Senior Software Engineer — AI-First Full-Stack

Vitec Tietomitta Oy; Helsinki; Hybrid; EUR 120,000 - 180,000; Full time

Job summary

Vitec Tietomitta Oy is seeking a senior software engineer in Helsinki to shape architecture, product decisions, and hands-on delivery. The role blends independent architectural work with hands-on coding in Python and TypeScript/React, leveraging AI agents for implementation while you provide critical review and judgment.

The ideal candidate has 10+ years of production software experience across backend and frontend, extensive SaaS multi-tenant exposure, and strong English communication.

Qualifications

• Senior-level (10+ years) shipping production software end-to-end, backend and frontend.
• Experience delivering multi-tenant SaaS at scale with releases and migrations.
• Fluent, daily use of AI coding agents; review of agent output.
• Strong architectural understanding and ability to justify design decisions independently.
• Proactive, customer-driven product behavior and stakeholder engagement.
• Hands-on proficiency in Python and TypeScript/React in a full-stack stack.
• Fluent English as working language.

Skills

Senior level 10+ years

Multi-tenant SaaS at scale

AI coding agents use

Architectural understanding

Customer-driven product behavior

Python and TypeScript/React

Fluent English

Job description

At Vitec Tietomitta, we're looking for a senior software engineer. The role is deliberately broad — architecture, product decisions, and hands-on delivery — on a small senior team where AI agents do a large share of the implementation and your judgment does the rest. Judgment is what we're really hiring for — it's the part we can't teach. We also require genuine hands‑on fluency in Python and TypeScript/React: the agent won't always get it right, and you need to recognize when it hasn't.

Must-have

• Senior-level (10+ years) shipping production software end-to-end, backend and frontend — you've owned systems, not tickets
• Genuine experience delivering multi-tenant SaaS at scale — you've run software in production for many customers and lived with what that brings: releases and migrations without downtime, performance under real load, per-customer configuration, and monitoring
• Fluent, daily use of AI coding agents (Claude Code, Cursor, Copilot or similar) — you delegate implementation, review the output critically, and recognize when the agent is confidently wrong
• Strong architectural understanding — system boundaries, data flow, integration patterns, and the trade-offs between them; able to justify a design, make the call independently, and revisit it when reality disagrees. This is not a ticket‑factory role.
• Proactive, customer-driven product behavior — you engage directly with stakeholders and end users if needed, challenge requirements that don't hold up, and optimize for the outcome rather than the ticket
• Hands-on proficiency in Python and TypeScript/React — this is our stack. When the agent stalls or produces something subtly wrong, you need to read and fix the code yourself.
• Fluent English — the working language of the engineering team; codebase and documentation are in English

Things we'd like, but are not a must

• Depth in our specific frameworks — FastAPI, Next.js (app router, server components), PostgreSQL.
• Disciplined separation of data access from business logic — data sources sit behind a clean interface (repository pattern or equivalent), so code can be tested and data sources swapped without a rewrite
• Relational database and data‑modelling skills — complex SQL, performance tuning, sensible schema design
• Experience with data‑heavy application UX — grids, filters, aggregations, export
• Domain experience in a regulated, reporting‑heavy industry — environmental, energy, logistics or similar
• Finnish — a strong plus, but not required; the wider company still operates largely in Finnish, so it helps with domain terminology and stakeholder conversations

Why This Is an Interesting Job

• Breadth of real engineering problems — the work spans product features, data plumbing, and architecture across an established SaaS platform. Expect variety rather than one narrow lane.
• Real impact — you work on software that paying customers use every day, close enough to the business to see what your decisions actually change.
• Domain depth — you go deep on a real business domain instead of skimming a series of tickets. If you like understanding how a business actually works before writing code, that's the mode here.
• AI-first workflow — AI writes most of the implementation. Your job is architecture, domain decisions, context/prompt design, and rigorous review — not typing boilerplate. If you already work this way, you'll be at home; if you don't, this isn't the job.

Why Join

• Circular-economy impact — software that keeps real operational systems running for waste and recycling customers
• Pragmatic engineering culture — long‑term quality over short‑term delivery pressure
• Senior team — a small group of experienced engineers who value ownership and practical solutions

Working Model

• Direct access to the CTO — for architectural decisions and domain questions
• Proactive by default — you're expected to surface risks early, propose alternatives, talk to customers where it speeds up a decision, and take calls rather than wait for them
• Established engineering practice — existing CI/CD pipeline, code review process, and branching conventions
• Hybrid — approximately 3 days per week at the office
• Office in Pasila, Helsinki — about a 10‑minute walk from Pasila train station
• Start immediately — onboarding is ready as soon as you are

About the Business Unit: Vitec Tietomitta

Tietomitta delivers innovative software solutions for the waste management and circular economy industry. Our systems provide customers with tools to improve efficiency and meet regulatory requirements—helping them work smarter and more sustainably.

About Vitec Software Group

Vitec is a leading provider of Vertical Software and has its origin and headquarters in Umeå, Sweden. Our products have been developed to meet specific needs within various niche markets in society. The expertise of our employees, combined with our shared corporate culture and business model, enable continuous improvement and innovation. We grow through the successes of our business units, as well as through acquisitions. Everything we do is based on a long‑term perspective. Because we are to rely on – today and tomorrow. Vitec has 1,870 employees, is listed on Nasdaq Stockholm and had net sales of SEK 3,633 million in 2025. Read more at vitecsoftware.com.