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Hello! ✨

We’re Wildix, a global leader in Unified Communications & Collaboration as a Service (UCaaS) and we’re on a mission to redefine how businesses connect. Our secure, web-based and AI-powered solutions help companies around the world collaborate smarter, serve customers better and grow stronger — and we want you to help shape what’s next.

About Us…

In 2005, brothers Dimitri and Steve Osler set out to reimagine how businesses communicate, and that vision became Wildix. Today, from our headquarters in Tallinn, Estonia, Wildix is one of the world’s fastest-growing UCaaS companies, with 300+ team members from 15+ nationalities, working across Europe, the UK, the Americas and beyond. We serve businesses in 135+ countries through a partner-first ecosystem, delivering secure, intuitive solutions that keep companies connected, productive and ready for what’s next.

At Wildix, we don’t just build technology, we live it. As a remote-first company, we rely on our own platform every day to collaborate globally and innovate fast. With steady growth and a strong foundation, we offer real opportunities to advance your career as we scale, making an impact in a global team that’s shaping the future of work.

At Wildix, our mission is clear: Empower companies worldwide with seamless communication solutions that drive productivity, efficiency, and growth.

About The Role:

We are looking for a Backend Developer to join our Business Layer & Portal team. In this role, you will be a key contributor to our core business platform, managing critical integrations and services. This is a polyglot, AWS-heavy environment where your code will orchestrate workflows between Wildix cloud infrastructure and major business systems (SAP, Salesforce, Stripe, etc.). If you love serverless architectures, solving complex business logic, and working with both PHP and Go, you’ll fit right in.

Are you up for the challenge?

What You Will:

• Develop and support core application services: Build, test, and debug backend features.
• Integrate with enterprise platforms: Build and maintain secure integrations with Salesforce, SAP B1 Service Layer, payment processors (Stripe), and tax/VAT engines (SureTax).
• Work on Serverless AWS infrastructure: Develop and deploy serverless event-driven applications on AWS using AWS Lambda, API Gateway, SQS, Route53, and AppConfig.
• Optimize Performance & Security: Enhance API latency, build robust caching strategies with Redis/ElastiCache, and protect system integrity through secure token-based and scope-based authorization.
• Collaborate cross-functionally: Work closely with Customer Care, SAP, CRM, SRE, Sales, Marketing, CLASSOUND, and Accounting teams to build requested features and troubleshoot integration bottlenecks.
• Maintain documentation: Write and update API specifications and system design diagrams for seamless team collaboration.
   

What You Will Bring:

• 2+ years of professional backend development experience, with solid proficiency in PHP 8.x and/or Go (Golang).
• Practical experience building applications on AWS (AWS Lambda, SQS, API Gateway) and utilizing Infrastructure as Code (AWS SAM).
• Strong SQL skills (MySQL, MSSQL / SQL Server) and a solid understanding of cache-first patterns (Redis, Memcached).
• Proven track record of designing, testing, and debugging third-party API integrations (CRM, payment gateways, ERP systems, external web services).
• Experience in writing clean, testable code with robust unit/integration testing (PHPUnit, Go testing).
• Upper-Intermediate English skills (B2+) for daily collaboration in our international team.
   

Bonus Points If:

• Experience with Bref (PHP on AWS Lambda) and modern PHP API design (PHP-DI, FastRoute, Harmony/Laminas middleware).
• Direct experience with SAP B1 Service Layer, Salesforce REST API, or automated tax calculation services.
   

Why You’ll Love It Here

👫 Work with a Supportive, High-Performing Team – We believe in trust, autonomy, and working with bright, passionate individuals who drive real impact.

🌍 A Truly International Workplace – Our diverse and inclusive team ensures you’ll always feel connected and supported, no matter where you are.

🚀 Shape the Future of Global Communication – Be part of a team transforming how businesses operate in an era of remote work and AI-powered collaboration.

💼 Join a Profitable & Stable Company – We’re not a startup experiment, we’re a two decade old success story with sustained profitability, meaning we can back your boldest ideas.

What we offer

🏖️ Generous Time Off – Take the breaks you need to relax, recharge, and come back inspired.

💻 Top-Tier Tech – Love Mac? So do we! We equip our team with the best tools for success.

🚀 Career Growth & Development – Access to programs and events to keep you at the top of your game.

🌱 Well-being Support – We offer access to psychology sessions to support your mental and emotional health

Happy with them? We offer even more! Our Benefits are country-specific, you can ask your recruiter for more information

Interview Process

🤝 Step 1: Initial Screening – A chat with our Talent Team to understand your background, experience, and motivations (30 mins)
🛠️ Step 2: Final Tech Interview – A conversation with Team Lead and an SRE to ensure alignment with our values and mission (60 mins)

We Are Wildix

Wildix is an equal-opportunity employer. We value diversity and welcome all applicants regardless of race, gender, age, religion, or any other characteristic. Everyone is encouraged to apply and is welcome to join our Blue Ecosystem. 

Ready to join us? Apply Now!

Job Title:

Block-Builder Engineer

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.

About the Product:

An advanced block construction platform operating on the Ethereum mainnet that processes order flow, transaction bundles, and submits finalized blocks through relay networks in real time. It addresses neutral and efficient block building to unlock new decentralized finance capabilities, including intrablock lending and execution extensions. The system handles high-throughput data pipelines and strict latency requirements, backed by comprehensive observability and analytics to drive iterative improvements based on live production metrics. Strong engineers are essential to maintain system health under real-time load, verify data-driven hypotheses, and innovate on core protocol logic.

About the Role:

The Block-Builder Engineer will join an experienced team in Kraków or Warsaw to develop and maintain a next-generation Ethereum block construction system. You will own pipeline components that ingest order flow and transaction bundles, manage relay submission paths, and ensure stable performance under real-time load. Your work will include building and refining observability platforms, conducting controlled A/B experiments, and driving reliability improvements such as panic mitigation and latency regression detection. As you ramp, you will contribute to optimization-driven block building logic, on-chain intrablock lending protocols, and an execution extension, gaining autonomy and deep technical ownership across the core stack.

Key Responsibilities:

- Integrate and process order-flow ingestion, bundle and transaction handling, back-pressure management, and reintegration of data for block inputs.

- Develop and maintain relay submission paths to ensure end-to-end block delivery under production load.

- Build and enhance telemetry and dashboards using Grafana, Prometheus, Loki and SQL to provide trusted observability.

- Diagnose and correct measurement issues—broken counters, misleading dashboards, and erroneous denominators—to maintain metric accuracy.

- Design, execute and analyze controlled A/B experiments in production, reporting findings objectively, including inconclusive results.

- Identify and resolve system panics, dropped messages, and latency regressions, with automated tests to prevent recurrence.

- Optimize data pipelines and processing systems for high-throughput, low-latency performance.

- Contribute to the development of intrablock lending protocols and associated trusted-execution components.

- Collaborate on an execution extension (BEX) and future protocol and exchange-layer enhancements.

Required Competence and Skills:

- 2–4 years of professional software engineering experience shipping and operating production systems.

- Minimum 2 years working on Ethereum or other EVM-compatible blockchains.

- Proficiency in Rust or strong systems experience in Go, C++ or Java with eagerness to adopt Rust.

- Solid understanding of concurrent and real-time code within large, existing codebases.

- Strong SQL skills and practical experience with Python for data analysis and tooling.

- Familiarity with monitoring and analytics tooling and a drive to ensure metric correctness.

- Rigorous engineering habits, including comprehensive testing and clear distinction between verified and assumed behavior.

- Data-driven mindset with a habit of querying logs and databases to validate change impact.

Nice to Have:

- Exposure to Ethereum block-building protocols (PBS/MEV), smart contract interactions, or trading systems.

- Experience with high-throughput data pipelines, time-series databases, or large-scale analytics.

- Familiarity with Ethereum client internals (reth, geth, revm) or deploying services on Kubernetes and Docker.

Why Us:

We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).

We provide full accounting and legal support in all countries we operate.

We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.

We offer a highly competitive package with yearly performance and compensation reviews.