At Sweet Mustard, we build custom digital products that solve real business challenges for ambitious companies.
As a Software Architect, you design the backbone of those solutions. You translate business goals into solid architectures, guide our teams in making the right technical decisions and keep an eye on quality, scalability and long‑term maintainability.
You feel at home in technical discussions with developers, but you’re just as comfortable explaining trade‑offs to business stakeholders and supporting our commercial conversations when it matters.
Responsibilities
Shape scalable, future‑proof solutions
Translate business needs into high‑level architectures for web and mobile applications: domains, components, integrations, data flows, security.
Define technical standards and guidelines (APIs, patterns, best practices) and help teams apply them consistently.
Assess existing landscapes and propose improvements or modernisation paths that balance impact, risk and cost.
Help estimate effort and planning together with project managers and service development leads.
Guide teams & delivery
Support development teams throughout the project: challenging designs, reviewing key decisions and unblocking complex issues.
Stay close to the teams, joining their reviews and workshops, so you have a clear view on how things are progressing.
Guard the coherence of the architecture during delivery: are we still building what we designed, and does it still match what the client needs?
Facilitate a smooth handover between phases (from discovery to delivery, from MVP to next iterations) by clarifying scope, risks and technical implications.
Promote code quality, performance and security by setting expectations and reviewing critical parts where needed.
Support presales & client conversations
Join client visits and discovery workshops to understand context, constraints and the real problem behind the question.
Help shape solution approaches, scope and phasing for proposals, together with Sales, Project Management and Product.
Answer technical and architectural questions during presales and help build trust in our approach.
Contribute to quotations, proposals and RFP responses where a clear technical story is needed – without losing the business angle.
Contribute to Sweet Mustard’s growth
Share best practices around architecture, tooling and ways of working with colleagues.
Help refine our service offering and technical vision based on what you see in projects and in the market.
Be an ambassador for engineering excellence within Sweet Mustard and towards our clients.
Qualifications
Several years of experience in custom software / digital products, in roles like Software Architect, Tech Lead, Senior Engineer or similar.
A solid technical background:
Well versed in the Java ecosystem (JDK, Hibernate/JPA, Spring and Spring boot).
Experience with cloud platforms and with clean architecture, layered architecture and Domain Driven Design.
Knowledge of Event‑Driven Architecture is a plus.
Proven experience in guiding teams: you’ve helped others make good technical decisions and coached them when things got complex.
Experience with presales or client‑facing technical work is a plus: workshops, technical input for proposals, answering questions in meetings.
Strong analytical and conceptual skills: you’re good at structuring complex contexts into clear models, diagrams and choices.
You’re a clear and confident communicator:
You explain technical trade‑offs in plain language.
You adapt your message to both technical and non‑technical stakeholders.
A healthy bit of commercial awareness: you understand how technical choices impact cost, risk and business value.
Comfortable working in multidisciplinary teams with business, design and technology profiles.
You communicate clearly in Dutch and English; French is a plus.
You like the consultancy vibe: switching between clients and sectors, but with Kortrijk and the Sweet Mustard community as your base.
Benefits
A competitive salary and benefits package.
Impactful, varied work: from early solution design and technical strategy to seeing real systems go live at well‑known Belgian and international clients.
Balanced teams with expertise in business, design and technology – you’re never alone in front of the customer.
A culture of co‑creation and transparency, both with clients and internally. You’ll have plenty of room to help shape how we approach architecture and delivery.
An inspiring community of “Sweeties” that loves sharing knowledge, organising initiatives and helping each other grow.
A modern office at De Kade in Kortrijk, with daylight, good coffee and free lunch sandwiches – even with sweet mustard, if that’s your thing.
Flexible hours and the option to work from home part of the week.
Apply now and help us design and deliver digital solutions that really move our clients forward.
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