Senior Integration Engineer

2 days ago


Islamabad, Islamabad, Pakistan Fastn Full time

Location: Remote

Type: Full-time

About Fastn

Fastn is on a mission to revolutionize how SaaS companies connect with their customers' environments. Powered by AI, we provide an embedded integration infrastructure that enables SaaS businesses to build, scale, and manage their integration ecosystem effortlessly.

With Fastn, companies can launch strategic integrations, create their own app marketplace, and unlock new revenue streams by offering seamless connectivity with the tools their customers already use. But our platform is more than just integrations; it's about accelerating market penetration, driving partner-sourced revenue, and delivering smarter, more valuable customer experiences.

If you're passionate about leading integration strategies, scaling API connectivity, and mentoring teams in a high-growth SaaS environment, Fastn is the place to be.

What You'll Do

As a Senior / Lead Integration Engineer, you will play a critical role in architecting, building, and optimizing integrations between Fastn and a broad ecosystem of SaaS applications. You will lead integration initiatives, mentor engineers, and work closely with product and engineering leadership to drive seamless, scalable, and high-performance integrations.

Your Responsibilities
  • Technical Leadership: Lead the architecture, design, and development of integrations, ensuring they are scalable, high-performance, and secure.
  • API Engineering: Design and implement robust RESTful, GraphQL, and Webhook-based APIs to enable seamless data flow.
  • Scalability & Performance: Architect integrations to handle millions of transactions per second/minute with sub-millisecond response times.
  • Automation & AI-Driven Integrations: Utilize AI/ML-based automation and data mapping to enhance connectivity and reduce manual effort.
  • Security & Compliance: Implement best practices for OAuth, API authentication, data privacy, and regulatory compliance (SOC 2, GDPR, etc.).
  • Collaboration: Partner with engineering, product, and customer success teams to ensure integrations align with business and technical goals.
  • Mentorship & Team Growth: Mentor junior engineers, conduct code reviews, and provide technical guidance to elevate the overall integration team.
  • Monitoring & Reliability: Establish observability, error handling, and performance monitoring to ensure integration reliability.
What We're Looking For

We're seeking a highly skilled engineer and leader who thrives in building scalable integration solutions and mentoring teams in a fast-paced SaaS environment. If you enjoy working with APIs, automation, and large-scale systems, this role is for you.

Must-Have Skills & Experience
  • 5+ years of experience in integration engineering, API development, or automation.
  • Proven track record in leading and architecting scalable API integrations.
  • Strong expertise in RESTful APIs, GraphQL, Webhooks, and event-driven architectures.
  • Experience designing integrations that handle millions of transactions per second/minute with low latency.
  • Proficiency in backend programming languages (Java, Python, or Node.js).
  • Hands-on experience with cloud platforms (AWS, GCP, or Azure) and serverless architectures.
  • Strong knowledge of API security, authentication (OAuth, JWT, OpenID), and compliance (SOC 2, GDPR, etc.).
  • Experience working with message queues (Kafka, RabbitMQ, etc.) and event-driven architectures.
  • Previous experience leading or mentoring engineers in a high-growth startup or SaaS company.
Nice-to-Have Skills
  • Experience with iPaaS platforms like Mulesoft, Workato, or Tray.io.
  • Familiarity with AI/ML-driven automation in integrations.
  • Hands-on experience with developer tooling, B2B SaaS integrations, or API marketplaces.
Why Join Fastn?
  • Shape the Future of SaaS Connectivity: Be a key player in defining how SaaS companies scale their integration ecosystems.
  • Work on Cutting-Edge AI & API Technologies: Solve complex integration challenges with AI-driven automation.
  • High-Impact, Leadership Role: Lead integration strategy and mentor a growing team in a fast-paced, high-growth startup.
  • Strong Engineering Culture: Collaborate with top-tier engineers solving large-scale connectivity challenges.
  • Competitive Compensation: Market-leading salary, meaningful equity, and a flexible remote work environment.
Join Us in Building the Future of SaaS Connectivity

If you're excited to lead integration initiatives, drive technical strategy, and mentor engineers, we'd love to hear from you.

Apply now and help shape the future of SaaS integrations

#J-18808-Ljbffr

  • Islamabad, Islamabad, Pakistan LeanDNA Inc Full time

    LeanDNA is helping solve the $150B problem that global manufacturers face–excess inventory tying up critical working capital and keeping manufacturing companies from being as efficient as they need to be. Without an effective way to optimize inventory, manufacturers are buying too much, too little, or placing inventory in the wrong place at the wrong...


  • Islamabad, Islamabad, Pakistan Fastn Full time

    About the RoleThis is an exciting opportunity to shape the future of SaaS connectivity at Fastn. As a Senior Integration Engineer, you will lead technical initiatives, drive scalability, and ensure seamless integration between Fastn and a broad ecosystem of SaaS applications.You will collaborate with top-tier engineers, leveraging your expertise in API...


  • Islamabad, Islamabad, Pakistan Fastn Full time

    Job DescriptionAs a Senior Integration Engineer at Fastn, you will play a critical role in architecting, building, and optimizing integrations between Fastn and a broad ecosystem of SaaS applications.You will lead integration initiatives, mentor engineers, and work closely with product and engineering leadership to drive seamless, scalable, and...


  • Islamabad, Islamabad, Pakistan Taptap Send group Full time

    About Taptap Send groupTaptap Send group is a rapidly growing fintech company dedicated to reducing inequity by helping immigrants send money home. With a strong focus on innovation and customer satisfaction, we are expanding our engineering team to develop integrations with various partners.Job ResponsibilitiesThe successful candidate will be responsible...


  • Islamabad, Islamabad, Pakistan Cedrus Group (Pvt) Ltd. Full time

    We are currently seeking a talented Azure Integration Developer to join our dynamic team. If you are passionate about developing robust integration solutions and have hands-on experience with Azure Logic Apps, Azure Functions, and preferably Bicep templates, we want to hear from you This role offers the opportunity to work with cross-functional teams to...

  • Data Integration Lead

    2 weeks ago


    Islamabad, Islamabad, Pakistan LeanDNA Inc Full time

    LeanDNA Inc is a leading provider of factory inventory optimization and shortage management solutions. Our mission is to empower supply chain professionals to dramatically reduce excess inventory, deliver on time, and establish operational command of their organization's inventory operations.Job DescriptionThe Senior Data Integration Engineer will be...


  • Islamabad, Islamabad, Pakistan Fastn Full time

    About FastnFastn is a pioneering SaaS company that revolutionizes the way businesses connect with their customers' environments. Leveraging cutting-edge AI technology, we provide an integrated infrastructure that empowers SaaS companies to build, scale, and manage their integration ecosystems seamlessly.**Role Overview:**We are seeking an exceptional Senior...

  • Senior Data Engineer

    2 weeks ago


    Islamabad, Islamabad, Pakistan LeanDNA Inc Full time

    We are seeking an experienced Senior Data Integration Engineer to join our team at LeanDNA Inc. As a key member of our data engineering team, you will be responsible for designing, implementing, and maintaining large-scale data pipelines that integrate customer data with our cloud-based Supply Chain Analytics solution.About the RoleIn this role, you will...


  • Islamabad, Islamabad, Pakistan Futuresol Tech Full time

    About the RoleFuturesol Tech is looking for a skilled Flutter Developer to join our team. As a Senior Flutter Engineer, you will be responsible for building reusable code and libraries for future use, integrating user-interface elements developed by other developers, and collaborating closely with UI/UX designers, PMs, QAs, and other developers.Design and...


  • Islamabad, Islamabad, Pakistan Taptap Send group Full time

    Our MissionReduce inequity by helping immigrants move money home, and become the leading cross-border fintech for emerging markets.The TeamFounded by Harvard grads / 3rd-time founders --- also founded Segovia (successful exit) and GiveDirectly (>300M revenue, fastest-growing NGO).Top performers from top and varied organizations (e.g., Bain, Bolt, Google,...

  • Senior Java Engineer

    4 weeks ago


    Islamabad, Islamabad, Pakistan SWATX Full time

    As a Senior Java Engineer at SWATX, you will be responsible for designing, developing, and maintaining robust Java applications that drive our initiatives. Your expertise will guide the team in implementing best practices, optimizing performance, and delivering high-quality software solutions. Collaborate with cross-functional teams to understand...


  • Islamabad, Islamabad, Pakistan Clustox Inc. Full time

    Job DescriptionWe are seeking a highly skilled Senior Data Engineer to join our team. As a key member of our data engineering group, you will be responsible for designing and optimizing data systems that power our conservation efforts.Your primary focus will be on creating scalable ETL/ELT pipelines using Azure services, integrating real-time and batch data,...

  • Senior SQA Engineer

    3 weeks ago


    Islamabad, Islamabad, Pakistan Adrem Technologies Full time

    Job Title: Senior QA EngineerExperience Level: Minimum 4 YearsWe are seeking a skilled Senior QA Engineer with expertise in manual testing and a preference for candidates with automation experience.Responsibilities:Design and execute test cases to validate software functionality.Identify, document, and track software defects.Collaborate with development...


  • Islamabad, Islamabad, Pakistan Velosi Asset Integrity Limited Full time

    Velosi Asset Integrity Limited is a trusted partner for companies seeking expert asset integrity services.We're dedicated to delivering high-quality solutions that meet the evolving needs of our clients.As a skilled API 510 Inspector, you'll be responsible for ensuring the integrity of process piping systems through thorough inspections and report...


  • Islamabad, Islamabad, Pakistan Sortitt Full time

    Job Description for Integration & Support Engineer – Payment SystemsPosition Title: Integration & Support Engineer – Payment SystemsLocation: Islamabad, Pakistan (onsite)Company: ClientAbout Us: Welcome to Sortitt, the revolutionary marketplace that's reshaping the future of resource acquisition. As a dynamic platform, Sortitt connects businesses with...

  • Senior QA Engineer

    4 weeks ago


    Islamabad, Islamabad, Pakistan Fastn Full time

    About FastnFastn is on a mission to revolutionize how SaaS companies connect with their customers' environments. Powered by AI, we provide an embedded integration infrastructure that enables SaaS businesses to build, scale, and manage their integration ecosystem effortlessly.With Fastn, companies can launch strategic integrations, create their own app...


  • Islamabad, Islamabad, Pakistan Cedrus Group (Pvt) Ltd. Full time

    Cedrus Group (Pvt) Ltd. is currently searching for a seasoned Azure Integration Developer to join our team and contribute to the design, implementation and optimization of integration workflows that support our business processes.About the CompanyWe are a leading provider of innovative solutions that leverage Azure Logic Apps, Azure Functions and Bicep...


  • Islamabad, Islamabad, Pakistan Fusemachines Full time

    Job Description OverviewWe are seeking a highly skilled Middleware Engineer to join our team at Fusemachines. In this role, you will be responsible for designing, implementing, and managing middleware systems to support enterprise applications. Your expertise will ensure seamless integration of applications and systems while optimizing performance and...


  • Islamabad, Islamabad, Pakistan Ikonicsolution Full time

    About the RoleThe Senior Full Stack Engineer will work closely with the frontend development team to integrate Vue.js components seamlessly with Laravel. This role requires strong knowledge of PHP web frameworks, object-oriented programming, and RESTful APIs.Degree(s)/Major(s): Bachelors or Masters in a relevant field from a reputed local/foreign...


  • Islamabad, Islamabad, Pakistan Fastn Full time

    Key ResponsibilitiesAs a Senior Solutions Architect, you will be responsible for:Designing and architecting scalable SaaS integration solutions.Providing technical guidance to customers on API best practices, data flow architecture, and integration strategies.Developing proof-of-concept (PoC) integrations to showcase Fastn's capabilities and assist customers...