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
Join a global fintech as a Senior C++ Engineer to architect and build high-throughput, low-latency applications for international payments. Work on greenfield projects with a lean, high-impact team, focusing on multi-threaded, high-concurrency systems and REST API integration. Fully remote contract based in Ireland.
- Design, implement, and maintain high-throughput, low-latency C++ applications for international payment flows
- 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
- Solid hands-on experience with relational databases and writing performance-tuned SQL
Experience: 6+ years
Role signals
- Technical focus
- high-concurrency C++ systems, REST APIs, SQL
- Architecture / system design
- Indicated in the listing
- Hands-on vs management
- Hands-on
Similar jobs
Full job description
Senior C++ Software Engineer – Fully Remote
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Greenfield Projects
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Global Scale
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Fast Career Growth
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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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 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: 70,000-80,000
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 for a Senior C++ Software Engineer to architect and deliver high-performance, multi-threaded systems for global fintech payment solutions, with a strong focus on greenfield development and technical ownership.
- C++ concurrency expertise·High
- REST API and microservices integration·High
- SQL performance tuning·Medium
Only have 30 minutes?
Follow a focused preparation plan based on this job.
Start 30-minute prep
Your 30-minute plan
Review and Summarize Relevant C++ Projects
0–8 minList and outline your most significant C++ projects, focusing on concurrency, performance, and end-to-end delivery.
Prepare STAR Stories for Key Responsibilities
8–15 minDraft concise STAR (Situation, Task, Action, Result) examples for multi-threading, REST APIs, and SQL optimization.
Research Modern REST API and SQL Best Practices
15–20 minRefresh your knowledge of current best practices in API design, microservices, and SQL performance tuning.
Plan Questions for the Interviewer
20–25 minSelect and tailor 3-4 questions from the provided list to ask during your interview.
Test Remote Communication Tools
25–30 minEnsure your setup for remote interviews is reliable and distraction-free, and practice concise technical explanations.
Talking points
, 5 itemsDesigning High-Throughput, Low-Latency C++ Applications
Be ready to discuss specific examples where you architected 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 building and integrating RESTful services, especially in high-availability or distributed systems.
Performance-Tuned SQL and Relational Database Use
Showcase your ability to write efficient SQL and optimize database interactions for large-scale, high-transaction systems.
End-to-End Feature Ownership
Be prepared to give examples of taking features from design through deployment, highlighting your autonomy and accountability.
What to research
, 4 itemsRecent C++ Multi-threaded Projects
Review your most relevant C++ projects involving concurrency, especially those with measurable performance outcomes.
REST API and Microservices Experience
Prepare examples of designing or integrating REST APIs, focusing on reliability, security, and scalability.
SQL Performance Tuning
Refresh your knowledge of query optimization, indexing, and schema design for high-transaction systems.
End-to-End Feature Delivery
Identify stories where you owned features from conception to deployment, emphasizing autonomy and impact.
Questions to ask
, 6 itemsWhat are the main technical challenges the team is currently facing with the greenfield payment platform?
Why ask this? Shows your interest in the real-world problems you'll help solve.
How is technical ownership and decision-making structured within the core engineering team?
Why ask this? Clarifies your level of autonomy and influence.
What tools and processes are in place for testing and deploying high-concurrency C++ applications?
Why ask this? Demonstrates your focus on quality and reliability.
How does the team collaborate with global technology partners and support engineers?
Why ask this? Assesses cross-functional and cross-cultural collaboration.
What does success look like in this role after the first six months?
Why ask this? Helps you understand expectations and priorities.
Are there opportunities to contribute to architectural decisions or influence technology choices?
Why ask this? Clarifies your potential impact on the technical direction.
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