--- title: 'Senior Software Engineer – DaaS / APIs / MCP at Cognism' canonical: 'https://feeny.ai/job/senior-software-engineer-daas-apis-mcp-cognism-poland-c29yh0kmrtbr' type: 'job' last_seen: '2026-09-06' --- # Senior Software Engineer – DaaS / APIs / MCP at Cognism - **Company:** Cognism - **Location:** Poland - **Posted:** 2026-08-26 - **Last confirmed live:** 2026-09-06 - **Apply:** https://www.cognism.com/jobs?gh_jid=4958702101 ## Job description ## WHO ARE WE 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. ## About Cognism 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. ## About the Role 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. ## What You'll Do - Design, build and maintain backend services supporting DaaS, APIs and MCP - Deliver production-ready software with strong focus on quality, reliability and performance - Own features from technical design through deployment and operational support - Collaborate closely with Product Managers, Architects, Platform and Data Engineering teams - Contribute to architectural decisions and continuously improve engineering standards - Write automated tests and participate in code reviews - Use AI-assisted engineering tools to improve development productivity What Success Looks Like - Deliver strategic platform capabilities on time - Take ownership of production services with measurable reliability improvements - Contribute reusable engineering patterns adopted by multiple teams - Act as a trusted technical mentor for less experienced engineers Required Experience - 5+ years of professional software engineering experience - Strong backend development skills using Java, Scala, Kotlin, C# or modern TypeScript/Node.js - Experience designing REST APIs and distributed microservices - Hands-on knowledge of AWS or another major cloud platform - Experience with SQL and NoSQL databases - Strong understanding of CI/CD, Git and modern software engineering practices - Excellent communication skills and fluent English ## Nice to Have - Kafka or event-driven architectures - Kubernetes and Docker - Infrastructure as Code - Experience building public APIs or developer platforms - Experience with AI coding assistants such as Claude Code, GitHub Copilot or Cursor ## Why Join Cognism You will join the founding engineering team of Cognism's Warsaw Hub, helping build a strategic platform that will shape the company's future. You'll work in a modern engineering environment with significant ownership, direct impact on product direction and opportunities to influence architecture, engineering practices and culture from the earliest stages of the hub. Hiring Process - Recruiter introduction - Hiring Manager interview - Technical coding interview - System design interview - Final leadership conversation ## WHY COGNISM At Cognism, we’re not just building a company - we’re building an inclusive community of brilliant, diverse people who support, challenge, and inspire each other every day. If you’re looking for a place where your work truly makes an impact, you’re in the right spot! Our values aren’t just words on a page—they guide how we work, how we treat each other, and how we grow together. They shape our culture, drive our success, and ensure that everyone feels valued, heard, and empowered to do their best work. Here’s what we stand for: 🤝 We Own the Outcome Together. 🤓 We Deeply Understand our Customers. 🏆 We Celebrate Impact Wherever It Comes From. At Cognism, we are committed to fostering an inclusive, diverse, and supportive workplace. We welcome applications from individuals typically underrepresented in tech, so if this role excites you but you’re unsure if you meet every requirement, we encourage you to apply! ## About Cognism ## Company Overview - **One-liner**: Cognism provides premium B2B sales intelligence and data solutions for revenue teams, with a strong focus on European markets and compliance. - **Entity Type**: Private, venture-backed (total funding $131.5M) - **Headquarters**: London, United Kingdom - **Founded**: 2015 - **Founders**: Not publicly disclosed ## Core Business - **Primary industry**: Sales Intelligence / B2B Data - **Target customers**: Enterprise and mid-market sales, marketing, and revenue operations teams (B2B, especially those prospecting into EMEA) - **Mission or purpose**: “Making data more usable” – helping teams become fluent in their data so they can find the right people, move faster, and grow without guesswork. ## Products & Services - **Sales Intelligence**: Contact and company data with phone-verified mobiles, decision-maker coverage, and actionable signals (intent, hiring, funding). - **Data-as-a-Service (DaaS)**: Real-time access to verified B2B data via API or batch delivery, powered by a proprietary data fusion engine that combines news, registries, and third-party sources. - **Data Enrichment**: Fill gaps in CRM/marketing databases, prioritise ICP segments, and keep records accurate with continuous refresh (30-day cycle for director+ data). - **CRM Enrichment**: Automatically enrich inbound leads so records are complete and routable from the moment they enter the CRM. - **Compliance Layer**: GDPR and CCPA compliant data sourcing, strong Do-Not-Call coverage, ISO 27001 and SOC2 framework alignment. ## Market Standing - **Valuation/Market Cap**: Not disclosed - **Key Metric**: Annual revenue of ~GBP 32.9M (LinkedIn estimate); total funding of $131.5M across 10 rounds - **Notable Investors/Partners**: Not listed in available sources - **Growth Signals**: Trusted by 4,000+ revenue teams worldwide; operates in 20 countries; offices in London, Boston, Paris, Cologne, Skopje, and Zadar. Note: LinkedIn reports a 17% year-over-year headcount decline (372 employees, -93 people), which may reflect restructuring or strategic shifts. ## Competitive Advantages - **Compliance-first posture**: Built-in GDPR/CCPA compliance and extensive European Do-Not-Call coverage – a key differentiator for teams selling into EMEA. - **Phone-verified data**: Additional verification layers on mobile numbers result in up to 3x higher connect rates. - **European expertise**: Deep understanding of complex European markets, regulations, and local context. - **Data refresh cadence**: Decision-maker data refreshed every 30 days, ensuring high accuracy. - **Proprietary AI-driven data fusion**: Stitches hundreds of data points per company and filters through verification layers. ## Strategic Focus - Raising the standard for B2B data quality and compliance. - Expanding platform capabilities (signals, enrichment, API) to cover the full data lifecycle. - Scaling internationally while maintaining a “data fluency” approach – precision over volume. ## Why Work Here - **Culture**: Values include “deeply understand our customers,” “own the outcome together,” and “celebrate impact wherever it comes from.” Emphasis on trust, ownership, and collaboration. - **Global team**: Employees across 20 countries with offices in London, Boston, Paris, Cologne, Skopje, and Zadar. Likely hybrid/office-based depending on location. - **Diversity**: Careers page highlights that a significant portion of the revenue org and overall workforce are women (exact percentages not provided). - **Growth**: Opportunity to work on a product that powers modern revenue teams; fast-paced environment with real impact. - **Recruitment note**: Cognism warns of recruitment scams – they only hire for roles in official office locations and never ask for payment. ## Sources 1. [cognism.com/about-us](https://www.cognism.com/about-us) 2. [cognism.com](https://www.cognism.com/) 3. [cognism.com/careers](https://www.cognism.com/careers) 4. [linkedin.com/company/cognism](https://www.linkedin.com/company/cognism) 5. 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