Senior Software Engineer - Fullstack

UJET; Porto; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Impactful Work

Dynamic Culture

Job summary

UJET in Porto, Portugal, is seeking a Senior Software Engineer (Fullstack) to own complex epics across frontend and backend, mentor junior engineers, and drive AI-driven development with high-quality code.

You will design scalable fullstack features, collaborate with product, design, QA, and SRE, participate in on-call rotations, and help modernize legacy systems while maintaining security and performance.

Qualifications

• 5+ years of software development with fullstack ownership of complex epics or features.
• Strong knowledge of modern distributed computing and performance reasoning.
• Experience with microservice architectures and diverse datastores (MySQL, NoSQL, Redis, Elasticsearch).

Responsibilities

• Own epics and deliver features across frontend and backend from design through deployment.
• Define timelines, resources, and risks; break epics into tickets.
• Mentor L1/L2 engineers and contribute to onboarding and architecture reviews.
• Design scalable, high-availability fullstack features and services.
• Participate in on-call rotations and postmortems to improve reliability.

Skills

Fullstack experience

Epic ownership

Distributed computing

Microservices

AI-driven development

Mentoring

Education

Bachelor's Degree in Computer Science

Tools

Git

Docker

CI/CD

12factor

Job description

UJET leads the way in AI-powered contact center innovation, delivering a future-proof, cloud platform that redefines the customer experience with cutting-edge AI, true multimodality, and a mobile-first approach. We infuse AI across every aspect of your customer journey and contact center operations, to drive automation and efficiency. UJET's AI solutions empower agents, optimize customer journeys, and transform contact center operations for elevated experiences and actionable insights. Built on a cloud-native architecture with a unique CRM-first approach, UJET ensures unmatched security, scalability, and prioritized data insights (without storing PII). Designed for effortless use, UJET partners with businesses to deliver exceptional interactions, smarter decision-making, and accelerated growth in the AI-driven world.

UJET is searching for a Senior Software Engineer (Fullstack) to join our growing team! The ideal candidate is an experienced fullstack engineer who owns epics and features of significant complexity end-to-end across the frontend and backend, and who is meticulous with code style and quality. As a Senior engineer, you will define and execute against timelines, resources, and other constraints, break epics down into tickets, and mentor our L1 and L2 engineers. You are a strong practitioner of AI-driven development - using AI coding tools and agents to accelerate your own delivery while upholding our quality bar.

Responsibilities

• Own epics and deliver features, services, and refactors of significant complexity across product software engineering - from ticket breakdown through deployment and post-release validation
• Define and execute against timelines, resources, and other constraints, flagging risks and trade-offs early
• Break down epics into well-scoped tickets and sequence the work with your team
• Become the SME for one or more areas of your team's domain and a dependable go-to person within the team
• Design and build fullstack features and services with high availability, low latency, and auto scalability
• Author and review technical design documents (TDDs); design service boundaries, data models, and APIs balancing simplicity, performance, and extensibility
• Partner with PM, Design, QA, PMO, and SRE through the full software development lifecycle, participating in planning, estimation, and prioritization
• Write idiomatic, well-tested code and provide thoughtful code reviews that uphold engineering standards across the codebase
• Build and maintain unit, integration, and contract tests; instrument logging, metrics, and tracing so systems are observable in production
• Participate in the on-call rotation; triage, mitigate, and document production incidents and drive follow-up actions from postmortems
• Identify and pay down technical debt, modernizing legacy code to protect long-term maintainability
• Use AI coding assistants and agentic workflows to accelerate delivery, applying our team guardrails and quality standards to anything they produce
• Mentor L1 and L2 engineers, contribute to onboarding docs, and share knowledge through brown-bags, internal talks, and architecture reviews
• Communicate openly and transparently, and raise the quality of bug tracking and reporting within your team

Requirements

• 5+ years' experience in software development, with solid fullstack (frontend and backend) development experience and a track record of owning epics or features of significant complexity
• You have strong foundational knowledge of modern, distributed computing.
• You understand the performance characteristics of the services you own and can reason about them quantitatively.
• Working experience around a breadth of datastores including MySQL, NoSQL, Redis or Elasticsearch
• Efficiency in software best practice and tools like Git, Docker, CI, 12factor, etc
• Experience working within a microservice architecture
• Capable of writing optimal code across the stack, including at least one backend language (Java, Go, Ruby, Python) and a modern frontend framework (e.g., React, Angular)
• Hands-on proficiency with AI-driven development - AI coding assistants and agentic workflows (e.g., Claude, Copilot, Cursor) - with the judgment to apply them effectively while upholding code quality
• Experience mentoring less experienced engineers and collaborating cross-functionally in a fast-paced environment
• Bachelor's Degree in Computer Science or equivalent experience

Please note that this position requires 2 days worked in office in Porto, Portugal weekly.

*A candidate's actual placement within this range will depend on geographic location, work experience, education, and/or skill level.

Why UJET?

• Impactful Work: Be at the forefront of innovation, directly shaping the future of customer experience.
• Dynamic Culture: Join a collaborative, inclusive team that values big ideas, creative solutions, and powerful relationships.

UJET is an Equal Opportunity Employer

UJET provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.

Compliance Responsibilities

Security, data protection and compliance (SDPC) are paramount to the success of our partnerships. All roles at UJET require compliance with legal and regulatory requirements and acceptance and adherence to all policies and standards within UJET. Personnel acknowledges they are personally responsible for reporting any suspected violations or abuse and are required to complete SDPC training and fulfill role-specific SDPC responsibilities.

AI Use in Our Hiring Process

UJET uses artificial intelligence (AI) technology to assist with the initial review and filtering of job applications against the qualifications listed in this posting. AI does not make hiring decisions, does not conduct interviews, and has no authority to reject or advance a candidate on its own. All application review decisions, candidate screening, and interviews are conducted by members of our human recruiting and hiring teams.

Reasonable Accommodation

If you would like to request a reasonable accommodation as part of the application process, including an alternative to AI-assisted screening, please contact [e-mail] .

Work Authorization & Sponsorship

Applicants must be legally authorized to work in the country in which this position is located, without the need for current or future employer-sponsored visa sponsorship. UJET does not sponsor employment visas for this role.