Hard Yaka

Hard Yaka is seeking a Security Engineer, Product Security to join our team in Greater London. In this role, you'll help build secure products by collaborating closely with engineering teams and product managers to identify risks early and improve security quality across the software development lifecycle. The ideal candidate will have 2-5 years in product or application security, understanding common vulnerabilities, and experience with security testing tools. Join us to make security practical and actionable while leveraging AI tools.

Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We're redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace. Our momentum comes from a simple idea: help teams work smarter, not harder. Aircall's AI Voice Agent automates routine calls, AI Assist streamlines post-call work, and AI Assist Pro delivers real-time guidance so people can do their best work. The result is higher revenue, faster resolutions, and teams that scale with confidence. Aircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We've built a product customers love and a business that's scaling quickly, backed by world-class investors and driven by rapid AI innovation across multiple product lines. At Aircall, you'll join a company in motion. We're ambitious, product-driven, and execution-focused, with visible impact, fast decisions, and real growth. How we work at Aircall: We're customer-obsessed, data-driven, and focused on delivering meaningful outcomes. We value ownership, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast-moving environment where trust and impact matter, you'll feel at home here. About the role: As a Security Engineer, Product Security, you will help Aircall build and ship secure products by working closely with engineering teams and product managers to identify risk early, reduce vulnerabilities, and improve security quality across the software development lifecycle. You'll support secure-by-design practices and help ensure security is integrated into how teams design, build, test, and release software. In this role, you'll be hands-on across threat modelling, vulnerability detection and remediation, and security testing. You will partner with engineers to make security practical and actionable - helping teams move quickly while raising the security bar. You'll also have a strong bias to leveraging AI to scale. Key Responsabilities: Partner with engineering teams to review designs and implementation plans, identifying security risks early and recommending mitigations. Perform threat modelling for new features and major changes, helping teams document risks, assumptions, and security controls. Identify and help remediate common vulnerability classes across services and APIs (e.g., auth/authz, injection, data exposure, logic flaws). Triage and support remediation of vulnerabilities identified through SAST/DAST tools, internal testing, or third-party findings. Conduct security testing and validation, including targeted manual testing for high-risk areas. Help improve secure development practices by creating reusable guidance, checklists, and secure patterns for engineering teams. Contribute to security tooling and automation that improves coverage, reduces false positives, and streamlines security reviews. Assist with product security incidents by supporting investigation, impact analysis, and follow-up remediation. Communicate security risks clearly and pragmatically, helping teams prioritize effectively and ship safely. Document learnings and contribute to evolving product security processes and standards. Requirements: 2-5 years of experience in Product Security, Application Security, or software engineering with a strong security focus. Strong understanding of web application and API security fundamentals and common vulnerability classes (OWASP Top 10). Experience performing security reviews, threat modelling, or secure architecture assessments for software systems. Familiarity with security testing tools and practices (SAST/DAST, dependency scanning, fuzzing, manual testing). Comfort reading and reviewing production code in at least one language (e.g., Python, Go, Java, JavaScript/TypeScript). Exposure to automated or AI-assisted security tools or workflows, and interest in applying them to improve developer experience and security outcomes. Ability to work cross-functionally with engineering teams and communicate findings in a constructive, actionable way. Proven ability to drive remediation efforts and follow through on risk reduction outcomes. Nice-to-have: Experience with cloud-native architectures (AWS/GCP/Azure), microservices, Kubernetes, service-to-service authentication, and secrets management. Experience tuning security tools to reduce noise and improve signal (e.g., improving rules, baselines, or pipelines). Familiarity with secure SDLC practices and security champions programs. Exposure to bug bounty/vulnerability disclosure or working with external researchers. Experience improving internal security automation or developer workflows (including using AI-assisted tooling). Why join us? Key moment to join Aircall in terms of growth and opportunities Our people matter, work-life balance is important at Aircall Fast-learning environment, entrepreneurial and strong team spirit 45+ Nationalities: cosmopolite & amp; multi-cultural mindset Competitive salary package & amp; benefits DE&I Statement: At Aircall, we believe diversity, equity and inclusion - irrespective of origins, identity, background and orientations - are core to our journey. We pride ourselves on promoting active inclusion within our business to foster a strong sense of belonging for all. We're working to create a place filled with diverse people who can enrich and learn from one another. We're committed to ensuring that everyone not only has a seat at the table but is valued and respected at it by providing equal opportunities to develop and thrive. We are strongly committed to hiring a diverse and multicultural team and we encourage applications from traditionally underrepresented backgrounds.

Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We're redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace. Our momentum comes from a simple idea: help teams work smarter, not harder. Aircall's AI Voice Agent automates routine calls, AI Assist streamlines post-call work, and AI Assist Pro delivers real-time guidance so people can do their best work. The result is higher revenue, faster resolutions, and teams that scale with confidence. Aircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We've built a product customers love and a business that's scaling quickly, backed by world class investors and driven by rapid AI innovation across multiple product lines. At Aircall, you'll join a company in motion. We're ambitious, product driven, and execution focused, with visible impact, fast decisions, and real growth. How we work at Aircall: We're customer obsessed, data driven, and focused on delivering meaningful outcomes. We value ownership, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast moving environment where trust and impact matter, you'll feel at home here. We are looking for an engaged and passionate Senior Data Engineer to join our growing Engineering Team. In this role, you will be a key member of the team managing our analytics and event platform stack. As part of the Analytics & Data Platform team, you will build features for over 22,000 customers across the globe. Your work will unlock the value of data, empowering our customers to make informed decisions through real time insights, monitoring, and comprehensive analytical reports. Your role at Aircall Have key responsibilities within the requirements analysis, scalable & low latency streaming platform solution design, architecture, and end-to-end delivery of key modules in order to provide near real-time data solutions for our product Analyze and translate business needs into data model & optimize for big data Identify slow queries and optimize for better performance Write clean scalable code using Scala / python / SQL and test and deploy applications and systems Solve our most challenging data problems, in near real-time, utilizing optimal data architectures, frameworks, query techniques, sourcing from structured and unstructured data sources. Be part of an engineering organization delivering high quality, secure, and scalable solutions to Aircall clients Involvement in product and platform performance optimization and live site monitoring Mentor team members through giving and receiving actionable feedback. Our tech. stack: AWS (Kinesis,Kafka, s3, DMS, Glue, EMR, EKS, Redshift, Spectrum), Apache Pinot, Apache Flink and Airflow. A continuous deployment process based on GitLab A little more about you: A Bachelor's degree in a technical field (eg. computer science or mathematics). 3+ years experience with near real-time analytics 5+ years experience with a modern programming language such as Scala, Python, Go, Typescript Experience of designing complex data processing pipeline Experience of data modeling (star schema, dimensional modeling etc) in AWS redshift Experience of query optimisation Experience of kafka is a plus Shipping and maintaining code in production You like sharing your ideas, and you're open-minded Why join us? Key moment to join Aircall in term of growth and opportunities Our people matter, work-life balance is important at Aircall Fast-learning environment, entrepreneurial and strong team spirit 45+ Nationalities: cosmopolite & multi-cultural mindset Competitive salary package & benefits (health coverage, lunch, commute, sports) At Aircall, we believe diversity, equity and inclusion, irrespective of origins, identity, background and orientations, are core to our Aircall journey. We promote active inclusion to foster a strong sense of belonging which is one of our main strengths as a business. We strive to assemble diverse people that can enrich and learn from each other. We pledge to make sure everyone not only has a seat at the table but is valued at the table providing equal opportunities to develop and thrive. Want to know more about candidate privacy? Find our Candidate Privacy Notice.

Aircall is seeking a Senior Data Engineer to manage their analytics platform. In this role, you will design scalable solutions, analyze business needs, and optimize data models. Candidates should have over 3 years of experience in near real-time analytics and proficiency in Scala or Python. This role offers a dynamic work environment and a competitive salary package, promoting diversity and inclusion at its core.

Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We're redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace. Our momentum comes from a simple idea: help teams work smarter, not harder. Aircall's AI Voice Agent automates routine calls, AI Assist streamlines post-call work, and AI Assist Pro delivers real-time guidance so people can do their best work. The result is higher revenue, faster resolutions, and teams that scale with confidence. Aircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We've built a product customers love and a business that's scaling quickly, backed by world class investors and driven by rapid AI innovation across multiple product lines. At Aircall, you'll join a company in motion. We're ambitious, product driven, and execution focused, with visible impact, fast decisions, and real growth. How we work at Aircall We're customer obsessed, data driven, and focused on delivering meaningful outcomes. We value ownership, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast moving environment where trust and impact matter, you'll feel at home here. About the role As a Senior Backend Software Engineer, you will be responsible for the design, development, deployment, and operation of business critical features that add customer value on top of voice. Best practices, evangelization, and mentoring in your team and across the whole of Engineering will be part of your day to day job. Quality, excellence, and agility drive our delivery processes and you will help us level these up. Using a variety of back end stacks, appropriate for each requirement, but always hosted on AWS, we build added value and resilient services on top of voice and fully integrate with our customers' business critical tools (CRM, Helpdesk, E Commerce, ). Key Responsibilities Participate in requirements analysis to help with providing the right technical and business solutions for our customers Have key responsibilities within the design, architecture, and end to end delivery of key modules Write clean scalable code and test and deploy applications and systems Revise, update, refactor, and debug code Be part of an engineering organization delivering high quality, secure, voice solutions to Aircall clients Involvement in product and platform performance optimization and live site monitoring Participate in an on call rotation to respond to critical system issues and ensure continuous system reliability Mentor team members Qualifications You have at least 6+ years of experience in back end development in a large scale, typed language, with experience in Typescript, with a focus on delivering for security, scalability, availability, and performance You will have worked extensively with AWS in a production environment and understand how to design for, deploy on and get the best out of, the environment and services provided by Amazon You can talk easily and spontaneously about most of the offerings on AWS, when to use them, and how, and can explain to junior engineers. You have experience working with serverless services using infrastructure as code like CloudFormation or Terraform. Security is at the forefront of your mind in everything that you do. And last but not least, if you have experience working with GraphQL it will be a huge plus! Why join us Key moment to join Aircall in terms of growth and opportunities Our people matter, work life balance is important at Aircall Fast learning environment, entrepreneurial and strong team spirit 45+ Nationalities: cosmopolite & multi cultural mindset Competitive salary package & benefits DE&I Statement At Aircall, we believe diversity, equity and inclusion - irrespective of origins, identity, background and orientations - are core to our journey. We pride ourselves on promoting active inclusion within our business to foster a strong sense of belonging for all. We're working to create a place filled with diverse people who can enrich and learn from one another. We're committed to ensuring that everyone not only has a seat at the table but is valued and respected at it by providing equal opportunities to develop and thrive. We will constantly challenge ourselves to make sure that we live up to our ambitions around diversity, equity and inclusion, and keep this conversation open. Above all else, we understand and acknowledge that we have work to do and much to learn.

Hard Yaka is looking for an experienced Senior Backend Software Engineer to join their team in the United Kingdom. You will be responsible for designing, developing, and operating critical features that enhance customer value and ensuring the delivery of secure and scalable voice solutions. The ideal candidate will have over 6 years of back-end development experience, specifically with AWS and Typescript. Join us to make an impact in a collaborative environment that values diverse thinking.

Hard Yaka is looking for an experienced Senior Software Engineer to join their dynamic team in Greater London. You will be responsible for the design, development, deployment, and operation of critical business features that add customer value. The ideal candidate has over 7 years of experience, particularly with TypeScript and Node.js, and an understanding of AWS for high availability services. The role emphasizes collaboration, mentoring, and staying updated on technologies to build secure and scalable solutions. Join a multicultural team focused on delivering excellence and driving innovation.

Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We're redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace. Our momentum comes from a simple idea: help teams work smarter, not harder. Aircall's AI Voice Agent automates routine calls, AI Assist streamlines post-call work, and AI Assist Pro delivers real time guidance so people can do their best work. The result is higher revenue, faster resolutions, and teams that scale with confidence. Aircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We've built a product customers love and a business that's scaling quickly, backed by world class investors and driven by rapid AI innovation across multiple product lines. At Aircall, you'll join a company in motion. We're ambitious, product-driven, and execution-focused, with visible impact, fast decisions, and real growth. How we work at Aircall We're customer obsessed, data driven, and focused on delivering meaningful outcomes. We value ownership, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast moving environment where trust and impact matter, you'll feel at home here. We are looking for an engaged and passionate Senior Software Engineer to join our growing engineering department and be part of our engineering teams. As a Senior Software Engineer, you will be responsible for the design, development, deployment, and operation of business critical features that add customer value. Operational excellence, metrics, observability and best practices, evangelization, and mentoring in your team and across the whole of Engineering will be part of your day to day job. Quality, excellence, and agility drive our delivery processes and you will help us level these up. Using NodeJS and Typescript back end stacks, appropriate for each requirement, but always hosted on AWS, we build added value and resilient services on top of voice and fully integrate with our customers' business critical tools (CRM, Helpdesk, E Commerce, ). Your Create, design, develop, test, and monitor your code in production autonomously and reliably Collaborate with product managers, designers and other engineers to offer pragmatic solutions to real world problems and implement them end to end Work with your team to design high quality, secure, and scalable solutions and be accountable for their execution Obtain a good understanding of the business to provide relevant solutions to users and clients Mentor and promote tech growth within the teams Stay up to date on new technologies and architectures, demonstrate good judgment in their potential applications A little about you You have at least 7+ experience in back end development, using TypeScript & NodeJS/Python/Ruby/Rails or other languages, with a focus on delivering for security, scalability, availability, and performance. You have worked extensively with AWS in a production environment, preferably for high volume / high availability services and understand how to design for, deploy on and get the best out of the environment and services provided by Amazon. Experience working on frontend applications is a big plus, preferably with React. Value code simplicity, quality, performance and maintainability. Can design pragmatic & simple architectures to solve problems at scale. You possess effective and proactive communication skills, and can collaborate with different profiles and roles. Our Tech Stack You do not need to be familiar with all of our technical stack or any specific functional area, but you have a strong willingness to learn and adapt quickly. Typescript/Node.js, Python, REST API/GraphQL APIs, Ruby/Rails, React, AWS/Serverless or EKS, PostgreSQL, DynamoDB, OpenSearch, Redis Why join us? Key moment to join Aircall in terms of growth and opportunities Our people matter, work life balance is important at Aircall Fast learning environment, entrepreneurial and strong team spirit 45+ Nationalities: cosmopolite & multi cultural mindset Competitive salary package & benefits DE&I Statement: At Aircall, we believe diversity, equity and inclusion - irrespective of origins, identity, background and orientations - are core to our journey. We pride ourselves on promoting active inclusion within our business to foster a strong sense of belonging for all. We're working to create a place filled with diverse people who can enrich and learn from one another. We're committed to ensuring that everyone not only has a seat at the table but is valued and respected at it by providing equal opportunities to develop and thrive. We will constantly challenge ourselves to make sure that we live up to our ambitions around diversity, equity and inclusion, and keep this conversation open. Above all else, we understand and acknowledge that we have work to do and much to learn. Want to know more about candidate privacy? Find our Candidate Privacy Notice here.