<div class="content-intro"><h2 data-pm-slice="1 1 []">WHO ARE WE</h2> <p>Cognism is the leading provider of European B2B data and sales intelligence. Ambitious businesses of every size use our platform to discover, connect, and engage with qualified decision-makers faster and close more deals. Headquartered in London with global offices, Cognism’s contact data and contextual signals are trusted by thousands of revenue teams to eliminate the guesswork from prospecting.</p></div><p><strong><span data-contrast="none"><span data-ccp-parastyle="heading 2">About Cognism</span></span></strong><span data-ccp-props="{"134245418":true,"134245529":true,"335559738":200,"335559739":0}"> </span></p> <p><span data-contrast="auto">Cognism is building Europe's leading B2B Sales Intelligence platform. Our engineering organisation is transforming around customer outcomes, data quality and AI-first engineering. The Warsaw Hub is being established as one of Cognism's two primary engineering centres and will play a key role in the company's long-term growth.</span><span data-ccp-props="{}"> </span></p> <p><strong><span data-contrast="none"><span data-ccp-parastyle="heading 2">About the Role</span></span></strong><span data-ccp-props="{"134245418":true,"134245529":true,"335559738":200,"335559739":0}"> </span></p> <p><span data-contrast="auto">As a Senior Software Engineer, you will build the services that power Cognism's strategic Data-as-a-Service (DaaS), APIs and Model Context Protocol (MCP) capabilities. You will work on cloud-native distributed systems processing large volumes of business data and exposing it through secure, scalable APIs used by enterprise customers and AI-powered workflows. This role is ideal for engineers who enjoy building high-quality backend systems while owning software throughout its lifecycle.</span><span data-ccp-props="{}"> </span></p> <p><strong><span data-contrast="none"><span data-ccp-parastyle="heading 2">What You'll Do</span></span></strong><span data-ccp-props="{"134245418":true,"134245529":true,"335559738":200,"335559739":0}"> </span></p> <ul> <li data-leveltext="" data-font="Symbol" data-listid="1" data-list-defn-props="{"335552541":1,"335559685":360,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"singleLevel"}" data-aria-posinset="1" data-aria-level="1"><span data-contrast="auto"><span data-ccp-parastyle="List Bullet">Design, build and maintain backend services supporting DaaS, APIs and MCP</span></span></li> </ul> <ul> <li data-leveltext="" data-font="Symbol" data-listid="1" data-list-defn-props="{"335552541":1,"335559685":360,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"singleLevel"}" data-aria-posinset="2" data-aria-level="1"><span data-contrast="auto"><span data-ccp-parastyle="List Bullet">Deliver production-ready software with strong focus on quality, reliability and performance</span></span></li> </ul> <ul> <li data-leveltext="" data-font="Symbol" data-listid="1" data-list-defn-props="{"335552541":1,"335559685":360,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"singleLevel"}" data-aria-posinset="3" data-aria-level="1"><span data-contrast="auto"><span data-ccp-parastyle="List Bullet">Own features from technical design through deployment and operational support</span></span></li> </ul> <ul> <li data-leveltext="" data-font="Symbol" data-listid="1" data-list-defn-props="{"335552541":1,"335559685":360,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"singleLevel"}" data-aria-posinset="4" data-aria-level="1"><span data-contrast="auto"><span data-ccp-parastyle="List Bullet">Collaborate closely with Product Managers, Architects, Platform and Data Engineering teams</span></span></li> </ul> <ul> <li data-leveltext="" data-font="Symbol" data-listid="1" data-list-defn-props="{"335552541":1,"335559685":360,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"singleLevel"}" data-aria-posinset="5" data-aria-level="1"><span data-contrast="auto"><span data-ccp-parastyle="List Bullet">Contribute to architectural decisions and continuously improve engineering standards</span></span></li> </ul> <ul> <li data-leveltext="" data-font="Symbol" data-listid="1" data-list-defn-props="{"335552541":1,"335559685":360,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"singleLevel"}" data-aria-posinset="6" data-aria-level="1"><span data-contrast="auto"><span data-ccp-parastyle="List Bullet">Write automated tests and participate in code reviews</span></span></li> </ul> <ul> <li data-leveltext="" data-font="Symbol" data-listid="1" data-list-defn-props="{"335552541":1,"335559685":360,"335559991":360,"469769226":"Symbol","469769242":[8226],"469777803":"left","469777804":"","469777815":"singleLevel"}" data-aria-posinset="7" data-aria-level="1"><span data-contrast="auto"><span data-ccp-parastyle="List Bullet">Use AI-assisted engineering tools to improve development productivity</span></span></li> </ul> <p><strong><span data-contrast="none"><span data-ccp-parastyle="heading 2">What Success Looks Like</span&g