Senior Software Engineer (Core Applications)

Our Mission: 6sense’s mission is to multiply what matters: growth, retention, and efficiency. We envision a future where companies, teams and people reach their full potential.

Our People: People are the heart and soul of 6sense. We serve with passion and purpose. We live by our Being 6sense values of Win as One Team, Stay Curious, Do The Right Thing, Own the Outcome, and Create Belonging. Every 6sensor plays a part in defining the future of our industry-leading technology. 6sense is a place where difference-makers roll up their sleeves, take risks, act with integrity, and measure success by the value we create for our customers. We want 6sense to be the best chapter of your career.

About The Role We are looking for a Senior Software Engineer to join our Core Applications team, responsible for building and owning the foundational platform that powers many of our flagship product experiences and core business capabilities. This team develops the underlying services, data models, and platform components that enable multiple feature teams to innovate and scale efficiently.

This is a high-impact engineering role requiring deep expertise in backend systems, distributed architectures, and large-scale data processing. You will work on designing resilient, scalable, and performant systems that serve as the backbone for critical product workflows. Experience with data pipelines, aggregations, and large-scale data processing is highly desirable, as many platform capabilities depend on transforming and serving data at scale.

Key Responsibilities

• Design, build, and maintain core platform services that support multiple product and feature teams.
• Develop highly scalable, reliable, and fault-tolerant backend systems capable of handling large-scale workloads.
• Architect and implement distributed services, APIs, and foundational frameworks that enable rapid feature development across the organisation.
• Build and optimise systems for high-throughput data ingestion, aggregation, processing, and retrieval.
• Drive improvements in platform performance, reliability, observability, and operational excellence.
• Collaborate closely with Product, Data, and Engineering teams to define and deliver scalable platform capabilities.
• Contribute to technical architecture, engineering standards, and long-term platform strategy.
• Mentor engineers and actively participate in design reviews, code reviews, and technical discussions.
• Investigate and resolve complex production issues while continuously improving system resilience and maintainability.

Required Qualifications

• 5+ years of software engineering experience building large-scale backend applications and distributed systems.
• Strong expertise in designing and operating scalable, highly available backend services.
• Experience working with large datasets and building systems that process millions of records efficiently.
• Proficiency in at least one backend programming language, with Python/Java preferred.
• Strong understanding of distributed systems concepts, including scalability, fault tolerance, consistency, and performance optimisation.
• Experience designing complex business workflows and platform services that support multiple downstream consumers.
• Strong debugging, problem-solving, and analytical skills.

Good to Have

• Experience building and maintaining large-scale data pipelines and data processing systems.
• Familiarity with data aggregation, transformation, and analytics workloads.
• Experience with event-driven architectures, streaming platforms, or workflow orchestration systems.
• Experience building shared platform capabilities, frameworks, or foundational services used by multiple engineering teams.

What You’ll Build As part of the Core Applications team, you will help create the foundational layer that powers critical product capabilities across the organisation. Your work will directly influence platform scalability, engineering velocity, and the ability of feature teams to deliver exceptional customer experiences at scale

Our Benefits: Full-time employees can take advantage of health coverage, paid parental leave, generous paid time-off and holidays, quarterly self-care days off, and stock options. We’ll make sure you have the equipment and support you need to work and connect with your teams, at home or in one of our offices.

We have a growth mindset culture that is represented in …