Senior Software Engineer

Jonas Software; Tampere; On-site; EUR 105,000 - 158,000; Full time

Job summary

Jonas Software is seeking a Senior Software Engineer to own the design and delivery of production AI capabilities across a broad portfolio of software businesses. You will work with product and engineering leaders to translate challenges into reliable, scalable AI solutions and shape reusable patterns for organization-wide AI adoption.

This role offers high autonomy across diverse environments, evolving from legacy to cloud systems, and the opportunity to influence Jonas’s emerging AI strategy

Qualifications

• 5+ years of experience building and operating production software systems.
• Experience designing and integrating APIs, working with databases, and developing distributed systems.
• Exposure to AI/LLM-based systems and AI integration in production environments.
• Ability to work across backend, frontend, cloud, and AI integrations.
• Clear communication with both technical and non-technical stakeholders.

Responsibilities

• Lead discovery with business units to understand workflows and translate needs into technical designs.
• Design and build AI-enabled systems and full-stack components including APIs, data pipelines, and user interfaces.
• Deliver end-to-end implementations from prototype to production deployment with measurable business impact.
• Implement modernization upgrades to enable AI integration across legacy and modern platforms.
• Monitor and optimize AI features for performance, latency, and cost.

Skills

Production software experience

API design

LLM integration

Full-stack

Communication

Ownership mindset

Cloud infrastructure

Job description

Job Description:

Senior Software Engineer (AI Integration & Modernization)

Jonas Software

NOTE:

We are hiring a Senior Software Engineer to own the design and delivery of production AI capabilities across a broad portfolio of software businesses. You will work directly with product and engineering leaders, quickly understand their challenges, and build solutions that deliver real, measurable impact. This is a hands‑on, high‑autonomy role where you will move across diverse technical environments, bring modern capabilities into legacy and cloud systems, and turn complex problems into reliable, scalable software. You will also shape reusable patterns and technical approaches that will guide how AI is adopted across the organization.

This role is designed for someone who wants true ownership, thrives on variety, and is motivated by solving hard problems that matter. If you are looking for the rare opportunity to influence direction, build high‑impact systems, and become a foundational technical leader in Jonas’s emerging AI strategy, this role offers exactly that.

THE COMPANY

Jonas Software is the leading provider of enterprise management software solutions to over 40 different vertical markets. Within these vertical markets, Jonas has acquired over 185 unique and innovative companies. Jonas’ vision is to be the branded global leader across the 40+ vertical markets and to be recognized by customers and respective industry stakeholders as the trusted provider of ‘Software for Life’ and as an ambassador for technology, product innovation, quality, and customer service. Jonas Software is the valued technology partner of over 40,000 customers worldwide in more than 30 countries. Jonas employs over 6,000 skilled individuals consisting of a cross-section of industry experts and technology professionals. Jonas is headquartered in Canada and also operates offices throughout North America, the United Kingdom, Europe, Australia, South America and Africa. Jonas is a 100% owned subsidiary of Constellation Software Inc., headquartered in Toronto and traded on the TSX (CSU.TO).

POSITION

We are hiring a Senior Software Engineer to own the design and delivery of production AI capabilities across a broad portfolio of software businesses. You will work directly with product and engineering leaders, quickly understand their challenges, and build solutions that deliver real, measurable impact. This is a hands‑on, high‑autonomy role where you will move across diverse technical environments, bring modern capabilities into legacy and cloud systems, and turn complex problems into reliable, scalable software. You will also shape reusable patterns and technical approaches that will guide how AI is adopted across the organization.

This role is designed for someone who wants true ownership, thrives on variety, and is motivated by solving hard problems that matter. If you are looking for the rare opportunity to influence direction, build high‑impact systems, and become a foundational technical leader in Jonas’s emerging AI strategy, this role offers exactly that.

JOB RESPONSIBILITIES:

• Lead discovery with business units to understand workflows, identify high-value opportunities, and translate needs into clear technical solution designs.
• Design and build AI-enabled systems and full-stack components including APIs, integrations, data pipelines, retrieval systems, and user-facing interfaces.
• Deliver end-to-end implementations from prototype through production deployment, ensuring successful rollout, user adoption, and measurable business impact.
• Implement modernization upgrades such as API layers, authentication improvements, async processing, and cloud services to enable AI integration across diverse legacy and modern platforms.
• Diagnose, evaluate, and optimize AI features and supporting systems by monitoring performance, accuracy, latency, reliability, and cost efficiency.
• Build solutions that integrate deeply with existing BU systems including SaaS products, on-prem platforms, ERPs, and CRMs, resolving complex issues across back-end services, data flows, and LLM operations.
• Turn one-off solutions into reusable components, templates, and patterns that make it easier to roll out AI capabilities across additional business units.
• Help develop playbooks and provide training to enable Business Units to take ownership of AI solutions before moving on to new projects.

JOB QUALIFICATIONS:

• 5+ years of experience building and operating production software systems.
• Experience designing and integrating APIs, working with databases, and developing distributed systems.
• Exposure to AI/LLM-based systems such as prompt orchestration, retrieval-augmented workflows, embeddings, or similar production use cases.
• Ability to work across the full stack: backend services, front-end components, cloud infrastructure, and AI integrations.
• Clear communication skills and comfort working directly with both technical and non-technical stakeholders.
• Strong ownership mindset with the ability to deliver practical solutions quickly and iterate based on feedback.
• Interest in working across varied technical environments, from modern cloud systems to legacy applications.
• Comfort and experience leveraging AI coding agents in SDLC across both greenfield and brownfield contexts.

Business Unit:

Corporate USA

Scheduled Weekly Hours:

37.5

Number of Openings Available:

1

Worker Type:

Regular

More About Jonas Software:

Jonas Software is a leading provider of enterprise management software solutions, serving a wide range of vertical markets including hospitality, healthcare, construction, education, personal care, fitness, leisure, moving and legal services, to name a few. Within these markets, Jonas is comprised of over 65 distinct brands, each a respected leader in its domain.

Jonas’ vision is to be the branded global leader across these verticals and to be recognized by customers and industry stakeholders as the trusted provider of “Software for Life.” We are committed to technology, product innovation, quality, and exceptional customer service.

Jonas Software supports over 60,000 customers in more than 30 countries. We employ over 6,000 skilled professionals, including industry experts and technology specialists. Across our broader network, we support a global workforce of more than 30,000 employees.

Headquartered in Canada, Jonas Software has a global footprint with offices around the world. We’re a 100% owned subsidiary of Constellation Software Inc., based in Toronto, publicly listed on the TSX (CSU.TO), and a member of the S&P/TSX 60 Index.