C++ Senior Software Engineer – Fully Remote
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At a glance
- Employment type
- Contract
- Location
- Ireland · Remote within Ireland
- Workplace
- Remote
- Category
- Full-stack
What you'll be doing
Senior C++ Engineer (contract, fully remote, Ireland) for a global fintech. Join a lean team to architect and build high-throughput, low-latency C++ applications powering international payments. Focus on greenfield development, high-concurrency systems, REST APIs, and SQL. 6+ years' experience required.
- Design, implement, and maintain high-throughput, low-latency C++ applications for international payment flows
- Drive new backend capabilities across C++, Golang, PHP, and HTML to expand financial accessibility
- Take full technical ownership of complex features from design and multi-threaded implementation through to testing and deployment
- Collaborate with senior developers, support engineers, and global technology partners to ensure reliability and performance
Key requirements
Must-have
- 6+ years of software engineering experience in production C++ environments
- Deep technical depth in multi-threaded programming and high-concurrency systems architecture
- Strong mastery of REST API design principles and microservices integration
- Hands-on experience with relational databases and performance-tuned SQL
Experience: 6+ years
Role signals
- Technical focus
- full-stack
- Architecture / system design
- Indicated in the listing
- Hands-on vs management
- Hands-on
Similar jobs
Full job description
Senior C++ Contract Software Engineer | Fully Remote
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Daily Rate Contract
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High-Scale Greenfield Build
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Global impact
Drive Global Financial Access Through High-Performance C++ Engineering
A well-established and rapidly expanding global fintech business is bringing on a Senior C++ Engineer to accelerate a core greenfield build.
The company’s underlying mission is financial inclusion—building modern payment technologies that provide vital financial services and enable life-changing payments to underprivileged and underbanked populations around the world.
This contract provides a rare mix of pure greenfield development, hard technical problems at scale, and real-world purpose. You’ll join a lean, highly capable core engineering team where your work will have high visibility and immediate impact. With minimal red tape, quick decision-making, and high trust, you can focus purely on doing what you do best: architecting and shipping clean, resilient, high-concurrency software.
Key Responsibilities
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Architect & Build: Design, implement, and maintain high-throughput, low-latency C++ applications that power critical international payment flows.
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Ship Greenfield Code: Drive new backend capabilities across C++, Golang, PHP, and HTML to expand financial accessibility into new emerging markets.
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End-to-End Delivery: Take full technical ownership of complex features from design and multi-threaded implementation through to testing and deployment.
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Collaborate at Scale: Work closely alongside senior developers, support engineers, and global technology partners to ensure reliability and performance.
What We’re Looking For
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6+ years of battle-tested software engineering experience in production C++ environments.
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Deep technical depth in multi-threaded programming and high-concurrency systems architecture.
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Strong mastery of REST API design principles and microservices integration.
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Solid hands-on experience with relational databases and writing performance-tuned SQL.
Contract Summary
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Role Type: Daily Rate Contract (Initial 6–12 month duration, strong likelihood of extension).
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Location: 100% Fully Remote.
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Rate: Highly competitive daily rate (DOE).
To discuss rate expectations, contract terms, or project specifics in confidence, reach out to Samuel Knox on +353 1 960 9973 or send your CV directly to .
Interview prep pack
Grounded in this listing. Use it to prepare examples before you apply.
Your interview focus
Based on this listing, the role is a senior-level, fully remote contract position focused on architecting and delivering high-performance, multi-threaded C++ systems for a global fintech greenfield project. The position emphasizes technical ownership, backend development, and collaboration to expand financial access in emerging markets.
- C++ concurrency expertise·Medium
- REST API and microservices·High
- SQL/database optimization·High
- End-to-end feature ownership·High
Only have 30 minutes?
Follow a focused preparation plan based on this job.
Start 30-minute prep
Your 30-minute plan
Review Multi-threaded C++ Projects
0–8 minSelect 1-2 recent projects where you solved concurrency or performance challenges and prepare concise stories.
Summarize REST API and Microservices Work
8–14 minList key REST API projects, focusing on design decisions, integration, and cross-language communication.
Refresh SQL Optimization Techniques
14–20 minRevisit examples of query tuning, indexing, and schema design for high-traffic systems.
Prepare End-to-End Delivery Examples
20–26 minOutline 1-2 features you owned from inception to deployment, emphasizing testing and reliability.
Draft Role-Specific Questions
26–30 minWrite down 2-3 questions about the project, team, and contract to ask during the interview.
Talking points
, 6 itemsDesigning High-Throughput, Low-Latency C++ Applications
Be ready to discuss specific examples where you built or optimized C++ systems for speed and reliability, as this is central to the role.
Multi-threaded Programming and Concurrency Challenges
Prepare to explain your approach to concurrency, synchronization, and debugging in complex, multi-threaded environments.
REST API Design and Microservices Integration
Demonstrate your experience architecting and consuming RESTful APIs, especially in distributed or microservices-based systems.
Performance-Tuned SQL and Relational Database Experience
Showcase your ability to write efficient SQL queries and optimize database interactions for high-scale applications.
End-to-End Feature Ownership
Be ready to describe situations where you took a feature from design through implementation, testing, and deployment.
Collaboration in Lean, High-Impact Teams
Highlight your experience working closely with other engineers and stakeholders to deliver reliable, scalable solutions.
What to research
, 4 itemsRecent C++ Multi-threaded Projects
Review and prepare to discuss specific examples of high-concurrency C++ systems you have built or optimized.
REST API and Microservices Experience
Gather examples of designing, implementing, and integrating RESTful APIs, especially in microservices architectures.
SQL Performance Tuning
Refresh your knowledge of optimizing SQL queries and relational database performance in production environments.
End-to-End Feature Delivery
Prepare stories that demonstrate your ownership of features from design through deployment, including testing and monitoring.
Questions to ask
, 6 itemsWhat are the main technical challenges currently facing the greenfield build?
Why ask this? To understand the project's complexity and where your expertise will be most valuable.
How is the engineering team structured, and how do remote team members collaborate?
Why ask this? To clarify team dynamics and expectations for remote work.
What is the typical process for feature design, code review, and deployment?
Why ask this? To assess the maturity of development practices and your potential workflow.
How does the company measure the success and impact of engineering contributions?
Why ask this? To align your work with organizational goals and understand performance metrics.
What opportunities exist for cross-functional collaboration with other technology partners?
Why ask this? To gauge the breadth of interaction and influence across the organization.
What are the expectations for contract extension or transition to longer-term roles?
Why ask this? To clarify contract terms and future opportunities.
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