Senior API Engineer

Overview

About CBTW

CBTW is a global independent tech consultancy group. With a team of more than 3,000 talented tech specialists on the ground in over 35 cities across Europe, the USA, Asia, Australia and Africa, we serve clients of all sizes. We believe collaboration betters our world. Our unique open ecosystem model allows us to deliver end-to-end tech solutions.

 

About Our Partner

Our Partner is an Australian & New Zealand-owned consulting firm. Pioneering AI-first solutions, our partner is a next-gen consultancy that blends brilliant thinkers with expert engineers, transforming businesses through data, digital, cyber security, and cloud expertise.

Responsibilities

As a Senior Software Engineer, you will enjoy working on a diverse and exciting range of projects across various clients and industries.  We are a technology agnostic business that opens endless possibilities for you to work across multiple tech stacks and multiple platforms with the opportunity to upskill and cross skill in the following:  

• API Development - Java, Kotlin, Golang, Node.js, Kafka and GraphQL
• Integration Technologies - Apigee, Kong
• Multi Cloud Platforms - AWS, GCP, Azure

We will always evolve as the technology landscape changes so we both won’t be left behind!

Y  Our day to day:

• Thrive in our collaborative, flat-structured environment, where your day-to-day work is all about teamwork and shared decision-making
• Craft technology solutions that go above and beyond to exceed our clients expectations
• Develop high quality code that can function with existing code, patterns and architectural techniques
• Provide clarification of technical requirements and the translation of these requirements into technical design
• Monitor and assess industry developments and incorporate them into solutions where appropriate
• Leverage and advocate for AI-assisted development tools (eg: Claude/Cline) to accelerate development
• Implement structured agentic workflows (setup-plan-act) across team development practices
• Lead by example in reviewing and refining AI-generated code, ensuring it meets architectural standards
• Effectively utilise development best practices such as CI/CD
• Actively participate in team agile development practices
• Ensure appropriate quality is maintained through practices such as unit testing
• Design systems that can be deployed and managed effectively in a production environment.
• Use professional judgement while treating colleagues and clients with respect and compassion.

Qualifications

• Developing applications on both greenfield projects & existing applications
• Experience with modern API technologies & microservices
• An understanding of API gateway technologies such as Kong &/or Apigee
• The ability to code in Java and have a willingness to learn new ones
• It would be great if you have experience building and maintaining cloud-based applications - Azure, AWS and/or GCP
• Proficiency with AI-assisted coding tools and the ability to coach team members in their effective use
• Understanding of AI code security, quality assurance and when human oversight is critical
• Experience with MCP servers, shared context strategies and team-based agentic workflows
• A self-starter mindset and an ability to work hands-on, to find answers and work with ambiguity
• At Mantel, we want you to be yourself. We trust our team members to use their professional judgment while treating colleagues and clients with respect, compassion, and professionalism in alignment with our five principles.
• You take ownership, always stepping up to help and prioritising your teammates. You're also a clear, kind communicator who makes sound decisions based on good judgement