Senior Software Developer – Platform Engineering

Sortitt

. Develop and refine a scalable marketplace/aggregator platform .

Posted 11/9/2026contractRemote • United KingdomSeniorWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in developing and enhancing scalable marketplace platforms, integrating payment gateways, and implementing AI-native tools. Strong proficiency in full-stack web development, API integration, and maintaining platform stability and security.

Highest-signal resume keywords

Marketplace DevelopmentAPI DevelopmentPayment Gateway IntegrationAI-Native DevelopmentCloud Platform Experience

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Full-Stack Web DevelopmentDebuggingProblem-SolvingDatabase ManagementBackend ArchitectureCloud-Based ApplicationsModern Development FrameworksAuthentication WorkflowsSubscription ManagementTransaction Workflows

Soft Skills

CollaborationIndependent AssessmentAdaptability

Tools & Technologies

StripePayPalAWSAzureGoogle CloudAI APIsAutomation ToolsLLM APIs

Industry Keywords

MarketplaceAggregatorSaaS PlatformsWeb-Based ProductsPayment Systems

Tech Stack

Tools & technologies

AWSAzureCloud

About the role

Key responsibilities & impact

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

Requirements

What you’ll need

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

Comp & perks

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