Join a Fast-Growing Tech Startup as a Senior Software Engineer Are you a seasoned software engineer looking for an exciting opportunity to make a real impact? Our client is a rapidly growing tech startup, backed by a renowned investment group, and is on a mission to transform the way people plan for and deal with life’s most challenging moments. About the Company: Our client is revolutionizing the industry with an innovative platform that brings a human touch to planning for the future. The team is passionate, driven, and committed to making a difference. With recent investment and ambitious growth plans, they are looking for talented individuals to join their dynamic team. The Role: As a Senior Software Engineer, you will be a key member of the growing engineering team, responsible for designing, building, testing, deploying, and maintaining scalable systems. This is an exciting opportunity to work on a greenfield project, where you’ll have the autonomy to make key decisions on architecture and development, contributing to both back-end services and some front-end components. A key aspect of the role includes working with and integrating Large Language Models (LLMs) into products, so experience in this area is a plus. While the preference is for expertise in AWS (using services like Lambda, S3, SNS, SQS, DynamoDB), candidates with comparable experience in other cloud platforms like GCP or Azure are also considered. You will work closely with the Engineering Manager and Lead Developer to deliver high-quality solutions that enhance the product, and collaborate across teams to bring impactful features to life. As part of a fast-paced startup, you will thrive in an environment that values collaboration, flexibility, and quick iteration while maintaining the balance between speed and quality. Key Responsibilities: Lead the design and development of scalable, cloud-native systems, leveraging modern architecture principles such as microservices and serverless frameworks. Write maintainable, efficient, and clean code primarily in Python, focusing on performance, scalability, and reliability. Build and maintain robust automated testing and CI/CD pipelines to support fast, frequent, and reliable deployments. Work closely with cross-functional stakeholders, including product managers, designers, and other engineers, to gather requirements, develop features, and address user needs. Drive best practices in development, demonstrating a strong balance between rapid iteration and high-quality output. Participate in code reviews, architectural discussions, and continuous improvement initiatives to foster a culture of technical excellence. Champion a lean mindset and agile methodologies, contributing to sprint planning, daily stand-ups, and retrospectives. Engage with the product and users to understand their needs, ensuring that the solutions delivered align with business goals and enhance the customer experience.Who You Are: Must Haves: Extensive experience in software development using Python or similar languages. Strong cloud experience, ideally with AWS (e.g., Lambda, S3, SNS, SQS, DynamoDB); however, similar expertise in GCP or Azure is also highly valued. Proven ability to design, build, and maintain cloud-native applications with a focus on scalability, performance, and reliability. Hands-on experience with automated testing practices and CI/CD tools such as CircleCI, Jenkins, GitHub Actions, or cloud-native solutions like AWS CodePipeline. Ability to thrive in a startup environment, embracing change, iteration, and rapid development cycles. Strong understanding of RESTful APIs, with experience in building, consuming, and optimizing them. Experience or familiarity with OpenAI APIs or other LLMs, with an interest in integrating these technologies into products. Excellent collaboration and communication skills, enabling smooth work across engineering and non-engineering teams. Experience working in agile teams and familiarity with agile development practices. A passion for building products that deliver real value to users and a strong customer-centric approach.Nice to Haves: Experience with serverless frameworks (e.g., Serverless Framework, AWS SAM) or equivalent technologies on GCP/Azure. Familiarity with infrastructure as code (IaC) tools like AWS CloudFormation, Terraform, or equivalent tools in other cloud environments. Experience with containerization (e.g., Docker) and orchestration tools like Kubernetes or ECS. Background in event-driven architecture. Understanding of Python web frameworks such as Flask or FastAPI. Experience optimizing applications for cloud performance, cost-efficiency, and scalability. Hands-on experience with monitoring and logging tools (e.g., AWS CloudWatch, Datadog, ELK stack). An understanding of lean software development principles and practices focused on delivering value quickly. A passion for mentoring and sharing knowledge, contributing to a culture of continuous learning and growth.Benefits: Flexible working: 3 days in the office (London, Holborn) Work from anywhere in the world for up to 4 weeks per year. An extra holiday day for your birthday Life insurance, health insurance, will & LPAs Enhanced parental leave Share incentive scheme Cycle to Work Scheme and access to the Electric Vehicle (EV) Salary Sacrifice Scheme. Charitable fundraising matching up to £500. Support for entrepreneurial ventures through the Springboard program. Our client is committed to creating an inclusive environment and is proud to be an equal opportunity employer. If you’re ready to join a team that’s making a real difference, they’d love to hear from you Location London, UK Trading as TEKsystems. Allegis Group Limited, Maxis 2, Western Road, Bracknell, RG12 1RT, United Kingdom. No. (phone number removed). Allegis Group Limited operates as an Employment Business and Employment Agency as set out in the Conduct of Employment Agencies and Employment Businesses Regulations 2003. TEKsystems is a company within the Allegis Group network of companies (collectively referred to as "Allegis Group"). Aerotek, Aston Carter, EASi, Talentis Solutions, TEKsystems, Stamford Consultants and The Stamford Group are Allegis Group brands. 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