{"id":2979028,"url":"https://alion.io/job/supercharge-senior-javakotlin-engineer-freelancer-2","title":"Senior Java/Kotlin Engineer (Freelancer)","company":{"id":4381084,"name":"Supercharge","domain":"supercharge.com","url":"https://alion.io/company/supercharge-4","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"freelance","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Hungary"],"countries":["HU"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":47000,"max_usd":84000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":18},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"Grafana","optional":false},{"name":"Java","optional":false},{"name":"Kotlin","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Redis","optional":false},{"name":"Spring Boot","optional":false},{"name":"SQL","optional":false},{"name":"Terraform","optional":false}],"status":"live","first_seen_at":"2026-10-21T00:00:00Z","employer_posted_date":null,"last_verified_at":"2026-10-21T00:00:00Z","board_verified":false,"closed_at":null,"days_open":3,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":3},"description":"Task\nSupporting the development of a stable and scalable Kotlin and Spring Boot back-end from the ground upCrafting code that adheres to the highest industry standards while ensuring seamless integration with our Cl toolsCollaborating effectively within a dynamic team environment on exciting, cutting-edge tech initiatives while working closely with fellow engineers and supporting Tech Leads and ArchitectsBringing an architectural perspective to the planning processExpectation\n3+ years of experience in Java ecosystemFamiliarity with Java 17, 21Deep understanding of Spring BootExperience with an observability platform (Grafana / LGTM or ELK stack or NewRelic)Proven ability to troubleshoot under pressure, quickly identify root causes, recommend impactful solutions, and ensure thorough follow-throughHands-on experience with SQL or NoSQL databases (Postgres, Redis)Experience with KubernetesFamiliarity with at least one public cloud provider (preferably AWS)A strong OOP mindset and a commitment to upholding SOLID principlesA passion for writing clean, maintainable code, adhering to best practicesAt least an intermediate level of English language skillsOther\nFamiliarity with IaC, such as Terraform, HelmKotlin experienceWhat we offer\nFull-time (40 hours/week) contract for approximately 3 monthsOn-site presence required once a week at Budapest officeHigh-quality engineering environment focused on clean code and modern technologiesStrong team and friendly atmosphereCompany details:\nSupercharge is one of the fastest-growing tech companies globally, according to Financial Times (FT1000) and Deloitte (EMEA Fast500). Our in-house team of over 200 digital experts across our European and North American offices are passionately united in the pursuit of discovering and building better futures. We cut through business, tech and regulatory complexity and fuse Behavior Science-based design and unique data & AI-focused technical competence to propel your business. We believe that innovation is a team effort: our strategists, designers, developers and engineers work shoulder to shoulder to enable what yesterday was still impossible. Budapest is where it all started for Supercharge - this is our headquarters and the beating heart of our company. We have local offices in several countries, but this is where the real magic happens. A buzzing, vibrant space filled with talented individuals dreaming up and delivering amazing products for our clients. This Office of the Year award-winning space is home to our legendary after-work events, and as located in the heart of the city, putting us just steps away from some of the best restaurants, cafes, and bars around.","description_format":"text","description_chars":2681,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Commerce","Gift Cards & Loyalty Programs","Coupons, Deals & Cashbacks"],"lifecycle":[{"event":"open","at":"2026-10-21T05:50:50Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":3,"expected_fill_days":28,"reasons":["seen:3","velocity","win:early"],"computed_at":"2026-10-24T06:02:35Z"},"pay":null,"html_url":"https://alion.io/job/supercharge-senior-javakotlin-engineer-freelancer-2","json_url":"https://alion.io/job/supercharge-senior-javakotlin-engineer-freelancer-2.json","meta":{"generated_at":"2026-10-24T07:05:22Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":10485,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-25T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":4381084},"rest":"https://alion.io/mcp/rest/get_company?id=4381084"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fsupercharge-senior-javakotlin-engineer-freelancer-2"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fsupercharge-senior-javakotlin-engineer-freelancer-2"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fsupercharge-senior-javakotlin-engineer-freelancer-2"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/supercharge-senior-javakotlin-engineer-freelancer-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fsupercharge-senior-javakotlin-engineer-freelancer-2"}]}