Jobs at Reaktor

Build, deploy, and maintain production-grade machine learning models and AI services. Responsibilities include designing scalable ML architectures, creating continuous training-data pipelines, building interfaces for end users, advising client teams on technology choices, and contributing to software development, debugging, and system architecture.

Build scalable, end-to-end LLM applications across backend, frontend, infrastructure, and production environments. Responsibilities include integrating commercial and open-source models, developing RAG pipelines with vector databases, creating evaluation and safety systems, applying prompt engineering and guardrails, and contributing to architecture, testing, and debugging. The role also involves advising client stakeholders, selecting suitable technologies, and helping teams develop AI-enabled software practices.

Lead Reaktor’s global B2B marketing strategy across brand, talent, and sales marketing. Develop sector-specific plans, strengthen brand awareness and affinity, support inbound growth, lead the global Marketing and Communications team, manage budgets, track KPIs, analyze market trends and client insights, and collaborate with business units, People & Culture, leadership, and specialists. The role is hybrid and based in Helsinki.

Leads Reaktor Group’s global communications and investor relations, including communications strategy, media and executive communications, investor messaging, financial disclosures, crisis communications, thought leadership, internal communications, copywriting, and agency management. The role builds the investor relations function for a newly listed company and partners closely with leadership, Legal, Finance, and Marketing while supporting technology, AI, and European defense positioning.

Design, implement and maintain full-stack features across front-end, back-end, databases and infrastructure. Collaborate with clients and teams to choose technologies, build CI/CD pipelines, debug, design architecture, and deliver production-ready solutions.

Develop native iOS and Android applications for gaming clients; collaborate with stakeholders and multidisciplinary teams; contribute to architecture, discovery, and iterative delivery; own testing, monitoring, and quality; occasionally work full‑stack and with Motion Designer on polished animations.

Senior Fullstack Developer building and improving web applications, backend services, APIs and production systems. Work spans frontend, backend and infrastructure, cloud and CI/CD, debugging and monitoring, client collaboration, clarifying ambiguous requirements, and taking delivery responsibility while supporting the team.

Senior Fullstack Developer who builds and improves frontend and backend systems, APIs and production services; works across cloud, CI/CD and operations; advises clients on architecture and delivery; debugs, tests and maintains production-grade systems; collaborates with cross-functional teams and leads delivery efforts.

Support Public Sector business development and account work: engage clients, prepare proposals and tender materials, present sales pitches, coordinate partners/subcontractors, and grow toward leading accounts and sales over time.

As a Lead Developer, you'll oversee software development, facilitate collaboration between clients and teams, and implement new features while ensuring quality delivery in an agile environment.

As a Full Stack Developer, you will handle the full software development lifecycle, implementing features, debugging, designing architecture, and working closely with clients on technology selection.

As a Full Stack Developer, you will handle the full software development lifecycle, working on both frontend and backend, implementing features, and engaging with clients.

As a Lead Developer, you will oversee the software development lifecycle, collaborate with clients, implement features, and support team dynamics while ensuring quality delivery and agile practices.

Full Stack Developer position for implementing front-end and back-end solutions, collaborating with clients and teams, and handling software development tasks in a low-hierarchy environment.

Hands-on senior fullstack developer building and maintaining web applications, backend services, APIs and production systems. Work spans frontend, backend and infrastructure, advising clients on architecture, delivery, CI/CD and production quality while collaborating with product teams and stakeholders.