TLS, and Windows environments.
• Python knowledge is an advantage.
• Strong analytical and problem-solving skills.
• Fluent English; German is a plus.

Responsibilities

• Customize, configure and maintain FIX interfaces and connectivity
• Define and improve workflows related to order routing, market access and trade processing
• Implement, configure and test functionalities across trading applications and connected systems
• Troubleshoot application, interface and connectivity issues
• Support integrations between internal trading platforms and external brokers or market systems
• Analyze incidents and requirements with trading users and business stakeholders
• Handle TCP/IP connectivity, TLS and encryption topics
• Create and maintain technical documentation
• Collaborate with application, infrastructure, trading and external provider teams

Skills

FIX Protocol

Trading applications

Python

English (Fluent)

Analytical thinking

TCP/IP / TLS

Education

Bachelor's degree in Computer Science / Engineering / Natural Sciences

Job description

Senior FIX Engineer

Context

Within our IT recruitment activities, we are supporting a financial institution based in Basel in strengthening its Trading Applications team. To support the development, integration and operation of its trading environment, we are currently looking for a Senior FIX Engineer.

The position sits at the intersection of trading applications, market connectivity and technical infrastructure. It requires a strong understanding of banking and trading environments combined with hands‑on expertise in FIX connectivity.

Your Responsibilities

Your main responsibilities will include:

• Customize, configure and maintain FIX interfaces and connectivity
• Define and improve technical processes and workflows related to order routing, market access and trade processing
• Implement, configure and test new functionalities across trading applications and connected systems
• Troubleshoot application, interface and connectivity issues
• Support integrations between internal trading platforms and external brokers or market systems
• Analyse incidents and requirements together with trading users and other business stakeholders
• Handle technical topics related to TCP/IP connectivity, TLS and encryption
• Create and maintain technical documentation
• Collaborate with application, infrastructure, trading and external provider teams

Your Profile

For this position, we are looking for a profile matching the following criteria:

• Previous professional experience within a banking environment is mandatory
• Strong hands‑on experience with FIX Protocol and FIX interfaces
• Previous experience with trading applications, electronic trading or market connectivity
• Good understanding of trading processes and financial instruments such as Equities, Fixed Income, FX and/or Derivatives
• Good technical understanding of TCP/IP, TLS, encryption and Windows environments
• Experience in application configuration, integration, troubleshooting and technical support
• Around 5 years of relevant professional experience is preferred, although profiles with less experience and strong relevant expertise can be considered
• Higher education in Computer Science, Engineering, Natural Sciences or a related technical discipline
• Knowledge of Python is an advantage
• Strong analytical and problem‑solving skills with the ability to work autonomously
• Fluent English is required; German is an advantage
• Willingness to work fully onsite in Basel

What We Offer

We offer:

• A permanent opportunity within an established financial institution in Basel
• Exposure to business‑critical trading applications and market connectivity environments
• A technical position combining FIX, trading applications, connectivity and business interaction
• Collaboration with experienced specialists across trading, application management and infrastructure
• A role with significant autonomy and responsibility within the trading technology environment
• Attractive employment conditions aligned with the candidates experience and technical expertise