Middleware Architecture Proposal Flashcards

Project Overview and Briefing Details

• To: Architecture Lead / Developer

• From: Chrisitan Bertsch, We are 4U GmbH

• Date: September 03, 2026

• Project Duration: 6 weeks

• Availability: 34 hours/week (part-time allocation)

• Total Budget: $34\,\text{hours/week} \times 6\,\text{weeks} = 204\,\text{hours}$

• Context & Scope:

  • Development of three distinct architecture proposals for a middleware layer.

  • Greenfield initiative operating independently without needing to integrate with or consider legacy systems.

  • Designed as both a deliverable for investment planning purposes and an opportunity to build deep expertise in modern distributed systems architecture.

  • Requires significant foundational learning during Weeks 1–3.

• Key Success Criteria:

  • Clear, well-documented comparison of three architectural options.

  • Traceable coverage of all operationalized requirements across all options.

  • Recommendations backed by explicit and detailed rationale.

Operationalized Requirements & Verification Approaches

• Zero-Downtime Deployment:

  • Operational Definition: Support Blue/Green, Canary, or Rolling Update strategies during continuous 7/24 operations.

  • Verification Approach: Measure deployment time versus service interruption duration.

• Monitoring & Observability:

  • Operational Definition: Implement metrics, structured logging, and distributed tracing; define explicit alerting thresholds.

  • Verification Approach: Dashboards must be accessible; alerts must trigger on simulated failure scenarios.

• Performance:

  • Operational Definition: Define target latency (e.g., $<200\,\text{ms}$ p95) and throughput target expressed in requests per second.

  • Verification Approach: Load testing results documenting compliance with established performance targets.

• Error Handling:

  • Operational Definition: Implement retry policies, circuit breakers, and dead-letter queues.

  • Verification Approach: Simulated failure scenarios demonstrating expected system recovery behavior.

• API Definitions:

  • Operational Definition: API-first approach using OpenAPI/Swagger or gRPC; versioning strategy fully documented.

  • Verification Approach: Swagger/OpenAPI specification files placed in the repository.

• Microservices Design:

  • Operational Definition: Service decomposition boundaries defined; inter-service communication protocol specified.

  • Verification Approach: Component diagrams displaying service boundaries and dependencies.

• Caching Strategy:

  • Operational Definition: Cache layer architecture defined (including distributed cache and invalidation strategy).

  • Verification Approach: Cache hit-rate metrics and documentation of invalidation flows.

• Redundancy & High Availability (HA):

  • Operational Definition: High availability architecture with defined failover behavior.

  • Verification Approach: Disaster recovery runbook demonstrating failover procedures.

• Flexible Deployment:

  • Operational Definition: Containerized deployments with orchestration capability (Kubernetes-compatible).

  • Verification Approach: Dockerfiles and deployment manifests present in the repository.

• Version Control:

  • Operational Definition: All source code managed in Bitbucket with CI/CD pipeline integration.

  • Verification Approach: Pipeline execution logs and documented merge request workflow.

Six-Week Delivery Plan Breakdown

• Week 1 – Requirements Definition I (Total Time: 34 hours):

  • Translate business requirements into measurable technical acceptance criteria: 14 hours

  • Research fundamental concepts behind each requirement area: 12 hours

  • Prepare and conduct Sync Meeting #1 (understanding check): 4 hours

  • Document open questions and learning notes: 4 hours

  • Friday Sync #1 Focus: Confirm shared understanding of all requirements. Verify whether acceptance criteria are testable and complete.

• Week 2 – Requirements Definition II (Total Time: 34 hours):

  • Finalize and prioritize requirements using the MoSCoW method (Must/Should/Could/Won't): 12 hours

  • Derive evaluation criteria with weighting from prioritized requirements: 8 hours

  • Draft comprehensive requirements specification document: 10 hours

  • Prepare for and conduct Sync Meeting #2: 4 hours

  • Friday Sync #2 Focus: Review requirements specification. Verify if anything is missing and ensure priorities accurately reflect business value.

• Week 3 – Architecture Patterns & Technology Research (Total Time: 34 hours):

  • Research deployment strategies (Blue/Green, Canary, Rolling) and observability stacks: 8 hours

  • Investigate API styles (REST, GraphQL, gRPC) and caching architectures: 6 hours

  • Study middleware patterns (API Gateway, Message Broker, Service Mesh): 6 hours

  • Deep-dive into high availability and redundancy patterns: 4 hours

  • Prepare and conduct Sync Meeting #3: 6 hours

  • Buffer for unexpected questions or comprehension gaps: 4 hours

  • Friday Sync #3 Focus: Validate technology shortlist. Identify which patterns and tools appear most promising for the specific use case.

• Week 4 – Draft Three Proposals (Total Time: 34 hours):

  • Create initial sketches for Proposal A, Proposal B, and Proposal C (diagrams, tech stacks, requirement coverage mapping): 24 hours

  • Document trade-offs and key differences between each option: 6 hours

  • Prepare for and conduct Sync Meeting #4: 4 hours

  • Friday Sync #4 Focus: Review draft proposals. Evaluate whether any option should be eliminated or combined, and pinpoint clear distinctions.

• Week 5 – Deep Dive & Risk Assessment (Total Time: 34 hours):

  • Elaborate favored options with deployment concepts, failure modes, and scaling strategies: 16 hours

  • Provide rough effort/risk assessment per option (development, licensing, operations): 10 hours

  • Prepare for and conduct Sync Meeting #5: 4 hours

  • Buffer for unforeseen issues: 4 hours

  • Friday Sync #5 Focus: Assess feasibility of remaining options. Determine if sufficient data exists to make a final decision.

• Week 6 – Consolidation & Final Delivery (Total Time: 34 hours):

  • Build weighted comparison matrix ($\text{criteria} \times \text{options}$): 10 hours

  • Complete final documentation package (specifications, diagrams, matrices): 12 hours

  • Internal rehearsal with stakeholder review: 6 hours

  • Conduct Final Sync Meeting #6 + post-meeting revisions: 6 hours

  • Friday Sync #6 Focus: Full presentation of three proposals with top recommendation. Provide decision-ready materials.

Meeting Schedule & Communication Governance

• Sync Meeting Matrix:

  • Sync #1: Week 1 | Duration: 30 minutes | Purpose: Requirements understanding verification

  • Sync #2: Week 2 | Duration: 30 minutes | Purpose: Requirements specification approval

  • Sync #3: Week 3 | Duration: 30 minutes | Purpose: Technology pattern validation

  • Sync #4: Week 4 | Duration: 30 minutes | Purpose: Draft proposal direction check

  • Sync #5: Week 5 | Duration: 30 minutes | Purpose: Feasibility and risk review

  • Sync #6: Week 6 | Duration: 45 minutes | Purpose: Final presentation and decision

• Time Zone and Coordination Guidelines:

  • All sync meetings are scheduled for São Paulo morning hours to align with European afternoon availability.

  • Meeting agendas and blockers must be communicated weekly by Thursday EOD.

Deliverables Checklist

By the end of Week 6, the required deliverables to produce are:

• Requirements Specification Document: Fully operationalized acceptance criteria.

• Three Architecture Proposal Documents: Each capped at a maximum length of 10 pages, including diagrams.

• Comparison Matrix: Single-page weighted scoring evaluation across all options.

• Technology Stack Recommendation: Fully documented including procurement implications.

• Risk Register: Identifies the top 5 risks per option along with corresponding mitigation strategies.

• Executive Summary: A 1-page decision brief containing the top recommendation and justification.

Support & Escalation Procedures

• Mid-week Check-ins: Optional 15-minute Tuesday asynchronous update (via Slack or email) to surface blockers early.

• Technical Resources: Utilize official documentation, architectural pattern libraries, and industry case studies.

• Escalation Path: Any technical or operational blocker lasting longer than 24 hours ($>24\,\text{hours}$) must be escalated immediately without waiting for the Friday sync meeting.

Expected Decision Outcomes

Upon completion, stakeholders will have comprehensive data to select a single middleware architecture proposal based on quantified trade-offs across five core areas:

• Time-to-Market

• Total Cost of Ownership (TCO): Evaluated over a 3-year horizon.

• Scalability and Operational Resilience

• Team Capability Alignment

• Vendor Lock-in Exposure

Semana 1: Definição de Requisitos I (Carga Horária Total: $34\,\text{horas}$)

Visão Geral da Semana

O objetivo principal da primeira semana é traduzir os requisitos de negócios em critérios técnicos de aceitação mensuráveis e desenvolver o entendimento base do projeto.

Etapa 1: Pesquisa de Conceitos Fundamentais

• Carga Horária Estimada: $12\,\text{horas}$

• Foco: Entender os blocos básicos da arquitetura antes da aplicação prática.

• Micro-tarefas:

  1. Estudar estratégias de implantação contínua (Blue/Green, Canary, Rolling Updates).

  2. Pesquisar sobre observabilidade: métricas, logs estruturados e rastreamento distribuído (tracing).

  3. Revisar conceitos de desempenho (latência p95 e throughput em requisições por segundo).

  4. Analisar padrões de resiliência e tratamento de erros (retry, circuit breaker, dead-letter queue).

  5. Explorar abordagens de definição de API (OpenAPI/Swagger e gRPC).

Etapa 2: Tradução de Requisitos em Critérios de Aceitação

• Carga Horária Estimada: $14\,\text{horas}$

• Foco: Definir como cada requisito será testado e verificado em produção.

• Micro-tarefas:

  1. Zero-Downtime Deployment:

  • Estabelecer métricas para medir o tempo de deploy em relação à duração de qualquer interrupção de serviço.

  1. Monitoramento e Observabilidade:

  • Definir painéis de métricas e gatilhos de alerta para falhas simuladas.

  1. Desempenho:

  • Definir meta de latência (ex.: inferior a $200\,\text{ms}$ para p95) e carga suportada.

  1. Tratamento de Erros:

  • Desenhar cenários de simulação de falhas para testar a recuperação automática.

  1. Definições de API:

  • Garantir especificação OpenAPI/Swagger e documentação da estratégia de versionamento no repositório.

Etapa 3: Documentação de Dúvidas e Aprendizados

• Carga Horária Estimada: $4\,\text{horas}$

• Foco: Registrar lacunas de conhecimento e pontos a esclarecer.

• Micro-tarefas:

  1. Listar dúvidas sobre os requisitos técnicos para a reunião de alinhamento.

  2. Registrar notas de aprendizado sobre as tecnologias pesquisadas.

Etapa 4: Reunião de Sincronização (Sync #1)

• Carga Horária Estimada: $4\,\text{horas}$ (incluindo preparação e pós-reunião)

• Duração da Reunião: $30\,\text{minutos}$ (agendada para o período da manhã em São Paulo)

• Foco do Alinhamento: Confirmar a compreensão compartilhada de todos os requisitos. Verificar se os critérios de aceitação são mensuráveis, testáveis e completos.