Senior Software Developer – Platform Engineering

Posted Yesterday
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Hiring Remotely in London, GBR
In-Office or Remote
Senior level
HR Tech • On-Demand • Sharing Economy • Software
The Role
Develop and refine a scalable marketplace platform, including core features, payment gateway integrations, APIs, third-party services, and AI capabilities. Review architecture, troubleshoot bugs and performance issues, improve stability, scalability, security, and user experience, and deliver tested, maintainable code. Collaborate with product and technical stakeholders during a one-month project engagement focused on platform enhancements and integrations.
Summary Generated by Built In

Job Description for Senior Software Developer


Position Title: Senior Software Developer


Location: Remote


Company: Client


About Us: Welcome to Sortitt, the revolutionary marketplace that's reshaping the future of resource acquisition. As a dynamic platform, Sortitt connects businesses with top-tier resources across the globe, transcending traditional constraints. Our cutting-edge approach delivers tailored solutions that precisely match client demands, creating opportunities for professionals seeking remote engagements. At Sortitt, resources are available on demand, and clients are empowered with diverse choices to ensure the best talent with matching skills. Join us in revolutionizing talent sourcing—where innovation, flexibility, and growth converge to redefine success in the modern workforce.


Job Summary: We are looking for a Senior Software Developer to support the development and refinement of a marketplace/aggregator platform. The ideal candidate will have strong experience in building scalable web platforms, integrating third-party services and payment gateways, and working with modern AI-native development tools.

This is a 1-month project-based engagement with a focus on platform development, feature enhancements, integrations, performance improvements, and overall product refinement.


Responsibilities:

  • Develop and refine a scalable marketplace/aggregator platform.
  • Build and enhance core platform features based on product requirements.
  • Integrate and maintain payment gateways and payment-related services.
  • Work with APIs and third-party integrations to support platform functionality.
  • Implement and integrate AI-native tools and capabilities where relevant to the platform.
  • Review the existing platform architecture and identify areas for improvement.
  • Troubleshoot bugs, performance issues, and technical limitations.
  • Improve platform stability, scalability, security, and overall user experience.
  • Develop new features and refine existing functionality based on project priorities.
  • Collaborate with product and technical stakeholders to translate requirements into functional solutions.
  • Ensure clean, maintainable, and well-documented code.
  • Conduct testing and debugging before deployment.
  • Support platform updates and technical improvements throughout the engagement.

Qualifications:

  • 5+ years of professional software development experience, preferably in a senior engineering role.
  • Proven experience building marketplaces, aggregators, SaaS platforms, or similar web-based products.
  • Strong understanding of full-stack web development.
  • Experience with API development and third-party integrations.
  • Hands-on experience integrating payment gateways/payment systems.
  • Experience working with AI tools, AI APIs, or AI-native development workflows.
  • Strong understanding of databases, backend architecture, and cloud-based applications.
  • Experience improving and maintaining existing platforms, not just greenfield development.
  • Strong debugging and problem-solving abilities.
  • Ability to independently assess technical requirements and recommend appropriate solutions.
  • Comfortable working in a fast-paced, project-based environment with tight timelines.
  • Experience working on multi-vendor marketplace or aggregator platforms.
  • Experience with Stripe, PayPal, or other payment gateway integrations.
  • Familiarity with LLM APIs, AI agents, automation tools, or AI-powered product features.
  • Experience with cloud platforms such as AWS, Azure, or Google Cloud.
  • Experience with modern development frameworks and technologies.
  • Experience with authentication, subscriptions, invoicing, and transaction workflows.

Benefits:

  • Competitive compensation with opportunities for growth and advancement.
  • Exposure to a dynamic and innovative work environment.
  • Collaborative and team-oriented work culture.

Equal Opportunity Employer:

Sortitt, along with its clients, values diversity and inclusion. We encourage candidates from all backgrounds and experiences to apply. 


 

Skills Required

  • 5+ years of professional software development experience, preferably in a senior engineering role
  • Experience building marketplaces, aggregators, SaaS platforms, or similar web-based products
  • Strong understanding of full-stack web development
  • Experience with API development and third-party integrations
  • Hands-on experience integrating payment gateways or payment systems
  • Experience working with AI tools, AI APIs, or AI-native development workflows
  • Strong understanding of databases, backend architecture, and cloud-based applications
  • Experience improving and maintaining existing platforms
  • Strong debugging and problem-solving abilities
  • Ability to independently assess technical requirements and recommend appropriate solutions
  • Comfort working in a fast-paced, project-based environment with tight timelines
  • Experience with multi-vendor marketplace or aggregator platforms
  • Experience with Stripe, PayPal, or other payment gateway integrations
  • Familiarity with LLM APIs, AI agents, automation tools, or AI-powered product features
  • Experience with AWS, Azure, or Google Cloud
  • Experience with modern development frameworks and technologies
  • Experience with authentication, subscriptions, invoicing, and transaction workflows
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The Company
HQ: London
5 Employees
Year Founded: 2023

What We Do

Sortitt is a digital talent technology platform that connects businesses with vetted global professionals and on-demand workforce solutions. It helps companies access full-time, part-time, project-based, and freelance talent quickly, while reducing recruitment and payroll costs. The platform also supports businesses through flexible gig matching, compliant hiring, secure payments, and scalable offshore teams, enabling startups and enterprises to grow faster with tailored staffing.

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